Unverified50% confidenceFactExact time
Opus 5 enables Extended Thinking by default; thinking can only be disabled at effort levels of high or below, and the official guidance strongly recommends not disabling thinking.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
8/29/2026
First Seen
Valid until: 11/27/2026
Sources
Related Entities
Related Claims
UnverifiedThe author recommends disabling thinking, on the grounds that most use cases for building agents or simple applications do not require deep reasoning, and LangChain's compatibility with thinking mode is not yet complete.66% similarUnverifiedAnthropic changed the default settings by disabling adaptive thinking, enabling sanitized thinking, and reducing the default thinking effort, resulting in approximately a 67% decrease in thinking depth61% similarUnverifiedUltra mode is fundamentally different from increasing reasoning intensity; higher reasoning intensity means having a single agent spend more time thinking.61% similarUnverifiedThinking mode should remain enabled for math, code, and complex logical tasks, while it should be disabled or depth-limited for routine Q&A and conversation.60% similarUnverifiedStandard reasoning mode does not use long chain-of-thought, and token consumption is typically one-tenth or even less than that of high reasoning mode.59% similar
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