Where does the bug appear (feature/product)? Cursor IDE Describe the Bug When using Bedrock, we get a 400, which makes sense: [image] Breaking changes - Migration guide This guide covers migrating Messages API code. If you use Claude Managed Agents, no changes beyond updating model name…

Hey, thanks for the report and for linking the migration guide, that confirms it. This is a bug on our side. We’re still sending the temperature parameter for Opus 4.7 on Bedrock, and that model no longer accepts it. I’ve flagged this with the team. No ETA yet, but your report helps us prioritize i…

+1 on this. Our team has to hard switch to Claude Code to try the new model. Would really appreciate a quick fix!

fwiw: the docs claim that model still accepts the params if they are set to the default values

Opus 4.7 not functioning on Bedrock because of Temperature deprecation / 400

Support Bug Reports

Colin (Colin) April 16, 2026, 7:59pm 11

This should be fixed now!

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Opus 4.7 not functioning on Bedrock because of Temperature deprecation / 400

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