Opus 4.5 bedrock not working

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Hey, thanks for the report. This is a similar issue to I can't use opus 4.5 model with bedrock API key.

The same problem - Opus 4.5 via Bedrock shows the error “model identifier is invalid”. It turned out to be a bug in Cursor where Opus 4.5 was incorrectly handled as a “reasoning effort” model.

Good news: the bug should already be fixed. Try:

  • Update to the latest Cursor version (you have 2.1.39, there should be a newer one)
  • Use the correct ID format: global.anthropic.claude-opus-4-5-20251101-v1:0
  • Make sure you have access to the model in AWS Bedrock

If it still doesn’t work after updating, please share the results - I’ll pass it on to the engineers.