diff --git a/packages/langchain_openai/lib/src/chat_models/chat_openai.dart b/packages/langchain_openai/lib/src/chat_models/chat_openai.dart
index f1a30ebe..0db934b2 100644
--- a/packages/langchain_openai/lib/src/chat_models/chat_openai.dart
+++ b/packages/langchain_openai/lib/src/chat_models/chat_openai.dart
@@ -304,7 +304,6 @@ class ChatOpenAI extends BaseChatModel<ChatOpenAIOptions> {
       functionCall: functionCall,
       frequencyPenalty:
           options?.frequencyPenalty ?? defaultOptions.frequencyPenalty,
-      instanceId: options?.instanceId ?? defaultOptions.instanceId,
       logitBias: options?.logitBias ?? defaultOptions.logitBias,
       maxTokens: options?.maxTokens ?? defaultOptions.maxTokens,
       n: options?.n ?? defaultOptions.n,
diff --git a/packages/langchain_openai/lib/src/chat_models/models/models.dart b/packages/langchain_openai/lib/src/chat_models/models/models.dart
index 33a67427..57407c4c 100644
--- a/packages/langchain_openai/lib/src/chat_models/models/models.dart
+++ b/packages/langchain_openai/lib/src/chat_models/models/models.dart
@@ -8,7 +8,6 @@ class ChatOpenAIOptions extends ChatModelOptions {
   const ChatOpenAIOptions({
     this.model = 'gpt-3.5-turbo',
     this.frequencyPenalty,
-    this.instanceId,
     this.logitBias,
     this.maxTokens,
     this.n,
@@ -54,10 +53,6 @@ class ChatOpenAIOptions extends ChatModelOptions {
   /// See https://platform.openai.com/docs/api-reference/chat/create#chat-create-frequency_penalty
   final double? frequencyPenalty;
 
-  /// An unique identifier to a custom instance to execute the request.
-  /// The requesting organization is required to have access to the instance.
-  final String? instanceId;
-
   /// Modify the likelihood of specified tokens appearing in the completion.
   ///
   /// See https://platform.openai.com/docs/api-reference/chat/create#chat-create-logit_bias