[Bug] Opus 4.5 Anthropic API Error: Cannot modify thinking blocks in assistant messages
Resolved 💬 3 comments Opened Nov 26, 2025 by Soein Closed Nov 29, 2025
Bug Description
API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages.9.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."},"request_id":"req_011CVVkmfs6x41zV3uCAdmJh"}
Environment Info
- Platform: darwin
- Terminal: Tabby
- Version: 2.0.54
- Feedback ID: 09739c35-bba6-42dd-bfff-9032bf2727c4
- model:Opus 4.5
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