Open AI announces ChatGPT 5.1

Daniel Morrisey  November 12, 2025
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GPT-5.1 and OpenAI text on colorful gradient background with pink, yellow, and blue tones https://writing.madebydanny.uk/open-ai-announces-chatgpt-5-1-0432a0e784e2 External Link • writing.madebydanny.uk

On Wednesday OpenAI announced GPT 5.1, what OpenAI is calling an "upgrade" to GPT 5 which was announced back in August (2025), and OpenAI claims the new model, GPT 5.1 "makes ChatGPT smarter and more enjoyable to talk to".

Mobile app personalization screen showing style options including Default, Professional, Friendly, Candid, Quirky, Efficient, Nerdy, and Cynical.

The new models are GPT-5.1 Instant and GPT-5.1 thinking. Alongside the release of the new models comes with new conversation tones. The list of tones now include Default, Professional, Friendly, Candid, Quirky, Efficient, Nerdy, and Cynical.

The release of GPT 5.1 comes just weeks after OpenAI announced its AI-powered web browser, ChatGPT Atlas.

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