🪨 feat: Anthropic Beta Support for Bedrock (#11371)

* 🪨 feat: Anthropic Beta Support for Bedrock

- Updated the Bedrock input parser to dynamically generate `anthropic_beta` headers based on the model identifier.
- Added a new utility function `getBedrockAnthropicBetaHeaders` to determine applicable headers for various Anthropic models.
- Modified existing tests to reflect changes in expected `anthropic_beta` values, including new test cases for full model IDs.

* test: Update Bedrock Input Parser Tests for Beta Headers

- Modified the test case for explicit thinking configuration to reflect the addition of `anthropic_beta` headers.
- Ensured that the test now verifies the presence of specific beta header values in the additional model request fields.

packages/data-provider/src/bedrock.ts

@@ -15,6 +15,36 @@ type AnthropicInput = BedrockConverseInput & {
     AnthropicReasoning;
 };
 
+/**
+ * Gets the appropriate anthropic_beta headers for Bedrock Anthropic models.
+ * Bedrock uses `anthropic_beta` (with underscore) in additionalModelRequestFields.
+ *
+ * @param model - The Bedrock model identifier (e.g., "anthropic.claude-sonnet-4-20250514-v1:0")
+ * @returns Array of beta header strings, or empty array if not applicable
+ */
+function getBedrockAnthropicBetaHeaders(model: string): string[] {
+  const betaHeaders: string[] = [];
+
+  const isClaudeThinkingModel =
+    model.includes('anthropic.claude-3-7-sonnet') ||
+    /anthropic\.claude-(?:[4-9](?:\.\d+)?(?:-\d+)?-(?:sonnet|opus|haiku)|(?:sonnet|opus|haiku)-[4-9])/.test(
+      model,
+    );
+
+  const isSonnet4PlusModel =
+    /anthropic\.claude-(?:sonnet-[4-9]|[4-9](?:\.\d+)?(?:-\d+)?-sonnet)/.test(model);
+
+  if (isClaudeThinkingModel) {
+    betaHeaders.push('output-128k-2025-02-19');
+  }
+
+  if (isSonnet4PlusModel) {
+    betaHeaders.push('context-1m-2025-08-07');
+  }
+
+  return betaHeaders;
+}
+
 export const bedrockInputSchema = s.tConversationSchema
   .pick({
     /* LibreChat params; optionType: 'conversation' */
@@ -138,7 +168,10 @@ export const bedrockInputParser = s.tConversationSchema
         additionalFields.thinkingBudget = 2000;
       }
       if (typedData.model.includes('anthropic.')) {
-        additionalFields.anthropic_beta = ['output-128k-2025-02-19'];
+        const betaHeaders = getBedrockAnthropicBetaHeaders(typedData.model);
+        if (betaHeaders.length > 0) {
+          additionalFields.anthropic_beta = betaHeaders;
+        }
       }
     } else if (additionalFields.thinking != null || additionalFields.thinkingBudget != null) {
       delete additionalFields.thinking;