[Bug] Anthropic API Error: Mismatched Opus reasoning effort

Resolved 💬 5 comments Opened Feb 14, 2026 by Majdoddin Closed Apr 10, 2026

Bug Description
opus says:

My current reasoning effort level is 50 (low). This is set internally by the system .... I'll be straightforward: I don't actually know why there's a mismatch. I was speculating. The fact is /model says high, but my internal reasoning budget feels set to a lower level. I can't diagnose further from my side — I just see what I'm given per message.

Although I have set the Reasoning Effort to high:

❯ /model                                                                                                                                                                          
──────────────────────────────────────────
 Select model                                                                                                                                                                     
 Switch between Claude models. Applies to this session and future Claude Code sessions. For other/previous model names, specify with --model.                                     
                                                                                                                                                                                  
   1. Default (recommended)  Use the default model (currently Sonnet 4.5) · $3/$15 per Mtok                                                                                       
 ❯ 2. Opus ✔                 Opus 4.6 · Most capable for complex work · $5/$25 per Mtok                                                                                           
   3. Opus (1M context)      Opus 4.6 for long sessions · $10/$37.50 per Mtok                                                                                                     
   4. Haiku                  Haiku 4.5 · Fastest for quick answers · $1/$5 per Mtok                                                                                               

 ▌▌▌ High effort (default) ← → to adjust

 Use /fast to turn on Fast mode (Opus 4.6 only). Now 50% off through Feb 16.

 Enter to confirm · Esc to exit

Environment Info

  • Platform: linux
  • Terminal: vscode
  • Version: 2.1.42
  • Feedback ID: f3fb0cac-6586-43ab-8a7b-5182c14f638c

Errors

[{"error":"Error: ENOENT: no such file or directory, open '~/.claude/remote-settings.json'\n    at openSync (unknown)\n    at <anonymous> (/$bunfs/root/claude:12:1109)\n    at JF (/$bunfs/root/claude:11:49471)\n    at readSync (/$bunfs/root/claude:12:1037)\n    at QF (/$bunfs/root/claude:6152:113)\n    at VJ (/$bunfs/root/claude:6154:226)\n    at EDA (/$bunfs/root/claude:183:138169)\n    at H8$ (/$bunfs/root/claude:183:138332)\n    at QI (/$bunfs/root/claude:183:140069)\n    at cn (/$bunfs/root/claude:184:2290)","timestamp":"2026-02-14T13:23:47.148Z"},...

Note: Content was truncated. using API on PC

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