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OpenAI releases GPT-5.1, a new model in the GPT-5 series that dynamically adapts thinking time based on task complexity, offering 2-3x faster performance than GPT-5 while maintaining frontier intelligence. The release includes extended prompt caching (24-hour retention), new coding tools (apply_patch and shell), and a 'no reasoning' mode for latency-sensitive applications.
OpenAI releases GPT-5.1 Instant and GPT-5.1 Thinking models with improved conversational abilities and adaptive reasoning. The system card addendum documents safety mitigations including expanded evaluations for mental health and emotional reliance.