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Anthropic's Claude Opus 4.8 silently disables 'Thinking' feature

Users are reporting that Anthropic's Claude Opus 4.8 update appears to have disabled a "Thinking" feature without explicit notification. This change, noticed by some users over the past week, has led to confusion regarding response quality. The issue was identified and shared to help others experiencing similar unexpected changes in Claude's output. AI

IMPACT Users may experience unexpected changes in Claude's reasoning capabilities due to a silently disabled feature.

RANK_REASON User reports of a feature change in a released product.

Read on r/ClaudeAI →

AI-generated summary · Google Gemini · from 2 sources. How we write summaries →

Anthropic's Claude Opus 4.8 silently disables 'Thinking' feature

COVERAGE [2]

  1. r/Anthropic TIER_1 English(EN) · /u/BenAttanasio ·

    Opus 4.8 silently turned off my Thinking toggle

    <table> <tr><td> <a href="https://www.reddit.com/r/Anthropic/comments/1tzfsmo/opus_48_silently_turned_off_my_thinking_toggle/"> <img alt="Opus 4.8 silently turned off my Thinking toggle" src="https://preview.redd.it/v4ucm0c1uv5h1.png?width=640&amp;crop=smart&amp;auto=webp&amp;s=8…

  2. r/ClaudeAI TIER_2 English(EN) · /u/BenAttanasio ·

    Opus 4.8 silently turned off my Thinking toggle

    <table> <tr><td> <a href="https://www.reddit.com/r/ClaudeAI/comments/1tzft2o/opus_48_silently_turned_off_my_thinking_toggle/"> <img alt="Opus 4.8 silently turned off my Thinking toggle" src="https://preview.redd.it/lycwryt1uv5h1.png?width=640&amp;crop=smart&amp;auto=webp&amp;s=e7…