OpenAI just dropped GPT‑5.1, and it’s already rolling out to ChatGPT Plus subscribers in two new modes: Instant and Thinking.

The Instant chat feature is a quick-thinking assistant offering faster answers, while Thinking is a slower, more thoughtful assistant best used for difficult or complex queries. With this latest rollout, users can now customize how ChatGPT responds, adjusting tone, humor, formality and even whether it uses emojis. For those who have ever wished ChatGPT automatically was less casual or chatty and sounded more professional, this update is for you. Time will tell how it compares to ChatGPT-5. For those who don't remember, that launch was a disaster.

Here’s everything that’s new in GPT‑5.1 — plus seven prompts to try right now.

What is GPT‑5.1?

GPT‑5.1 isn’t a full

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