Bug: Codex generates incorrect Amazon Bedrock Mantle endpoint
Open 💬 0 comments Opened Aug 6, 2026 by shobhit-barua
What version of the Codex App are you using (From “About Codex” dialog)?
Version 26.730.61639
What subscription do you have?
free
What platform is your computer?
windows x64
What issue are you seeing?
Generated by Codex:
https://bedrock-mantle.ap-south-1.api.aws/openai/v1/responses
unexpected status 401 Unauthorized: The security token included in the request is invalid., url: https://bedrock-mantle.ap-south-1.api.aws/openai/v1/responses, request id: req_cvrakpk7f46eflkscjlacdsxm7xadylrkm3swgweroy2cajbcnma
What steps can reproduce the bug?
model = "openai.gpt-oss-120b"
model_provider = "amazon-bedrock"
model_reasoning_effort = "medium"
[model_providers.amazon-bedrock.aws]
wire_api = "responses"
What is the expected behavior?
Expected by Amazon Bedrock Mantle:
https://bedrock-mantle.ap-south-1.api.aws/v1/responses
As a result, requests fail because the generated endpoint does not match the current Bedrock Mantle API.
Additional information
_No response_