Where does the bug appear (feature/product)? Cursor IDE Describe the Bug just like in 4.7: Opus 4.7 not functioning on Bedrock because of Temperature deprecation / 400 - #12 . switching to 4.7 works. Steps to Reproduce use aws bedrock credentials enable us.anthropic.claude-opus-4-8 try to send a …

Hey, this is a known bug, same as the one we had with Opus 4.7 on Bedrock. It’s already been reported internally, but there’s no fix timeline yet. As a workaround, stay on Opus 4.7 for now, requests go through there like you already noticed. Once 4.8 is fixed, we’ll reply in the thread.

Opus 4.8 with bedrock errors out saying `temperature` is deprecated

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Topic		Replies	Views
Opus 4.7 not functioning on Bedrock because of Temperature deprecation / 400 Bug Reports nightly , byok , anthropic	4	1764	April 16, 2026
Opus 4.8 on AWS Bedrock does not work Bug Reports byok , anthropic , linear-linked	9	512	May 29, 2026
Opus 4.8 via Bedrock: "temperature" is deprecated for this model Bug Reports byok , anthropic , linear-linked	8	427	May 29, 2026
Bug: Bedrock: model not found Bug Reports byok , anthropic	1	306	February 19, 2026
Fable-5 via AWS Bedrock not working Bug Reports byok , anthropic	1	258	June 10, 2026

Opus 4.8 with bedrock errors out saying `temperature` is deprecated

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