As described in our blog⁠, GPT‑5.1 Instant and GPT‑5.1 Thinking are the next iteration of our GPT‑5 models. GPT‑5.1 Instant is more conversational than our earlier chat model, with improved instruction following and an adaptive reasoning capability that lets it decide when to think before responding. GPT‑5.1 Thinking adapts thinking time more precisely to each question. GPT‑5.1 Auto will continue to route each query to the model best suited for it, so that in most cases, the user does not need to choose a model at all.

ChatGPT 5.1: Smarter, Faster & More Human – Complete AI Upgrade Guide

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