claude-code - 💡(How to fix) Fix [Performance] Claude 3.5 Opus regression: Reduced problem-solving capability compared to previous versions [1 comments, 1 participants]

[{"error":"CanceledError: canceled\n at W (/$bunfs/root/src/entrypoints/cli.js:115:7109)\n at abort (unknown)\n at C$9 (/$bunfs/root/src/entrypoints/cli.js:817:3782)\n at abort (unknown)\n at C$9 (/$bunfs/root/src/entrypoints/cli.js:817:3782)\n at abort (unknown)\n at qPH (/$bunfs/root/src/entrypoints/cli.js:8393:7413)\n at <anonymous> (/$bunfs/root/src/entrypoints/cli.js:8355:4761)\n at <anonymous> (/$bunfs/root/src/entrypoints/cli.js:621:9125)\n at <anonymous> (/$bunfs/root/src/entrypoints/cli.js:527:4981)\n at request (/$bunfs/root/src/entrypoints/cli.js:117:2467)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-04-30T21:33:45.351Z"}]

TL;DR

Downgrade to Opus 4.6 to potentially restore the ability to find solutions without the optimizations introduced in version 4.7.

Guidance

• The error message "CanceledError: canceled" suggests an issue with the operation being canceled, possibly due to optimizations in Opus 4.7.
• Compare the behavior of Opus 4.6 and 4.7 with the same input to verify if the issue is indeed caused by the version change.
• Test Opus 4.7 with different optimization settings, if available, to see if it affects the ability to find solutions.
• Check if there are any known issues or discussions related to Opus 4.7 optimizations that may provide more insight or temporary workarounds.

Notes

The provided information does not specify the exact optimizations made in Opus 4.7, so it's uncertain which specific changes are causing the issue.

Recommendation

Apply workaround: Downgrade to Opus 4.6, as it is reported to work correctly, while waiting for potential fixes or more information on how to properly use Opus 4.7 without its optimizations crippling the solution-finding ability.