fix(bedrock): beta header filtering for Opus 4.7

- Filter user-provided beta headers through provider config (invoke path)
- Use correct provider="bedrock_converse" for converse API beta filtering
- Strip context-1m-2025-08-07 beta for Opus 4.7 (native 1M context)

litellm/llms/bedrock/chat/converse_transformation.py

@@ -92,7 +92,6 @@ BEDROCK_COMPUTER_USE_TOOLS = [
 ]
 
 
-
 class AmazonConverseConfig(BaseConfig):
     """
     Reference - https://docs.aws.amazon.com/bedrock/latest/APIReference/API_runtime_Converse.html
@@ -1521,7 +1520,7 @@ class AmazonConverseConfig(BaseConfig):
         if anthropic_beta_list and base_model.startswith("anthropic"):
             filtered_betas = filter_and_transform_beta_headers(
                 beta_headers=anthropic_beta_list,
-                provider="bedrock",
+                provider="bedrock_converse",
             )
             if filtered_betas:
                 additional_request_params["anthropic_beta"] = filtered_betas

litellm/llms/bedrock/chat/invoke_transformations/anthropic_claude3_transformation.py

@@ -319,7 +319,11 @@ class AmazonAnthropicClaudeConfig(AmazonInvokeConfig, AnthropicConfig):
             beta_headers=list(beta_set - user_beta_set),
             provider="bedrock",
         )
-        return sorted(user_beta_set.union(set(auto_beta_list)))
+        filtered_user_betas = filter_and_transform_beta_headers(
+            beta_headers=list(user_beta_set),
+            provider="bedrock",
+        )
+        return sorted(set(filtered_user_betas).union(set(auto_beta_list)))
 
     def _convert_document_url_sources_to_base64(self, anthropic_request: dict) -> None:
         """

litellm/llms/bedrock/messages/invoke_transformations/anthropic_claude3_transformation.py

@@ -525,6 +525,12 @@ class AmazonAnthropicClaudeMessagesConfig(
                 dropped_user_betas,
             )
 
+        # Opus 4.7+ has native 1M context on Bedrock — strip the legacy beta
+        if any(
+            p in model.lower() for p in ("opus-4.7", "opus_4.7", "opus-4-7", "opus_4_7")
+        ):
+            filtered_betas = [b for b in filtered_betas if b != "context-1m-2025-08-07"]
+
         return filtered_betas
 
     def _strip_unsupported_bedrock_invoke_fields(