claude-code - 💡(How to fix) Fix [BUG] web search is failing because adaptive thinking is not supported on opus 4.7

[{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/f/.local/share/claude/versions/2.1.114 (expected in multi-process scenarios)\n at sd_ (/$bunfs/root/src/entrypoints/cli.js:2751:2177)\n at WH8 (/$bunfs/root/src/entrypoints/cli.js:2751:1257)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-04-20T15:34:49.601Z"},{"error":"Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"adaptive thinking is not supported on this model"},"request_id":"req_011CaFGXsNoDZYCLtoB6sgYw"}\n at generate (/$bunfs/root/src/entrypoints/cli.js:11:53158)\n at makeRequest (/$bunfs/root/src/entrypoints/cli.js:50:4943)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-04-20T15:35:07.835Z"},{"error":"SyntaxError: JSON Parse error: Unexpected identifier "API"\n at <parse> (:0)\n at parse (unknown)\n at um8 (/$bunfs/root/src/entrypoints/cli.js:168:10030)\n at O (/$bunfs/root/src/entrypoints/cli.js:130:19438)\n at <anonymous> (/$bunfs/root/src/entrypoints/cli.js:170:1186)\n at KHH (/$bunfs/root/src/entrypoints/cli.js:6240:476)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-04-20T15:35:07.837Z"},{"error":"Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"adaptive thinking is not supported on this model"},"request_id":"req_011CaFKn7mTvAoDkA9YMUcs1"}\n at generate (/$bunfs/root/src/entrypoints/cli.js:11:53158)\n at makeRequest (/$bunfs/root/src/entrypoints/cli.js:50:4943)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-04-20T16:17:41.168Z"},{"error":"SyntaxError: JSON Parse error: Unexpected identifier "API"\n at <parse> (:0)\n at parse (unknown)\n at um8 (/$bunfs/root/src/entrypoints/cli.js:168:10030)\n at O (/$bunfs/root/src/entrypoints/cli.js:130:19438)\n at <anonymous> (/$bunfs/root/src/entrypoints/cli.js:170:1186)\n at KHH (/$bunfs/root/src/entrypoints/cli.js:6240:476)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-04-20T16:17:41.169Z"},{"error":"Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"adaptive thinking is not supported on this model"},"request_id":"req_011CaFL5cBEn42g2sbnwRYJF"}\n at generate (/$bunfs/root/src/entrypoints/cli.js:11:53158)\n at makeRequest (/$bunfs/root/src/entrypoints/cli.js:50:4943)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-04-20T16:21:38.416Z"},{"error":"SyntaxError: JSON Parse error: Unexpected identifier "API"\n at <parse> (:0)\n at parse (unknown)\n at um8 (/$bunfs/root/src/entrypoints/cli.js:168:10030)\n at O (/$bunfs/root/src/entrypoints/cli.js:130:19438)\n at <anonymous> (/$bunfs/root/src/entrypoints/cli.js:170:1186)\n at KHH (/$bunfs/root/src/entrypoints/cli.js:6240:476)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-04-20T16:21:38.417Z"},{"error":"Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"Thinking may not be enabled when tool_choice forces tool use."},"request_id":"req_011CaFL6KjJgDWV9axTfC4WT"}\n at generate (/$bunfs/root/src/entrypoints/cli.js:11:53158)\n at makeRequest (/$bunfs/root/src/entrypoints/cli.js:50:4943)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-04-20T16:21:48.172Z"},{"error":"Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"Thinking may not be enabled when tool_choice forces tool use."},"request_id":"req_011CaFL6MMXsQotk3g5mMUxA"}\n at generate (/$bunfs/root/src/entrypoints/cli.js:11:53158)\n at makeRequest (/$bunfs/root/src/entrypoints/cli.js:50:4943)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-04-20T16:21:48.492Z"},{"error":"Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"Thinking may not be enabled when tool_choice forces tool use."},"request_id":"req_011CaFL6R4HPeQBBKoJuEP7w"}\n at generate (/$bunfs/root/src/entrypoints/cli.js:11:53158)\n at makeRequest (/$bunfs/root/src/entrypoints/cli.js:50:4943)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-04-20T16:21:49.430Z"},{"error":"Error: 400 {"type":"error","error":{"type":\…

TL;DR

The most likely fix is to disable adaptive thinking or use a different model that supports it, as the current model (opus 4.7) does not support adaptive thinking.

Guidance

• Check the documentation for the opus model version 4.7 to confirm that adaptive thinking is not supported.
• Consider using a different model version that supports adaptive thinking, if available.
• If adaptive thinking is not essential for the current task, disable it to avoid the error.
• Review the request parameters to ensure that tool_choice is not forcing tool use, as this may also cause errors with thinking enabled.

Example

No code example is provided as the issue is related to model compatibility and configuration rather than code syntax.

Notes

The provided error messages and environment information suggest that the issue is related to the opus model version and its compatibility with adaptive thinking. However, the content was truncated, which may limit the ability to provide a comprehensive solution.

Recommendation

Apply workaround: Disable adaptive thinking or use a different model that supports it, as the error messages clearly indicate that the current model (opus 4.7) does not support adaptive thinking.