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Error on session compaction on Opus 4.6 #17911
Description
Description
Getting this error on session compaction
undefined: The model returned the following errors: messages.3.content.1: thinking or redacted_thinking blocks in the latest assistant message cannot be modified. These blocks must remain as they were in the original response.
Plugins
oh-my-openagent
OpenCode version
No response
Steps to reproduce
- Start the agent install the oh-my-openagent plugin select Sisyphus (Ultraworker) agent.
- Give a prompt select Opus 4.6 connect via amazon-bedrock.
- Wait till context window reaches and trigged auto compaction
Screenshot and/or share link
No response
Operating System
macos Tahoe
Terminal
Opencode desktop
Reacted by KangSol, Ricardo D. Lahuerta and Tommi Laukkanen
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github-actions commentedon Mar 17, 2026
This issue might be a duplicate of existing issues. Please check:
Please review these issues and comment on one of them if your problem is the same, so we can consolidate tracking.
Jacko1394 commentedon Mar 22, 2026
Opus 4.6 works for one Plan pass, but then I always get Bad Request on the Build pass.
Jacko1394 commentedon Mar 31, 2026
Seems the same as: #13217
In the latest v1.3.9, when using Opus 4.6 via GitHub Copilot Enterprise, when the compaction occurs I hear an error sound, but no error shown.
Once that happens I cannot prompt any further, and can't change models either (previously that was a workaround) so the session cannot be used anymore.
@Hona Would you be able to help with this? 🥹
Jacko1394 commentedon Apr 13, 2026
Still blocking me: #11301 (comment)
Hona commentedon Apr 13, 2026
@Jacko1394 are you using opus 4.6 via github copilot auth?
Jacko1394 commentedon Apr 13, 2026
Yeah, GitHub Copilot Enterprise provider
github-actions commentedon Jul 3, 2026
To stay organized issues are automatically closed after 60 days of no activity. If the issue is still relevant please open a new one.