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

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Error Message

[{"error":"Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages.1.content.9: 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_011CbVprDrbQQ5SUj4Xp5gdw"}\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":"2026-05-28T23:21:41.607Z"},{"error":"Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages.1.content.9: 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_011CbVpwixwpU54DQVY4K72f"}\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":"2026-05-28T23:22:56.101Z"},{"error":"Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages.1.content.9: 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_011CbVq1cMSWVR1YHaBzqk5L"}\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":"2026-05-28T23:23:48.824Z"},{"error":"Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"},"request_id":"req_011CbWqZCeKKJ73uHnKEDZCo"}\n at generate (/$bunfs/root/src/entrypoints/cli.js:11:63829)\n at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-05-29T12:11:34.938Z"},{"error":"Error: Tool bash not found\n at x54 (/$bunfs/root/src/entrypoints/cli.js:4036:14129)\n at vz (/$bunfs/root/src/entrypoints/cli.js:580:21150)\n at qj (/$bunfs/root/src/entrypoints/cli.js:580:39922)\n at SKH (/$bunfs/root/src/entrypoints/cli.js:580:50731)\n at b8 (/$bunfs/root/src/entrypoints/cli.js:580:87760)\n at IKH (/$bunfs/root/src/entrypoints/cli.js:580:86726)\n at Wn (/$bunfs/root/src/entrypoints/cli.js:580:86546)\n at rC (/$bunfs/root/src/entrypoints/cli.js:580:82882)\n at Y$ (/$bunfs/root/src/entrypoints/cli.js:580:6440)\n at lw6 (/$bunfs/root/src/entrypoints/cli.js:573:5415)","timestamp":"2026-05-29T13:59:25.638Z"},{"error":"Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages.1.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_011CbXWUhVJXmx4MMs8vYBDw"}\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":"2026-05-29T20:41:57.989Z"},{"error":"Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages.1.content.8: 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_011CbXkC5Q5zvAEEsApBEnTd"}\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":"2026-05-29T23:41:48.003Z"},{"error":"Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages.1.content.8: 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_011CbXkJq3prjS1r4CpTWuNX"}\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":"2026-05-29T23:43:19.819Z"},{"error":"Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages.1.content.4…

Code Example

[{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.1.content.9: `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_011CbVprDrbQQ5SUj4Xp5gdw\"}\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":"2026-05-28T23:21:41.607Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.1.content.9: `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_011CbVpwixwpU54DQVY4K72f\"}\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":"2026-05-28T23:22:56.101Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.1.content.9: `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_011CbVq1cMSWVR1YHaBzqk5L\"}\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":"2026-05-28T23:23:48.824Z"},{"error":"Error: 500 {\"type\":\"error\",\"error\":{\"type\":\"api_error\",\"message\":\"Internal server error\"},\"request_id\":\"req_011CbWqZCeKKJ73uHnKEDZCo\"}\n    at generate (/$bunfs/root/src/entrypoints/cli.js:11:63829)\n    at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-05-29T12:11:34.938Z"},{"error":"Error: Tool bash not found\n    at x54 (/$bunfs/root/src/entrypoints/cli.js:4036:14129)\n    at vz (/$bunfs/root/src/entrypoints/cli.js:580:21150)\n    at qj (/$bunfs/root/src/entrypoints/cli.js:580:39922)\n    at SKH (/$bunfs/root/src/entrypoints/cli.js:580:50731)\n    at b8 (/$bunfs/root/src/entrypoints/cli.js:580:87760)\n    at IKH (/$bunfs/root/src/entrypoints/cli.js:580:86726)\n    at Wn (/$bunfs/root/src/entrypoints/cli.js:580:86546)\n    at rC (/$bunfs/root/src/entrypoints/cli.js:580:82882)\n    at Y$ (/$bunfs/root/src/entrypoints/cli.js:580:6440)\n    at lw6 (/$bunfs/root/src/entrypoints/cli.js:573:5415)","timestamp":"2026-05-29T13:59:25.638Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.1.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_011CbXWUhVJXmx4MMs8vYBDw\"}\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":"2026-05-29T20:41:57.989Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.1.content.8: `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_011CbXkC5Q5zvAEEsApBEnTd\"}\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":"2026-05-29T23:41:48.003Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.1.content.8: `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_011CbXkJq3prjS1r4CpTWuNX\"}\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":"2026-05-29T23:43:19.819Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.1.content.4
RAW_BUFFERClick to expand / collapse

Bug Description api error 400

Environment Info

  • Platform: linux
  • Terminal: tmux
  • Version: 2.1.154
  • Feedback ID: 7733e20c-e192-4271-84f8-1d9f78840fa3

Errors

[{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.1.content.9: `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_011CbVprDrbQQ5SUj4Xp5gdw\"}\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":"2026-05-28T23:21:41.607Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.1.content.9: `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_011CbVpwixwpU54DQVY4K72f\"}\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":"2026-05-28T23:22:56.101Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.1.content.9: `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_011CbVq1cMSWVR1YHaBzqk5L\"}\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":"2026-05-28T23:23:48.824Z"},{"error":"Error: 500 {\"type\":\"error\",\"error\":{\"type\":\"api_error\",\"message\":\"Internal server error\"},\"request_id\":\"req_011CbWqZCeKKJ73uHnKEDZCo\"}\n    at generate (/$bunfs/root/src/entrypoints/cli.js:11:63829)\n    at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-05-29T12:11:34.938Z"},{"error":"Error: Tool bash not found\n    at x54 (/$bunfs/root/src/entrypoints/cli.js:4036:14129)\n    at vz (/$bunfs/root/src/entrypoints/cli.js:580:21150)\n    at qj (/$bunfs/root/src/entrypoints/cli.js:580:39922)\n    at SKH (/$bunfs/root/src/entrypoints/cli.js:580:50731)\n    at b8 (/$bunfs/root/src/entrypoints/cli.js:580:87760)\n    at IKH (/$bunfs/root/src/entrypoints/cli.js:580:86726)\n    at Wn (/$bunfs/root/src/entrypoints/cli.js:580:86546)\n    at rC (/$bunfs/root/src/entrypoints/cli.js:580:82882)\n    at Y$ (/$bunfs/root/src/entrypoints/cli.js:580:6440)\n    at lw6 (/$bunfs/root/src/entrypoints/cli.js:573:5415)","timestamp":"2026-05-29T13:59:25.638Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.1.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_011CbXWUhVJXmx4MMs8vYBDw\"}\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":"2026-05-29T20:41:57.989Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.1.content.8: `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_011CbXkC5Q5zvAEEsApBEnTd\"}\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":"2026-05-29T23:41:48.003Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.1.content.8: `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_011CbXkJq3prjS1r4CpTWuNX\"}\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":"2026-05-29T23:43:19.819Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.1.content.4

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