feat (docs): add anthropic 8192 token example (#2751)

content/providers/01-ai-sdk-providers/05-anthropic.mdx

@@ -145,6 +145,30 @@ console.log(result.experimental_providerMetadata?.anthropic);
 // e.g. { cacheCreationInputTokens: 2118, cacheReadInputTokens: 0 }
 ```
 
+### Example: 8192 Max Tokens
+
+The Anthropic beta `max-tokens-3-5-sonnet-2024-07-15` allows you to generate up to 8192 tokens.
+You can use it as follows:
+
+```ts highlight="6-8"
+import { anthropic } from '@ai-sdk/anthropic';
+import { streamText } from 'ai';
+
+const result = await generateText({
+  model: anthropic('claude-3-5-sonnet-20240620'),
+  // enable max tokens beta:
+  headers: { 'anthropic-beta': 'max-tokens-3-5-sonnet-2024-07-15' },
+  maxTokens: 8192, // important: specify max tokens
+  system:
+    "Don't shy away from generating long text. Follow the user's instructions'",
+  prompt:
+    'Invent a new holiday and describe its traditions. Write at least 20 pages.',
+});
+
+console.log(result.text);
+console.log('Token usage:', result.usage);
+```
+
 ### Model Capabilities
 
 | Model                        | Image Input         | Object Generation   | Tool Usage          | Tool Streaming      |

examples/ai-core/src/stream-text/anthropic-max-tokens.ts

@@ -0,0 +1,29 @@
+import { anthropic } from '@ai-sdk/anthropic';
+import { streamText } from 'ai';
+import dotenv from 'dotenv';
+
+dotenv.config();
+
+async function main() {
+  const result = await streamText({
+    model: anthropic('claude-3-5-sonnet-20240620'),
+
+    headers: { 'anthropic-beta': 'max-tokens-3-5-sonnet-2024-07-15' },
+    maxTokens: 8192, // important: specify max tokens
+
+    system:
+      "Don't shy away from generating long text. Follow the user's instructions'",
+    prompt:
+      'Invent a new holiday and describe its traditions. Write at least 20 pages.',
+  });
+
+  for await (const textPart of result.textStream) {
+    process.stdout.write(textPart);
+  }
+
+  console.log();
+  console.log('Token usage:', await result.usage);
+  console.log('Finish reason:', await result.finishReason);
+}
+
+main().catch(console.error);