Claude Opus 5.5 makes thinking always-on; legacy prompts need rewrites
minchoi · x · 2026-10-28
Tip #2: Opus 5.5 no longer supports disabling thinking. If you previously used thinking-disabled mode, start at low effort and remove prompts that force Claude to write out its internal reasoning.
Related event: Anthropic publishes official prompting best practices for Claude Opus 5.5(13 posts)→
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