Three months after the launch of GPT 5 with faster and more reliable responses, OpenAI has today started rolling out GPT 5.1 in ChatGPT for paid users with the API coming later this week.
The GPT 5.1 Instant model is comparatively warmer, more intelligent, and conversational according to OpenAI. GPT 5.1 Instant is now also better at following instructions after this update. Moreover, the update also includes ‘Adaptive Reasoning’ for this model. According to OpenAI, “For the first time, GPT‑5.1 Instant can use adaptive reasoning to decide when to think before responding to more challenging questions, resulting in more thorough and accurate answers, while still responding quickly.”
On the other hand, the GPT 5.1 Thinking model is now faster and more efficient at tasks as it ‘spends less time on easy tasks, and more time on hard tasks, according to OpenAI. The responses contain fewer jargons and undefined terms, and similar to GPT 5.1 Instant, the Thinking model is warmer and empathetic.
Similar to GPT 5, the new update also features GPT 5.1 Auto to decide which model works best for your query. Both the Instant and Thinking models of GPT 5 will be available under ‘Legacy Models’ for three months for paying customers.
In addition to these updates, OpenAI has also refined and added new preset options for the tone of ChatGPT responses. According to OpenAI, “Earlier this year, we added preset options to tailor the tone of how ChatGPT responds. Today, we’re refining those options to better reflect the most common ways people use ChatGPT. Default, Friendly (formerly Listener), and Efficient (formerly Robot) remain (with updates), and we’re adding Professional, Candid, and Quirky. These options are designed to align with what we’ve learned about how people naturally steer the model, making it quick and intuitive to choose a personality that feels uniquely right. These personality settings apply across all models. The original Cynical (formerly Cynic) and Nerdy (formerly Nerd) options we introduced earlier this year will remain available unchanged under the same dropdown in personalization settings.”
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