tech
December 8, 2025
GPT-5.1: A smarter, more conversational ChatGPT
We’re upgrading GPT‑5 while making it easier to customize ChatGPT. Starting to roll out today to everyone, beginning with paid users.
TL;DR
- GPT-5.1 Instant is now warmer, more conversational, and better at following instructions, with improved performance on math and coding evaluations.
- GPT-5.1 Thinking is more efficient, faster on simple tasks, and clearer, making it more approachable for complex topics.
- New customization options allow users to easily adjust ChatGPT's tone and style with presets like Default, Friendly, Efficient, Professional, Candid, and Quirky.
- Users can experiment with finetuning specific characteristics like conciseness, warmth, and emoji usage.
- Updates to personalization settings now apply immediately across all chats, including ongoing conversations.
- GPT-5.1 models will gradually roll out to paid users first, followed by free and logged-out users.
- GPT-5.1 models will be available via API later this week.
- Legacy GPT-5 models will remain available for paid subscribers for three months for comparison and adaptation.
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