GPT-5.1 Instant Blog
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
OpenAIโs GPT-5.1 Pro is the latest incremental release in the GPT-5 family: a production-grade model update that refines reasoning, latency/throughput
Nov 15, 2025
GPT-5.1 Instant
GPT-5.1-Chat-latest (GPT-5.1 Instant) API
OpenAIโs GPT-5.1 Instant is the low-latency variant of the newly released GPT-5.1 family (announced November 12, 2025). Itโs designed to deliver the โmost-usedโ 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 โthinkโ through harder queries.