bug: aws bedrock prompt caching doesn't work correctly #11662

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1. rgodha24

   added

   bugSomething isn't workingSomething isn't working

   on Feb 1, 2026
2. github-actions

   assigned

   thdxr

   on Feb 1, 2026
3. github-actions commented on Feb 1, 2026

   

   github-actionsBot

   on Feb 1, 2026 – with GitHub Actions

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   This issue might be a duplicate of existing issues. Please check:

   • Excessive input token usage with Sonnet on AWS Bedrock #10066: Excessive input token usage with Sonnet on AWS Bedrock (describes the same 10x cost increase and indicates tool outputs are being repeatedly included)
   • Claude w/ bedrock custom inference profile - no caching #9803: Claude w/ bedrock custom inference profile - no caching (directly addresses bedrock prompt caching detection issues)
   • Due to the lack of userId and sessionId, some models will not hit the cache. #8623: Due to the lack of userId and sessionId, some models will not hit the cache (related to cache metadata)
   • The Claude model cannot properly enable the caching function #11083: The Claude model cannot properly enable the caching function (related to caching detection with Claude)

   Feel free to ignore if none of these address your specific case.
4. rekram1-node

   assigned

   rekram1-node

   and unassigned

   thdxr

   on Feb 1, 2026
5. rekram1-node

   closed this as completedin #11664on Feb 1, 2026
6. thevinchi commented on Feb 6, 2026

   

   thevinchi

   on Feb 6, 2026

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   This has been working great, but the same behavior is back when attempting to use Opus 4.6 on bedrock. I assume I should open a new issue?
7. thevinchi commented on Feb 6, 2026

   

   thevinchi

   on Feb 6, 2026

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   Nevermind, I had not updated opencode to the latest version in the environment where we were testing Opus 4.6. 🤦‍♂️