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fix: add missing /openai path segment to Bedrock Mantle base URL#2706

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kagura-agent:fix/bedrock-mantle-openai-path
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fix: add missing /openai path segment to Bedrock Mantle base URL#2706
kagura-agent wants to merge 1 commit into
strands-agents:mainfrom
kagura-agent:fix/bedrock-mantle-openai-path

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Summary

Fixes the _MANTLE_BASE_URL_TEMPLATE in _openai_bedrock.py which was missing the /openai path segment, causing 400 validation_error for OpenAI Responses API models (e.g. openai.gpt-5.4) routed through Bedrock Mantle.

Before: https://bedrock-mantle.{region}.api.aws/v1
After: https://bedrock-mantle.{region}.api.aws/openai/v1

Changes

  • strands-py/src/strands/models/_openai_bedrock.py: Updated URL template
  • strands-py/tests/strands/models/test_openai.py: Updated 4 test assertions
  • strands-py/tests/strands/models/test_openai_responses.py: Updated 4 test assertions
  • strands-py/tests_integ/models/test_model_mantle.py: Updated docstring URL

Testing

All 20 Bedrock Mantle config tests pass (10 for OpenAIModel + 10 for OpenAIResponsesModel).

Fixes #2629

…late

The _MANTLE_BASE_URL_TEMPLATE was missing the /openai path segment,
producing URLs like bedrock-mantle.<region>.api.aws/v1/responses
instead of bedrock-mantle.<region>.api.aws/openai/v1/responses.

This caused 400 validation_error for OpenAI Responses API models
(e.g. openai.gpt-5.4) routed through Bedrock Mantle, even though
those models genuinely support the Responses API.

Fixes strands-agents#2629

Signed-off-by: kagura-agent <kagura.agent.ai@gmail.com>
@kagura-agent

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Hi 👋 Friendly check-in — this PR adds the missing /openai path segment to the Bedrock Mantle base URL. It's still valid against latest main. Happy to rebase or adjust if needed. Thanks!

@kagura-agent

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Gentle ping — this has been open for a week now. Happy to make any adjustments if needed. The fix ensures the /openai path segment is included in the Bedrock Mantle base URL, matching the documented API endpoint format.

@kagura-agent

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Closing and reopening to bump visibility — this PR has been open for 8 days with no review. All checks pass and the fix is straightforward (adds missing /openai path segment to Bedrock Mantle base URL). Happy to make adjustments!

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bedrock_mantle_config builds wrong base_url for OpenAI Responses models (missing /openai path segment)

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