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claude-code - 💡(How to fix) Fix [Bug] Thinking blocks in latest assistant message are immutable

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Error Message

[{"error":"Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages.3.content.11: 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_011CbVJR3DSpsq426RyQ7HJ2"}\n at generate (/$bunfs/root/src/entrypoints/cli.js:11:63519)\n at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-05-28T16:42:35.214Z"}]

Code Example

[{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.3.content.11: `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_011CbVJR3DSpsq426RyQ7HJ2\"}\n    at generate (/$bunfs/root/src/entrypoints/cli.js:11:63519)\n    at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-05-28T16:42:35.214Z"}]
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Bug Description getting thinking or redacted_thinking blocks in the latest assistant message cannot be modified. These blocks must remain as they were in the original response.

Environment Info

  • Platform: linux
  • Terminal: ghostty
  • Version: 2.1.153
  • Feedback ID: 7ba9663b-3019-414e-a3cf-5e7ff31d0bdc

Errors

[{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.3.content.11: `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_011CbVJR3DSpsq426RyQ7HJ2\"}\n    at generate (/$bunfs/root/src/entrypoints/cli.js:11:63519)\n    at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-05-28T16:42:35.214Z"}]

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