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claude-code - 💡(How to fix) Fix [Bug] Anthropic API Error: Invalid Request (HTTP 400)

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Error Message

[{"error":"Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages.1.content.12: 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_011CbVqGzVNnGTAqPvXkHjnb"}\n at generate (/$bunfs/root/src/entrypoints/cli.js:11:63571)\n at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-05-28T23:27:17.571Z"},{"error":"Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages.1.content.12: 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_011CbVqKTKxu3utbCWsm33Mz"}\n at generate (/$bunfs/root/src/entrypoints/cli.js:11:63571)\n at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-05-28T23:27:50.976Z"},{"error":"Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages.1.content.12: 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_011CbVqLbtBxitsdTqZPqeG9"}\n at generate (/$bunfs/root/src/entrypoints/cli.js:11:63571)\n at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-05-28T23:28:06.744Z"}]

Code Example

[{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.1.content.12: `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_011CbVqGzVNnGTAqPvXkHjnb\"}\n    at generate (/$bunfs/root/src/entrypoints/cli.js:11:63571)\n    at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-05-28T23:27:17.571Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.1.content.12: `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_011CbVqKTKxu3utbCWsm33Mz\"}\n    at generate (/$bunfs/root/src/entrypoints/cli.js:11:63571)\n    at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-05-28T23:27:50.976Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.1.content.12: `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_011CbVqLbtBxitsdTqZPqeG9\"}\n    at generate (/$bunfs/root/src/entrypoints/cli.js:11:63571)\n    at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-05-28T23:28:06.744Z"}]
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Bug Description Session bricked itself with Error 400

Environment Info

  • Platform: linux
  • Terminal: xterm-256color
  • Version: 2.1.154
  • Feedback ID: c192642f-3797-4608-ab96-7375a7963e41

Errors

[{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.1.content.12: `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_011CbVqGzVNnGTAqPvXkHjnb\"}\n    at generate (/$bunfs/root/src/entrypoints/cli.js:11:63571)\n    at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-05-28T23:27:17.571Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.1.content.12: `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_011CbVqKTKxu3utbCWsm33Mz\"}\n    at generate (/$bunfs/root/src/entrypoints/cli.js:11:63571)\n    at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-05-28T23:27:50.976Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.1.content.12: `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_011CbVqLbtBxitsdTqZPqeG9\"}\n    at generate (/$bunfs/root/src/entrypoints/cli.js:11:63571)\n    at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-05-28T23:28:06.744Z"}]

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