GPT-5.1 Instant Blog

What is GPT-5.1 Pro? A professional explainer and status report
Dec 2, 2025
GPT-5.1
GPT-5.1 Instant
GPT-5.1 Pro

What is GPT-5.1 Pro? A professional explainer and status report

OpenAI’s GPT-5.1 Pro is the latest incremental release in the GPT-5 family: a production-grade model update that refines reasoning, latency/throughput
GPT-5.1-Chat-latest (GPT-5.1 Instant) API
Nov 15, 2025
GPT-5.1 Instant

GPT-5.1-Chat-latest (GPT-5.1 Instant) API

OpenAI’s GPT-5.1 Instant is the low-latency variant of the newly released GPT-5.1 family (announced November 12, 2025). It’s designed to deliver the “most-used” ChatGPT experience with faster turn-taking, warmer conversational tone defaults, improved instruction following, and a built-in adaptive-reasoning capability that decides when to reply immediately and when to spend extra compute to “think” through harder queries.