product · inferred from evidence
bedrock-mantle/openai.gpt-6-astra
A specific model identifier on the Bedrock Mantle platform.
- Strands Agents: 400 Failed to deserialize the JSON body ... unknown variant 'web_search' on Bedrock Mantle GPT-5/6
This was a real bug, fixed in the harness in PR #4489. The fix stops sending the unsupported native web_search tool to Bedrock Mantle models and makes an explicit web_search: "exa" selection correctly override native search, with cross-SDK