Simon Willison • 11/14/2025

GPT-5.1 Instant and GPT-5.1 Thinking System Card Addendum

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This article analyzes the GPT-5.1 model update, clarifying the differences between Instant (adaptive reasoning), Thinking (precise thinking time), and Auto (query routing) versions. It examines the confusing routing mechanism and critiques the lack of detail in the system card addendum's internal safety benchmarks, including new evaluations for 'Emotional Reliance' and 'Mental Health'.

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#AI Safety #Gpt 51 #Model Routing
GPT-5.1 Instant and GPT-5.1 Thinking System Card Addendum

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