OpenAI has launched two new models: GPT-5.1 Instant and GPT-5.1 Thinking.
Both models are designed to make ChatGPT smarter, faster, and more enjoyable to use.
OpenAI is also adding new customisation options so users can shape ChatGPT’s tone and personality more easily.
OpenAI has announced a major update to ChatGPT with the launch of the new GPT-5.1 models. The upgrade includes two models: GPT-5.1 Instant and GPT-5.1 Thinking. Both models are designed to make the chatbot smarter, faster, and more enjoyable to use. According to OpenAI, GPT‑5.1 “improves meaningfully on both intelligence and communication style.”
SurveyThe GPT-5.1 Instant model is more conversational and friendly than its predecessor. It better understands instructions and gives clearer, more accurate answers. It also uses adaptive reasoning, which means it can decide when to “think” longer before answering harder questions.
The GPT-5.1 Thinking model can adjust its thinking time based on how complex a question is. This means that it will spend more time on challenging problems but reply faster to simple ones. “GPT‑5.1 Thinking’s responses are also clearer, with less jargon and fewer undefined terms,” OpenAI says.
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Both models are being rolled out gradually, starting with paid users on ChatGPT Plus, Pro, Go, Business, and Enterprise plans, before reaching free users.
Alongside the new models, OpenAI is adding new customisation options so users can shape ChatGPT’s tone and personality more easily. Updated style presets now include Default, Friendly, Efficient, Professional, Candid, and Quirky, while older options like Cynical and Nerdy remain available.
The company is also experimenting with the ability to fine-tune ChatGPT’s characteristics directly, such as how warm, concise, or expressive it is, and even how often it uses emojis.
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“GPT‑5.1 updates and new customisation options are a step toward a ChatGPT that feels like it fits you—smarter, more enjoyable to talk to, and more adaptable to your preferences,” OpenAI explains.
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Ayushi Jain
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