[Bug] Opus 4.5 Anthropic API Error: Cannot modify thinking blocks in assistant messages

Status Closed — duplicate
Maintainer reply None cached
Activity 3 comments · opened Nov 26, 2025 · 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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