diff --git a/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/SpeechToText.java b/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/SpeechToText.java
index 55aa1febf0..f6fccac6c0 100644
--- a/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/SpeechToText.java
+++ b/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/SpeechToText.java
@@ -1,5 +1,5 @@
 /*
- * (C) Copyright IBM Corp. 2016, 2024.
+ * (C) Copyright IBM Corp. 2024.
  *
  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
  * the License. You may obtain a copy of the License at
@@ -113,8 +113,8 @@
  *
  * <p>Effective **31 July 2023**, all previous-generation models will be removed from the service
  * and the documentation. Most previous-generation models were deprecated on 15 March 2022. You must
- * migrate to the equivalent next-generation model by 31 July 2023. For more information, see
- * [Migrating to next-generation
+ * migrate to the equivalent large speech model or next-generation model by 31 July 2023. For more
+ * information, see [Migrating to large speech
  * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-models-migrate).{:
  * deprecated}
  *
@@ -372,31 +372,37 @@ public ServiceCall<SpeechModel> getModel(GetModelOptions getModelOptions) {
    * <p>**See also:** [Supported audio
    * formats](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-audio-formats).
    *
-   * <p>### Next-generation models
+   * <p>### Large speech models and Next-generation models
    *
-   * <p>The service supports next-generation `Multimedia` (16 kHz) and `Telephony` (8 kHz) models
-   * for many languages. Next-generation models have higher throughput than the service's previous
-   * generation of `Broadband` and `Narrowband` models. When you use next-generation models, the
-   * service can return transcriptions more quickly and also provide noticeably better transcription
-   * accuracy.
+   * <p>The service supports large speech models and next-generation `Multimedia` (16 kHz) and
+   * `Telephony` (8 kHz) models for many languages. Large speech models and next-generation models
+   * have higher throughput than the service's previous generation of `Broadband` and `Narrowband`
+   * models. When you use large speech models and next-generation models, the service can return
+   * transcriptions more quickly and also provide noticeably better transcription accuracy.
    *
-   * <p>You specify a next-generation model by using the `model` query parameter, as you do a
-   * previous-generation model. Most next-generation models support the `low_latency` parameter, and
-   * all next-generation models support the `character_insertion_bias` parameter. These parameters
-   * are not available with previous-generation models.
+   * <p>You specify a large speech model or next-generation model by using the `model` query
+   * parameter, as you do a previous-generation model. Only the next-generation models support the
+   * `low_latency` parameter, and all large speech models and next-generation models support the
+   * `character_insertion_bias` parameter. These parameters are not available with
+   * previous-generation models.
    *
-   * <p>Next-generation models do not support all of the speech recognition parameters that are
-   * available for use with previous-generation models. Next-generation models do not support the
-   * following parameters: * `acoustic_customization_id` * `keywords` and `keywords_threshold` *
-   * `processing_metrics` and `processing_metrics_interval` * `word_alternatives_threshold`
+   * <p>Large speech models and next-generation models do not support all of the speech recognition
+   * parameters that are available for use with previous-generation models. Next-generation models
+   * do not support the following parameters: * `acoustic_customization_id` * `keywords` and
+   * `keywords_threshold` * `processing_metrics` and `processing_metrics_interval` *
+   * `word_alternatives_threshold`
    *
    * <p>**Important:** Effective **31 July 2023**, all previous-generation models will be removed
    * from the service and the documentation. Most previous-generation models were deprecated on 15
-   * March 2022. You must migrate to the equivalent next-generation model by 31 July 2023. For more
-   * information, see [Migrating to next-generation
+   * March 2022. You must migrate to the equivalent large speech model or next-generation model by
+   * 31 July 2023. For more information, see [Migrating to large speech
    * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-models-migrate).
    *
-   * <p>**See also:** * [Next-generation languages and
+   * <p>**See also:** * [Large speech languages and
+   * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-models-large-speech-languages)
+   * * [Supported features for large speech
+   * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-models-large-speech-languages#models-lsm-supported-features)
+   * * [Next-generation languages and
    * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-models-ng) * [Supported
    * features for next-generation
    * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-models-ng#models-ng-features)
@@ -439,6 +445,9 @@ public ServiceCall<SpeechRecognitionResults> recognize(RecognizeOptions recogniz
     if (recognizeOptions.model() != null) {
       builder.query("model", String.valueOf(recognizeOptions.model()));
     }
+    if (recognizeOptions.speechBeginEvent() != null) {
+      builder.query("speech_begin_event", String.valueOf(recognizeOptions.speechBeginEvent()));
+    }
     if (recognizeOptions.languageCustomizationId() != null) {
       builder.query(
           "language_customization_id", String.valueOf(recognizeOptions.languageCustomizationId()));
@@ -699,31 +708,37 @@ public ServiceCall<Void> unregisterCallback(UnregisterCallbackOptions unregister
    * <p>**See also:** [Supported audio
    * formats](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-audio-formats).
    *
-   * <p>### Next-generation models
+   * <p>### Large speech models and Next-generation models
    *
-   * <p>The service supports next-generation `Multimedia` (16 kHz) and `Telephony` (8 kHz) models
-   * for many languages. Next-generation models have higher throughput than the service's previous
-   * generation of `Broadband` and `Narrowband` models. When you use next-generation models, the
-   * service can return transcriptions more quickly and also provide noticeably better transcription
-   * accuracy.
+   * <p>The service supports large speech models and next-generation `Multimedia` (16 kHz) and
+   * `Telephony` (8 kHz) models for many languages. Large speech models and next-generation models
+   * have higher throughput than the service's previous generation of `Broadband` and `Narrowband`
+   * models. When you use large speech models and next-generation models, the service can return
+   * transcriptions more quickly and also provide noticeably better transcription accuracy.
    *
-   * <p>You specify a next-generation model by using the `model` query parameter, as you do a
-   * previous-generation model. Most next-generation models support the `low_latency` parameter, and
-   * all next-generation models support the `character_insertion_bias` parameter. These parameters
-   * are not available with previous-generation models.
+   * <p>You specify a large speech model or next-generation model by using the `model` query
+   * parameter, as you do a previous-generation model. Only the next-generation models support the
+   * `low_latency` parameter, and all large speech models and next-generation models support the
+   * `character_insertion_bias` parameter. These parameters are not available with
+   * previous-generation models.
    *
-   * <p>Next-generation models do not support all of the speech recognition parameters that are
-   * available for use with previous-generation models. Next-generation models do not support the
-   * following parameters: * `acoustic_customization_id` * `keywords` and `keywords_threshold` *
-   * `processing_metrics` and `processing_metrics_interval` * `word_alternatives_threshold`
+   * <p>Large speech models and next-generation models do not support all of the speech recognition
+   * parameters that are available for use with previous-generation models. Next-generation models
+   * do not support the following parameters: * `acoustic_customization_id` * `keywords` and
+   * `keywords_threshold` * `processing_metrics` and `processing_metrics_interval` *
+   * `word_alternatives_threshold`
    *
    * <p>**Important:** Effective **31 July 2023**, all previous-generation models will be removed
    * from the service and the documentation. Most previous-generation models were deprecated on 15
-   * March 2022. You must migrate to the equivalent next-generation model by 31 July 2023. For more
-   * information, see [Migrating to next-generation
+   * March 2022. You must migrate to the equivalent large speech model or next-generation model by
+   * 31 July 2023. For more information, see [Migrating to large speech
    * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-models-migrate).
    *
-   * <p>**See also:** * [Next-generation languages and
+   * <p>**See also:** * [Large speech languages and
+   * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-models-large-speech-languages)
+   * * [Supported features for large speech
+   * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-models-large-speech-languages#models-lsm-supported-features)
+   * * [Next-generation languages and
    * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-models-ng) * [Supported
    * features for next-generation
    * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-models-ng#models-ng-features).
@@ -994,14 +1009,49 @@ public ServiceCall<Void> deleteJob(DeleteJobOptions deleteJobOptions) {
    *
    * <p>**Important:** Effective **31 July 2023**, all previous-generation models will be removed
    * from the service and the documentation. Most previous-generation models were deprecated on 15
-   * March 2022. You must migrate to the equivalent next-generation model by 31 July 2023. For more
-   * information, see [Migrating to next-generation
+   * March 2022. You must migrate to the equivalent large speech model or next-generation model by
+   * 31 July 2023. For more information, see [Migrating to large speech
    * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-models-migrate).
    *
    * <p>**See also:** * [Create a custom language
    * model](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-languageCreate#createModel-language)
    * * [Language support for
-   * customization](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-custom-support).
+   * customization](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-custom-support)
+   *
+   * <p>### Large speech models and Next-generation models
+   *
+   * <p>The service supports large speech models and next-generation `Multimedia` (16 kHz) and
+   * `Telephony` (8 kHz) models for many languages. Large speech models and next-generation models
+   * have higher throughput than the service's previous generation of `Broadband` and `Narrowband`
+   * models. When you use large speech models and next-generation models, the service can return
+   * transcriptions more quickly and also provide noticeably better transcription accuracy.
+   *
+   * <p>You specify a large speech model or next-generation model by using the `model` query
+   * parameter, as you do a previous-generation model. Only the next-generation models support the
+   * `low_latency` parameter, and all large speech models and next-generation models support the
+   * `character_insertion_bias` parameter. These parameters are not available with
+   * previous-generation models.
+   *
+   * <p>Large speech models and next-generation models do not support all of the speech recognition
+   * parameters that are available for use with previous-generation models. Next-generation models
+   * do not support the following parameters: * `acoustic_customization_id` * `keywords` and
+   * `keywords_threshold` * `processing_metrics` and `processing_metrics_interval` *
+   * `word_alternatives_threshold`
+   *
+   * <p>**Important:** Effective **31 July 2023**, all previous-generation models will be removed
+   * from the service and the documentation. Most previous-generation models were deprecated on 15
+   * March 2022. You must migrate to the equivalent large speech model or next-generation model by
+   * 31 July 2023. For more information, see [Migrating to large speech
+   * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-models-migrate).
+   *
+   * <p>**See also:** * [Large speech languages and
+   * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-models-large-speech-languages)
+   * * [Supported features for large speech
+   * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-models-large-speech-languages#models-lsm-supported-features)
+   * * [Next-generation languages and
+   * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-models-ng) * [Supported
+   * features for next-generation
+   * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-models-ng#models-ng-features).
    *
    * @param createLanguageModelOptions the {@link CreateLanguageModelOptions} containing the options
    *     for the call
@@ -1403,6 +1453,10 @@ public ServiceCall<Corpora> listCorpora(ListCorporaOptions listCorporaOptions) {
    * until the service's analysis of the corpus for the current request completes. Use the [Get a
    * corpus](#getcorpus) method to check the status of the analysis.
    *
+   * <p>_For custom models that are based on large speech models_, the service parses and extracts
+   * word sequences from one or multiple corpora files. The characters help the service learn and
+   * predict character sequences from audio.
+   *
    * <p>_For custom models that are based on previous-generation models_, the service auto-populates
    * the model's words resource with words from the corpus that are not found in its base
    * vocabulary. These words are referred to as out-of-vocabulary (OOV) words. After adding a
@@ -1429,11 +1483,11 @@ public ServiceCall<Corpora> listCorpora(ListCorporaOptions listCorporaOptions) {
    * model](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-languageCreate#addCorpus)
    * * [Working with corpora for previous-generation
    * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-corporaWords#workingCorpora)
-   * * [Working with corpora for next-generation
+   * * [Working with corpora for large speech models and next-generation
    * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-corporaWords-ng#workingCorpora-ng)
    * * [Validating a words resource for previous-generation
    * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-corporaWords#validateModel)
-   * * [Validating a words resource for next-generation
+   * * [Validating a words resource for large speech models and next-generation
    * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-corporaWords-ng#validateModel-ng).
    *
    * @param addCorpusOptions the {@link AddCorpusOptions} containing the options for the call
@@ -1657,11 +1711,11 @@ public ServiceCall<Words> listWords(ListWordsOptions listWordsOptions) {
    * model](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-languageCreate#addWords)
    * * [Working with custom words for previous-generation
    * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-corporaWords#workingWords)
-   * * [Working with custom words for next-generation
+   * * [Working with custom words for large speech models and next-generation
    * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-corporaWords-ng#workingWords-ng)
    * * [Validating a words resource for previous-generation
    * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-corporaWords#validateModel)
-   * * [Validating a words resource for next-generation
+   * * [Validating a words resource for large speech models and next-generation
    * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-corporaWords-ng#validateModel-ng).
    *
    * @param addWordsOptions the {@link AddWordsOptions} containing the options for the call
@@ -1732,11 +1786,11 @@ public ServiceCall<Void> addWords(AddWordsOptions addWordsOptions) {
    * model](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-languageCreate#addWords)
    * * [Working with custom words for previous-generation
    * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-corporaWords#workingWords)
-   * * [Working with custom words for next-generation
+   * * [Working with custom words for large speech models and next-generation
    * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-corporaWords-ng#workingWords-ng)
    * * [Validating a words resource for previous-generation
    * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-corporaWords#validateModel)
-   * * [Validating a words resource for next-generation
+   * * [Validating a words resource for large speech models and next-generation
    * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-corporaWords-ng#validateModel-ng).
    *
    * @param addWordOptions the {@link AddWordOptions} containing the options for the call
@@ -2057,12 +2111,12 @@ public ServiceCall<Void> deleteGrammar(DeleteGrammarOptions deleteGrammarOptions
    * but you cannot create any more until your model count is below the limit.
    *
    * <p>**Note:** Acoustic model customization is supported only for use with previous-generation
-   * models. It is not supported for next-generation models.
+   * models. It is not supported for large speech models and next-generation models.
    *
    * <p>**Important:** Effective **31 July 2023**, all previous-generation models will be removed
    * from the service and the documentation. Most previous-generation models were deprecated on 15
-   * March 2022. You must migrate to the equivalent next-generation model by 31 July 2023. For more
-   * information, see [Migrating to next-generation
+   * March 2022. You must migrate to the equivalent large speech model or next-generation model by
+   * 31 July 2023. For more information, see [Migrating to large speech
    * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-models-migrate).
    *
    * <p>**See also:** [Create a custom acoustic
@@ -2107,7 +2161,7 @@ public ServiceCall<AcousticModel> createAcousticModel(
    * credentials for the instance of the service that owns a model to list information about it.
    *
    * <p>**Note:** Acoustic model customization is supported only for use with previous-generation
-   * models. It is not supported for next-generation models.
+   * models. It is not supported for large speech models and next-generation models.
    *
    * <p>**See also:** [Listing custom acoustic
    * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-manageAcousticModels#listModels-acoustic).
@@ -2148,7 +2202,7 @@ public ServiceCall<AcousticModels> listAcousticModels(
    * credentials for the instance of the service that owns a model to list information about it.
    *
    * <p>**Note:** Acoustic model customization is supported only for use with previous-generation
-   * models. It is not supported for next-generation models.
+   * models. It is not supported for large speech models and next-generation models.
    *
    * <p>**See also:** [Listing custom acoustic
    * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-manageAcousticModels#listModels-acoustic).
@@ -2166,7 +2220,7 @@ public ServiceCall<AcousticModels> listAcousticModels() {
    * instance of the service that owns a model to list information about it.
    *
    * <p>**Note:** Acoustic model customization is supported only for use with previous-generation
-   * models. It is not supported for next-generation models.
+   * models. It is not supported for large speech models and next-generation models.
    *
    * <p>**See also:** [Listing custom acoustic
    * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-manageAcousticModels#listModels-acoustic).
@@ -2205,7 +2259,7 @@ public ServiceCall<AcousticModel> getAcousticModel(
    * use credentials for the instance of the service that owns a model to delete it.
    *
    * <p>**Note:** Acoustic model customization is supported only for use with previous-generation
-   * models. It is not supported for next-generation models.
+   * models. It is not supported for large speech models and next-generation models.
    *
    * <p>**See also:** [Deleting a custom acoustic
    * model](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-manageAcousticModels#deleteModel-acoustic).
@@ -2268,7 +2322,7 @@ public ServiceCall<Void> deleteAcousticModel(
    * fully trained and available.
    *
    * <p>**Note:** Acoustic model customization is supported only for use with previous-generation
-   * models. It is not supported for next-generation models.
+   * models. It is not supported for large speech models and next-generation models.
    *
    * <p>**See also:** * [Train the custom acoustic
    * model](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-acoustic#trainModel-acoustic)
@@ -2342,7 +2396,7 @@ public ServiceCall<TrainingResponse> trainAcousticModel(
    * owns a model to reset it.
    *
    * <p>**Note:** Acoustic model customization is supported only for use with previous-generation
-   * models. It is not supported for next-generation models.
+   * models. It is not supported for large speech models and next-generation models.
    *
    * <p>**See also:** [Resetting a custom acoustic
    * model](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-manageAcousticModels#resetModel-acoustic).
@@ -2400,7 +2454,7 @@ public ServiceCall<Void> resetAcousticModel(ResetAcousticModelOptions resetAcous
    * language model.
    *
    * <p>**Note:** Acoustic model customization is supported only for use with previous-generation
-   * models. It is not supported for next-generation models.
+   * models. It is not supported for large speech models and next-generation models.
    *
    * <p>**See also:** [Upgrading a custom acoustic
    * model](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-custom-upgrade#custom-upgrade-acoustic).
@@ -2450,7 +2504,7 @@ public ServiceCall<Void> upgradeAcousticModel(
    * audio resources.
    *
    * <p>**Note:** Acoustic model customization is supported only for use with previous-generation
-   * models. It is not supported for next-generation models.
+   * models. It is not supported for large speech models and next-generation models.
    *
    * <p>**See also:** [Listing audio resources for a custom acoustic
    * model](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-manageAudio#listAudio).
@@ -2521,7 +2575,7 @@ public ServiceCall<AudioResources> listAudio(ListAudioOptions listAudioOptions)
    * becomes `ok`.
    *
    * <p>**Note:** Acoustic model customization is supported only for use with previous-generation
-   * models. It is not supported for next-generation models.
+   * models. It is not supported for large speech models and next-generation models.
    *
    * <p>**See also:** [Add audio to the custom acoustic
    * model](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-acoustic#addAudio).
@@ -2631,7 +2685,7 @@ public ServiceCall<Void> addAudio(AddAudioOptions addAudioOptions) {
    * resources.
    *
    * <p>**Note:** Acoustic model customization is supported only for use with previous-generation
-   * models. It is not supported for next-generation models.
+   * models. It is not supported for large speech models and next-generation models.
    *
    * <p>**See also:** [Listing audio resources for a custom acoustic
    * model](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-manageAudio#listAudio).
@@ -2676,7 +2730,7 @@ public ServiceCall<AudioListing> getAudio(GetAudioOptions getAudioOptions) {
    * audio resources.
    *
    * <p>**Note:** Acoustic model customization is supported only for use with previous-generation
-   * models. It is not supported for next-generation models.
+   * models. It is not supported for large speech models and next-generation models.
    *
    * <p>**See also:** [Deleting an audio resource from a custom acoustic
    * model](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-manageAudio#deleteAudio).
diff --git a/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/model/Corpus.java b/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/model/Corpus.java
index c67051d400..5c75be5491 100644
--- a/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/model/Corpus.java
+++ b/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/model/Corpus.java
@@ -1,5 +1,5 @@
 /*
- * (C) Copyright IBM Corp. 2016, 2023.
+ * (C) Copyright IBM Corp. 2024.
  *
  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
  * the License. You may obtain a copy of the License at
@@ -73,8 +73,9 @@ public Long getTotalWords() {
   /**
    * Gets the outOfVocabularyWords.
    *
-   * <p>_For custom models that are based on previous-generation models_, the number of OOV words
-   * extracted from the corpus. The value is `0` while the corpus is being processed.
+   * <p>_For custom models that are based on large speech models and previous-generation models_,
+   * the number of OOV words extracted from the corpus. The value is `0` while the corpus is being
+   * processed.
    *
    * <p>_For custom models that are based on next-generation models_, no OOV words are extracted
    * from corpora, so the value is always `0`.
diff --git a/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/model/CreateJobOptions.java b/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/model/CreateJobOptions.java
index 6508138f67..45d4ad890b 100644
--- a/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/model/CreateJobOptions.java
+++ b/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/model/CreateJobOptions.java
@@ -1,5 +1,5 @@
 /*
- * (C) Copyright IBM Corp. 2018, 2024.
+ * (C) Copyright IBM Corp. 2024.
  *
  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
  * the License. You may obtain a copy of the License at
@@ -51,6 +51,8 @@ public interface Model {
     String DE_DE_NARROWBANDMODEL = "de-DE_NarrowbandModel";
     /** de-DE_Telephony. */
     String DE_DE_TELEPHONY = "de-DE_Telephony";
+    /** en-AU. */
+    String EN_AU = "en-AU";
     /** en-AU_BroadbandModel. */
     String EN_AU_BROADBANDMODEL = "en-AU_BroadbandModel";
     /** en-AU_Multimedia. */
@@ -59,8 +61,12 @@ public interface Model {
     String EN_AU_NARROWBANDMODEL = "en-AU_NarrowbandModel";
     /** en-AU_Telephony. */
     String EN_AU_TELEPHONY = "en-AU_Telephony";
+    /** en-IN. */
+    String EN_IN = "en-IN";
     /** en-IN_Telephony. */
     String EN_IN_TELEPHONY = "en-IN_Telephony";
+    /** en-GB. */
+    String EN_GB = "en-GB";
     /** en-GB_BroadbandModel. */
     String EN_GB_BROADBANDMODEL = "en-GB_BroadbandModel";
     /** en-GB_Multimedia. */
@@ -69,6 +75,8 @@ public interface Model {
     String EN_GB_NARROWBANDMODEL = "en-GB_NarrowbandModel";
     /** en-GB_Telephony. */
     String EN_GB_TELEPHONY = "en-GB_Telephony";
+    /** en-US. */
+    String EN_US = "en-US";
     /** en-US_BroadbandModel. */
     String EN_US_BROADBANDMODEL = "en-US_BroadbandModel";
     /** en-US_Multimedia. */
@@ -111,6 +119,8 @@ public interface Model {
     String ES_PE_BROADBANDMODEL = "es-PE_BroadbandModel";
     /** es-PE_NarrowbandModel. */
     String ES_PE_NARROWBANDMODEL = "es-PE_NarrowbandModel";
+    /** fr-CA. */
+    String FR_CA = "fr-CA";
     /** fr-CA_BroadbandModel. */
     String FR_CA_BROADBANDMODEL = "fr-CA_BroadbandModel";
     /** fr-CA_Multimedia. */
@@ -119,6 +129,8 @@ public interface Model {
     String FR_CA_NARROWBANDMODEL = "fr-CA_NarrowbandModel";
     /** fr-CA_Telephony. */
     String FR_CA_TELEPHONY = "fr-CA_Telephony";
+    /** fr-FR. */
+    String FR_FR = "fr-FR";
     /** fr-FR_BroadbandModel. */
     String FR_FR_BROADBANDMODEL = "fr-FR_BroadbandModel";
     /** fr-FR_Multimedia. */
@@ -137,6 +149,8 @@ public interface Model {
     String IT_IT_MULTIMEDIA = "it-IT_Multimedia";
     /** it-IT_Telephony. */
     String IT_IT_TELEPHONY = "it-IT_Telephony";
+    /** ja-JP. */
+    String JA_JP = "ja-JP";
     /** ja-JP_BroadbandModel. */
     String JA_JP_BROADBANDMODEL = "ja-JP_BroadbandModel";
     /** ja-JP_Multimedia. */
@@ -952,9 +966,9 @@ public String baseModelVersion() {
    * custom language model compared to those from the base model for the current request.
    *
    * <p>Specify a value between 0.0 and 1.0. Unless a different customization weight was specified
-   * for the custom model when the model was trained, the default value is: * 0.3 for
-   * previous-generation models * 0.2 for most next-generation models * 0.1 for next-generation
-   * English and Japanese models
+   * for the custom model when the model was trained, the default value is: * 0.5 for large speech
+   * models * 0.3 for previous-generation models * 0.2 for most next-generation models * 0.1 for
+   * next-generation English and Japanese models
    *
    * <p>A customization weight that you specify overrides a weight that was specified when the
    * custom model was trained. The default value yields the best performance in general. Assign a
@@ -1117,8 +1131,8 @@ public Boolean smartFormatting() {
   /**
    * Gets the smartFormattingVersion.
    *
-   * <p>Smart formatting version is for next-generation models and that is supported in US English,
-   * Brazilian Portuguese, French and German languages.
+   * <p>Smart formatting version for large speech models and next-generation models is supported in
+   * US English, Brazilian Portuguese, French, German, Spanish and French Canadian languages.
    *
    * @return the smartFormattingVersion
    */
@@ -1135,8 +1149,8 @@ public Long smartFormattingVersion() {
    * of whether you specify `false` for the parameter. * _For previous-generation models,_ the
    * parameter can be used with Australian English, US English, German, Japanese, Korean, and
    * Spanish (both broadband and narrowband models) and UK English (narrowband model) transcription
-   * only. * _For next-generation models,_ the parameter can be used with Czech, English
-   * (Australian, Indian, UK, and US), German, Japanese, Korean, and Spanish transcription only.
+   * only. * _For large speech models and next-generation models,_ the parameter can be used with
+   * all available languages.
    *
    * <p>See [Speaker
    * labels](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-speaker-labels).
@@ -1310,8 +1324,8 @@ public Boolean splitTranscriptAtPhraseEnd() {
    * <p>The values increase on a monotonic curve. Specifying one or two decimal places of precision
    * (for example, `0.55`) is typically more than sufficient.
    *
-   * <p>The parameter is supported with all next-generation models and with most previous-generation
-   * models. See [Speech detector
+   * <p>The parameter is supported with all large speech models, next-generation models and with
+   * most previous-generation models. See [Speech detector
    * sensitivity](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-detection#detection-parameters-sensitivity)
    * and [Language model
    * support](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-detection#detection-support).
@@ -1336,8 +1350,8 @@ public Float speechDetectorSensitivity() {
    * <p>The values increase on a monotonic curve. Specifying one or two decimal places of precision
    * (for example, `0.55`) is typically more than sufficient.
    *
-   * <p>The parameter is supported with all next-generation models and with most previous-generation
-   * models. See [Background audio
+   * <p>The parameter is supported with all large speech models, next-generation models and with
+   * most previous-generation models. See [Background audio
    * suppression](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-detection#detection-parameters-suppression)
    * and [Language model
    * support](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-detection#detection-support).
@@ -1357,9 +1371,9 @@ public Float backgroundAudioSuppression() {
    * parameter causes the models to produce results even more quickly, though the results might be
    * less accurate when the parameter is used.
    *
-   * <p>The parameter is not available for previous-generation `Broadband` and `Narrowband` models.
-   * It is available for most next-generation models. * For a list of next-generation models that
-   * support low latency, see [Supported next-generation language
+   * <p>The parameter is not available for large speech models and previous-generation `Broadband`
+   * and `Narrowband` models. It is available for most next-generation models. * For a list of
+   * next-generation models that support low latency, see [Supported next-generation language
    * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-models-ng#models-ng-supported).
    * * For more information about the `low_latency` parameter, see [Low
    * latency](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-interim#low-latency).
@@ -1373,9 +1387,10 @@ public Boolean lowLatency() {
   /**
    * Gets the characterInsertionBias.
    *
-   * <p>For next-generation models, an indication of whether the service is biased to recognize
-   * shorter or longer strings of characters when developing transcription hypotheses. By default,
-   * the service is optimized to produce the best balance of strings of different lengths.
+   * <p>For large speech models and next-generation models, an indication of whether the service is
+   * biased to recognize shorter or longer strings of characters when developing transcription
+   * hypotheses. By default, the service is optimized to produce the best balance of strings of
+   * different lengths.
    *
    * <p>The default bias is 0.0. The allowable range of values is -1.0 to 1.0. * Negative values
    * bias the service to favor hypotheses with shorter strings of characters. * Positive values bias
diff --git a/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/model/CreateLanguageModelOptions.java b/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/model/CreateLanguageModelOptions.java
index e6922f9a05..99cf429c92 100644
--- a/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/model/CreateLanguageModelOptions.java
+++ b/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/model/CreateLanguageModelOptions.java
@@ -1,5 +1,5 @@
 /*
- * (C) Copyright IBM Corp. 2018, 2023.
+ * (C) Copyright IBM Corp. 2024.
  *
  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
  * the License. You may obtain a copy of the License at
@@ -39,6 +39,8 @@ public interface BaseModelName {
     String DE_DE_NARROWBANDMODEL = "de-DE_NarrowbandModel";
     /** de-DE_Telephony. */
     String DE_DE_TELEPHONY = "de-DE_Telephony";
+    /** en-AU. */
+    String EN_AU = "en-AU";
     /** en-AU_BroadbandModel. */
     String EN_AU_BROADBANDMODEL = "en-AU_BroadbandModel";
     /** en-AU_Multimedia. */
@@ -47,6 +49,8 @@ public interface BaseModelName {
     String EN_AU_NARROWBANDMODEL = "en-AU_NarrowbandModel";
     /** en-AU_Telephony. */
     String EN_AU_TELEPHONY = "en-AU_Telephony";
+    /** en-GB. */
+    String EN_GB = "en-GB";
     /** en-GB_BroadbandModel. */
     String EN_GB_BROADBANDMODEL = "en-GB_BroadbandModel";
     /** en-GB_Multimedia. */
@@ -55,8 +59,12 @@ public interface BaseModelName {
     String EN_GB_NARROWBANDMODEL = "en-GB_NarrowbandModel";
     /** en-GB_Telephony. */
     String EN_GB_TELEPHONY = "en-GB_Telephony";
+    /** en-IN. */
+    String EN_IN = "en-IN";
     /** en-IN_Telephony. */
     String EN_IN_TELEPHONY = "en-IN_Telephony";
+    /** en-US. */
+    String EN_US = "en-US";
     /** en-US_BroadbandModel. */
     String EN_US_BROADBANDMODEL = "en-US_BroadbandModel";
     /** en-US_Multimedia. */
@@ -99,6 +107,8 @@ public interface BaseModelName {
     String ES_PE_BROADBANDMODEL = "es-PE_BroadbandModel";
     /** es-PE_NarrowbandModel. */
     String ES_PE_NARROWBANDMODEL = "es-PE_NarrowbandModel";
+    /** fr-CA. */
+    String FR_CA = "fr-CA";
     /** fr-CA_BroadbandModel. */
     String FR_CA_BROADBANDMODEL = "fr-CA_BroadbandModel";
     /** fr-CA_Multimedia. */
@@ -107,6 +117,8 @@ public interface BaseModelName {
     String FR_CA_NARROWBANDMODEL = "fr-CA_NarrowbandModel";
     /** fr-CA_Telephony. */
     String FR_CA_TELEPHONY = "fr-CA_Telephony";
+    /** fr-FR. */
+    String FR_FR = "fr-FR";
     /** fr-FR_BroadbandModel. */
     String FR_FR_BROADBANDMODEL = "fr-FR_BroadbandModel";
     /** fr-FR_Multimedia. */
@@ -125,6 +137,8 @@ public interface BaseModelName {
     String IT_IT_MULTIMEDIA = "it-IT_Multimedia";
     /** it-IT_Telephony. */
     String IT_IT_TELEPHONY = "it-IT_Telephony";
+    /** ja-JP. */
+    String JA_JP = "ja-JP";
     /** ja-JP_BroadbandModel. */
     String JA_JP_BROADBANDMODEL = "ja-JP_BroadbandModel";
     /** ja-JP_Multimedia. */
diff --git a/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/model/GetModelOptions.java b/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/model/GetModelOptions.java
index 58d75de720..88efe09bef 100644
--- a/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/model/GetModelOptions.java
+++ b/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/model/GetModelOptions.java
@@ -1,5 +1,5 @@
 /*
- * (C) Copyright IBM Corp. 2018, 2023.
+ * (C) Copyright IBM Corp. 2024.
  *
  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
  * the License. You may obtain a copy of the License at
@@ -36,6 +36,8 @@ public interface ModelId {
     String DE_DE_NARROWBANDMODEL = "de-DE_NarrowbandModel";
     /** de-DE_Telephony. */
     String DE_DE_TELEPHONY = "de-DE_Telephony";
+    /** en-AU. */
+    String EN_AU = "en-AU";
     /** en-AU_BroadbandModel. */
     String EN_AU_BROADBANDMODEL = "en-AU_BroadbandModel";
     /** en-AU_Multimedia. */
@@ -44,6 +46,8 @@ public interface ModelId {
     String EN_AU_NARROWBANDMODEL = "en-AU_NarrowbandModel";
     /** en-AU_Telephony. */
     String EN_AU_TELEPHONY = "en-AU_Telephony";
+    /** en-GB. */
+    String EN_GB = "en-GB";
     /** en-GB_BroadbandModel. */
     String EN_GB_BROADBANDMODEL = "en-GB_BroadbandModel";
     /** en-GB_Multimedia. */
@@ -52,8 +56,12 @@ public interface ModelId {
     String EN_GB_NARROWBANDMODEL = "en-GB_NarrowbandModel";
     /** en-GB_Telephony. */
     String EN_GB_TELEPHONY = "en-GB_Telephony";
+    /** en-IN. */
+    String EN_IN = "en-IN";
     /** en-IN_Telephony. */
     String EN_IN_TELEPHONY = "en-IN_Telephony";
+    /** en-US. */
+    String EN_US = "en-US";
     /** en-US_BroadbandModel. */
     String EN_US_BROADBANDMODEL = "en-US_BroadbandModel";
     /** en-US_Multimedia. */
@@ -96,6 +104,8 @@ public interface ModelId {
     String ES_PE_BROADBANDMODEL = "es-PE_BroadbandModel";
     /** es-PE_NarrowbandModel. */
     String ES_PE_NARROWBANDMODEL = "es-PE_NarrowbandModel";
+    /** fr-CA. */
+    String FR_CA = "fr-CA";
     /** fr-CA_BroadbandModel. */
     String FR_CA_BROADBANDMODEL = "fr-CA_BroadbandModel";
     /** fr-CA_Multimedia. */
@@ -104,6 +114,8 @@ public interface ModelId {
     String FR_CA_NARROWBANDMODEL = "fr-CA_NarrowbandModel";
     /** fr-CA_Telephony. */
     String FR_CA_TELEPHONY = "fr-CA_Telephony";
+    /** fr-FR. */
+    String FR_FR = "fr-FR";
     /** fr-FR_BroadbandModel. */
     String FR_FR_BROADBANDMODEL = "fr-FR_BroadbandModel";
     /** fr-FR_Multimedia. */
@@ -122,6 +134,8 @@ public interface ModelId {
     String IT_IT_MULTIMEDIA = "it-IT_Multimedia";
     /** it-IT_Telephony. */
     String IT_IT_TELEPHONY = "it-IT_Telephony";
+    /** ja-JP. */
+    String JA_JP = "ja-JP";
     /** ja-JP_BroadbandModel. */
     String JA_JP_BROADBANDMODEL = "ja-JP_BroadbandModel";
     /** ja-JP_Multimedia. */
diff --git a/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/model/RecognizeOptions.java b/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/model/RecognizeOptions.java
index 94476fbdb5..21119472b5 100644
--- a/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/model/RecognizeOptions.java
+++ b/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/model/RecognizeOptions.java
@@ -1,5 +1,5 @@
 /*
- * (C) Copyright IBM Corp. 2016, 2024.
+ * (C) Copyright IBM Corp. 2024.
  *
  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
  * the License. You may obtain a copy of the License at
@@ -51,6 +51,8 @@ public interface Model {
     String DE_DE_NARROWBANDMODEL = "de-DE_NarrowbandModel";
     /** de-DE_Telephony. */
     String DE_DE_TELEPHONY = "de-DE_Telephony";
+    /** en-AU. */
+    String EN_AU = "en-AU";
     /** en-AU_BroadbandModel. */
     String EN_AU_BROADBANDMODEL = "en-AU_BroadbandModel";
     /** en-AU_Multimedia. */
@@ -59,8 +61,12 @@ public interface Model {
     String EN_AU_NARROWBANDMODEL = "en-AU_NarrowbandModel";
     /** en-AU_Telephony. */
     String EN_AU_TELEPHONY = "en-AU_Telephony";
+    /** en-IN. */
+    String EN_IN = "en-IN";
     /** en-IN_Telephony. */
     String EN_IN_TELEPHONY = "en-IN_Telephony";
+    /** en-GB. */
+    String EN_GB = "en-GB";
     /** en-GB_BroadbandModel. */
     String EN_GB_BROADBANDMODEL = "en-GB_BroadbandModel";
     /** en-GB_Multimedia. */
@@ -69,6 +75,8 @@ public interface Model {
     String EN_GB_NARROWBANDMODEL = "en-GB_NarrowbandModel";
     /** en-GB_Telephony. */
     String EN_GB_TELEPHONY = "en-GB_Telephony";
+    /** en-US. */
+    String EN_US = "en-US";
     /** en-US_BroadbandModel. */
     String EN_US_BROADBANDMODEL = "en-US_BroadbandModel";
     /** en-US_Multimedia. */
@@ -111,6 +119,8 @@ public interface Model {
     String ES_PE_BROADBANDMODEL = "es-PE_BroadbandModel";
     /** es-PE_NarrowbandModel. */
     String ES_PE_NARROWBANDMODEL = "es-PE_NarrowbandModel";
+    /** fr-CA. */
+    String FR_CA = "fr-CA";
     /** fr-CA_BroadbandModel. */
     String FR_CA_BROADBANDMODEL = "fr-CA_BroadbandModel";
     /** fr-CA_Multimedia. */
@@ -119,6 +129,8 @@ public interface Model {
     String FR_CA_NARROWBANDMODEL = "fr-CA_NarrowbandModel";
     /** fr-CA_Telephony. */
     String FR_CA_TELEPHONY = "fr-CA_Telephony";
+    /** fr-FR. */
+    String FR_FR = "fr-FR";
     /** fr-FR_BroadbandModel. */
     String FR_FR_BROADBANDMODEL = "fr-FR_BroadbandModel";
     /** fr-FR_Multimedia. */
@@ -137,6 +149,8 @@ public interface Model {
     String IT_IT_MULTIMEDIA = "it-IT_Multimedia";
     /** it-IT_Telephony. */
     String IT_IT_TELEPHONY = "it-IT_Telephony";
+    /** ja-JP. */
+    String JA_JP = "ja-JP";
     /** ja-JP_BroadbandModel. */
     String JA_JP_BROADBANDMODEL = "ja-JP_BroadbandModel";
     /** ja-JP_Multimedia. */
@@ -184,6 +198,7 @@ public interface Model {
   protected InputStream audio;
   protected String contentType;
   protected String model;
+  protected Boolean speechBeginEvent;
   protected String languageCustomizationId;
   protected String acousticCustomizationId;
   protected String baseModelVersion;
@@ -214,6 +229,7 @@ public static class Builder {
     private InputStream audio;
     private String contentType;
     private String model;
+    private Boolean speechBeginEvent;
     private String languageCustomizationId;
     private String acousticCustomizationId;
     private String baseModelVersion;
@@ -248,6 +264,7 @@ private Builder(RecognizeOptions recognizeOptions) {
       this.audio = recognizeOptions.audio;
       this.contentType = recognizeOptions.contentType;
       this.model = recognizeOptions.model;
+      this.speechBeginEvent = recognizeOptions.speechBeginEvent;
       this.languageCustomizationId = recognizeOptions.languageCustomizationId;
       this.acousticCustomizationId = recognizeOptions.acousticCustomizationId;
       this.baseModelVersion = recognizeOptions.baseModelVersion;
@@ -343,6 +360,17 @@ public Builder model(String model) {
       return this;
     }
 
+    /**
+     * Set the speechBeginEvent.
+     *
+     * @param speechBeginEvent the speechBeginEvent
+     * @return the RecognizeOptions builder
+     */
+    public Builder speechBeginEvent(Boolean speechBeginEvent) {
+      this.speechBeginEvent = speechBeginEvent;
+      return this;
+    }
+
     /**
      * Set the languageCustomizationId.
      *
@@ -627,6 +655,7 @@ protected RecognizeOptions(Builder builder) {
     audio = builder.audio;
     contentType = builder.contentType;
     model = builder.model;
+    speechBeginEvent = builder.speechBeginEvent;
     languageCustomizationId = builder.languageCustomizationId;
     acousticCustomizationId = builder.acousticCustomizationId;
     baseModelVersion = builder.baseModelVersion;
@@ -706,6 +735,22 @@ public String model() {
     return model;
   }
 
+  /**
+   * Gets the speechBeginEvent.
+   *
+   * <p>If `true`, the service returns a response object `SpeechActivity` which contains the time
+   * when a speech activity is detected in the stream. This can be used both in standard and low
+   * latency mode. This feature enables client applications to know that some words/speech has been
+   * detected and the service is in the process of decoding. This can be used in lieu of interim
+   * results in standard mode. See [Using speech recognition
+   * parameters](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-service-features#features-parameters).
+   *
+   * @return the speechBeginEvent
+   */
+  public Boolean speechBeginEvent() {
+    return speechBeginEvent;
+  }
+
   /**
    * Gets the languageCustomizationId.
    *
@@ -764,9 +809,9 @@ public String baseModelVersion() {
    * custom language model compared to those from the base model for the current request.
    *
    * <p>Specify a value between 0.0 and 1.0. Unless a different customization weight was specified
-   * for the custom model when the model was trained, the default value is: * 0.3 for
-   * previous-generation models * 0.2 for most next-generation models * 0.1 for next-generation
-   * English and Japanese models
+   * for the custom model when the model was trained, the default value is: * 0.5 for large speech
+   * models * 0.3 for previous-generation models * 0.2 for most next-generation models * 0.1 for
+   * next-generation English and Japanese models
    *
    * <p>A customization weight that you specify overrides a weight that was specified when the
    * custom model was trained. The default value yields the best performance in general. Assign a
@@ -929,8 +974,8 @@ public Boolean smartFormatting() {
   /**
    * Gets the smartFormattingVersion.
    *
-   * <p>Smart formatting version is for next-generation models and that is supported in US English,
-   * Brazilian Portuguese, French and German languages.
+   * <p>Smart formatting version for large speech models and next-generation models is supported in
+   * US English, Brazilian Portuguese, French, German, Spanish and French Canadian languages.
    *
    * @return the smartFormattingVersion
    */
@@ -947,8 +992,8 @@ public Long smartFormattingVersion() {
    * of whether you specify `false` for the parameter. * _For previous-generation models,_ the
    * parameter can be used with Australian English, US English, German, Japanese, Korean, and
    * Spanish (both broadband and narrowband models) and UK English (narrowband model) transcription
-   * only. * _For next-generation models,_ the parameter can be used with Czech, English
-   * (Australian, Indian, UK, and US), German, Japanese, Korean, and Spanish transcription only.
+   * only. * _For large speech models and next-generation models,_ the parameter can be used with
+   * all available languages.
    *
    * <p>See [Speaker
    * labels](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-speaker-labels).
@@ -1080,8 +1125,8 @@ public Boolean splitTranscriptAtPhraseEnd() {
    * <p>The values increase on a monotonic curve. Specifying one or two decimal places of precision
    * (for example, `0.55`) is typically more than sufficient.
    *
-   * <p>The parameter is supported with all next-generation models and with most previous-generation
-   * models. See [Speech detector
+   * <p>The parameter is supported with all large speech models, next-generation models and with
+   * most previous-generation models. See [Speech detector
    * sensitivity](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-detection#detection-parameters-sensitivity)
    * and [Language model
    * support](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-detection#detection-support).
@@ -1106,8 +1151,8 @@ public Float speechDetectorSensitivity() {
    * <p>The values increase on a monotonic curve. Specifying one or two decimal places of precision
    * (for example, `0.55`) is typically more than sufficient.
    *
-   * <p>The parameter is supported with all next-generation models and with most previous-generation
-   * models. See [Background audio
+   * <p>The parameter is supported with all large speech models, next-generation models and with
+   * most previous-generation models. See [Background audio
    * suppression](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-detection#detection-parameters-suppression)
    * and [Language model
    * support](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-detection#detection-support).
@@ -1127,9 +1172,9 @@ public Float backgroundAudioSuppression() {
    * parameter causes the models to produce results even more quickly, though the results might be
    * less accurate when the parameter is used.
    *
-   * <p>The parameter is not available for previous-generation `Broadband` and `Narrowband` models.
-   * It is available for most next-generation models. * For a list of next-generation models that
-   * support low latency, see [Supported next-generation language
+   * <p>The parameter is not available for large speech models and previous-generation `Broadband`
+   * and `Narrowband` models. It is available for most next-generation models. * For a list of
+   * next-generation models that support low latency, see [Supported next-generation language
    * models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-models-ng#models-ng-supported).
    * * For more information about the `low_latency` parameter, see [Low
    * latency](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-interim#low-latency).
@@ -1143,9 +1188,10 @@ public Boolean lowLatency() {
   /**
    * Gets the characterInsertionBias.
    *
-   * <p>For next-generation models, an indication of whether the service is biased to recognize
-   * shorter or longer strings of characters when developing transcription hypotheses. By default,
-   * the service is optimized to produce the best balance of strings of different lengths.
+   * <p>For large speech models and next-generation models, an indication of whether the service is
+   * biased to recognize shorter or longer strings of characters when developing transcription
+   * hypotheses. By default, the service is optimized to produce the best balance of strings of
+   * different lengths.
    *
    * <p>The default bias is 0.0. The allowable range of values is -1.0 to 1.0. * Negative values
    * bias the service to favor hypotheses with shorter strings of characters. * Positive values bias
diff --git a/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/model/TrainLanguageModelOptions.java b/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/model/TrainLanguageModelOptions.java
index f32bd6de8d..53a61a7f92 100644
--- a/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/model/TrainLanguageModelOptions.java
+++ b/speech-to-text/src/main/java/com/ibm/watson/speech_to_text/v1/model/TrainLanguageModelOptions.java
@@ -1,5 +1,5 @@
 /*
- * (C) Copyright IBM Corp. 2018, 2024.
+ * (C) Copyright IBM Corp. 2024.
  *
  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
  * the License. You may obtain a copy of the License at
@@ -25,9 +25,9 @@ public class TrainLanguageModelOptions extends GenericModel {
    * that were added or modified by the user directly. The model is not trained on new words
    * extracted from corpora or grammars.
    *
-   * <p>_For custom models that are based on next-generation models_, the service ignores the
-   * parameter. The words resource contains only custom words that the user adds or modifies
-   * directly, so the parameter is unnecessary.
+   * <p>_For custom models that are based on large speech models and next-generation models_, the
+   * service ignores the `word_type_to_add` parameter. The words resource contains only custom words
+   * that the user adds or modifies directly, so the parameter is unnecessary.
    */
   public interface WordTypeToAdd {
     /** all. */
@@ -184,9 +184,9 @@ public String customizationId() {
    * that were added or modified by the user directly. The model is not trained on new words
    * extracted from corpora or grammars.
    *
-   * <p>_For custom models that are based on next-generation models_, the service ignores the
-   * parameter. The words resource contains only custom words that the user adds or modifies
-   * directly, so the parameter is unnecessary.
+   * <p>_For custom models that are based on large speech models and next-generation models_, the
+   * service ignores the `word_type_to_add` parameter. The words resource contains only custom words
+   * that the user adds or modifies directly, so the parameter is unnecessary.
    *
    * @return the wordTypeToAdd
    */
@@ -200,8 +200,8 @@ public String wordTypeToAdd() {
    * <p>Specifies a customization weight for the custom language model. The customization weight
    * tells the service how much weight to give to words from the custom language model compared to
    * those from the base model for speech recognition. Specify a value between 0.0 and 1.0. The
-   * default value is: * 0.3 for previous-generation models * 0.2 for most next-generation models *
-   * 0.1 for next-generation English and Japanese models
+   * default value is: * 0.5 for large speech models * 0.3 for previous-generation models * 0.2 for
+   * most next-generation models * 0.1 for next-generation English and Japanese models
    *
    * <p>The default value yields the best performance in general. Assign a higher value if your
    * audio makes frequent use of OOV words from the custom model. Use caution when setting the
diff --git a/speech-to-text/src/test/java/com/ibm/watson/speech_to_text/v1/SpeechToTextTest.java b/speech-to-text/src/test/java/com/ibm/watson/speech_to_text/v1/SpeechToTextTest.java
index 1c340b1772..d345abbb9d 100755
--- a/speech-to-text/src/test/java/com/ibm/watson/speech_to_text/v1/SpeechToTextTest.java
+++ b/speech-to-text/src/test/java/com/ibm/watson/speech_to_text/v1/SpeechToTextTest.java
@@ -1,5 +1,5 @@
 /*
- * (C) Copyright IBM Corp. 2019, 2024.
+ * (C) Copyright IBM Corp. 2024.
  *
  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
  * the License. You may obtain a copy of the License at
@@ -226,6 +226,7 @@ public void testRecognizeWOptions() throws Throwable {
             .audio(TestUtilities.createMockStream("This is a mock file."))
             .contentType("application/octet-stream")
             .model("en-US_BroadbandModel")
+            .speechBeginEvent(false)
             .languageCustomizationId("testString")
             .acousticCustomizationId("testString")
             .baseModelVersion("testString")
@@ -270,6 +271,7 @@ public void testRecognizeWOptions() throws Throwable {
     Map<String, String> query = TestUtilities.parseQueryString(request);
     assertNotNull(query);
     assertEquals(query.get("model"), "en-US_BroadbandModel");
+    assertEquals(Boolean.valueOf(query.get("speech_begin_event")), Boolean.valueOf(false));
     assertEquals(query.get("language_customization_id"), "testString");
     assertEquals(query.get("acoustic_customization_id"), "testString");
     assertEquals(query.get("base_model_version"), "testString");
diff --git a/speech-to-text/src/test/java/com/ibm/watson/speech_to_text/v1/model/RecognizeOptionsTest.java b/speech-to-text/src/test/java/com/ibm/watson/speech_to_text/v1/model/RecognizeOptionsTest.java
index f146f693b1..9a1da897a5 100644
--- a/speech-to-text/src/test/java/com/ibm/watson/speech_to_text/v1/model/RecognizeOptionsTest.java
+++ b/speech-to-text/src/test/java/com/ibm/watson/speech_to_text/v1/model/RecognizeOptionsTest.java
@@ -1,5 +1,5 @@
 /*
- * (C) Copyright IBM Corp. 2020, 2024.
+ * (C) Copyright IBM Corp. 2024.
  *
  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
  * the License. You may obtain a copy of the License at
@@ -36,6 +36,7 @@ public void testRecognizeOptions() throws Throwable {
             .audio(TestUtilities.createMockStream("This is a mock file."))
             .contentType("application/octet-stream")
             .model("en-US_BroadbandModel")
+            .speechBeginEvent(false)
             .languageCustomizationId("testString")
             .acousticCustomizationId("testString")
             .baseModelVersion("testString")
@@ -66,6 +67,7 @@ public void testRecognizeOptions() throws Throwable {
         IOUtils.toString(TestUtilities.createMockStream("This is a mock file.")));
     assertEquals(recognizeOptionsModel.contentType(), "application/octet-stream");
     assertEquals(recognizeOptionsModel.model(), "en-US_BroadbandModel");
+    assertEquals(recognizeOptionsModel.speechBeginEvent(), Boolean.valueOf(false));
     assertEquals(recognizeOptionsModel.languageCustomizationId(), "testString");
     assertEquals(recognizeOptionsModel.acousticCustomizationId(), "testString");
     assertEquals(recognizeOptionsModel.baseModelVersion(), "testString");