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

GPT-5.1 Instant offers better conversational ability and improved instruction-following compared to previous models, along with adaptive reasoning that lets it judge for itself how long to spend on reasoning. GPT-5.1 Thinking adjusts its thinking time even more precisely to fit the question. GPT-5.1 Auto automatically routes queries to the optimal model without requiring users to select a model themselves.

This addendum provides updated safety metrics for the new model versions. In particular, as part of the pre-deployment safety review, evaluations were expanded to cover mental health (delusions, psychosis, mania, etc.) and emotional reliance (unhealthy attachment to ChatGPT, etc.).