Opus 4.6 with beta string "anthropicBeta": ["context-1m-2025-08-07"] stopped working in AWS Bedrock #16486

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1. SpotlightForBugs

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   bugSomething isn't workingSomething isn't working

   on Mar 7, 2026
2. github-actions

   assigned

   rekram1-node

   on Mar 7, 2026
3. github-actions

   added

   coreAnything pertaining to core functionality of the application (opencode server stuff)Anything pertaining to core functionality of the application (opencode server stuff)

   on Mar 7, 2026
4. github-actions commented on Mar 7, 2026

   

   github-actionsbot

   on Mar 7, 2026 – with GitHub Actions

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

   • Amazon Bedrock Opus 4.6 compaction failure #14332: Amazon Bedrock Opus 4.6 compaction failure — same model, same errors about thinking/redacted_thinking blocks cannot be modified during compaction
   • Auto-compact fails for Bedrock-hosted Claude models due to incorrect context limit #16356: Auto-compact fails for Bedrock-hosted Claude models due to incorrect context limit — Opus 4.6 on Bedrock hitting 200k limit with same compaction errors (closed with workaround)
   • Split Bedrock Claude Opus 4.6 into 200K + 1M models and set 1M beta flag #13199: Split Bedrock Claude Opus 4.6 into 200K + 1M models and set 1M beta flag — directly related to the context-1m-2025-08-07 beta flag behavior
   • ValidationException: text content blocks must be non-empty when using Bedrock Runtime #15715: ValidationException: text content blocks must be non-empty when using Bedrock Runtime — same "content field is empty" class of error
5. sergical

   added a commit that references this issue on Mar 11, 2026

   fix(provider): resolve bedrock compaction failures for Claude models

   ...

   This issue will close once commit d798082 is merged into the 'dev' branch.

   d798082
6. thdxr

   removed

   bugSomething isn't workingSomething isn't working

   coreAnything pertaining to core functionality of the application (opencode server stuff)Anything pertaining to core functionality of the application (opencode server stuff)

   on May 3, 2026
7. github-actions commented on Jul 3, 2026

   

   github-actionsbot

   on Jul 3, 2026 – with GitHub Actions

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   To stay organized issues are automatically closed after 60 days of no activity. If the issue is still relevant please open a new one.
8. github-actions

   closed this as not plannedon Jul 3, 2026