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17 November 2025
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Loading...OpenAI has just released GPT-5.1, a significant update to the GPT-5 series of models powering ChatGPT. While it is not a revolutionary leap on the scale of a new generation like GPT-6, the changes are profound and focus on what matters most to users: intelligence, communication style, and personalization.
The update, which is already rolling out to users (starting with paid plans), introduces two refreshed models and new ways to tailor the tone of responses. Let’s see exactly what has changed.
OpenAI is introducing not just one, but two updated models, each optimized for different tasks.
This is the model most users rely on. According to OpenAI, version 5.1 Instant is now “warmer,” more intelligent, and much better at following instructions.
Key changes in GPT-5.1 Instant:
This is a more powerful model designed for the most complex tasks. In version 5.1, OpenAI focused on making it more accessible and efficient.
Key changes in GPT-5.1 Thinking:
Alongside the updated models themselves, OpenAI is introducing new, intuitive tools for shaping ChatGPT’s personality.
Users now have access to new predefined tone options designed to better meet real needs:
These options complement the updated versions of Default, Friendly (formerly Listener), and Efficient (formerly Robot).
More importantly, OpenAI is experimenting with the ability to tune model traits with even greater granularity directly in the settings. Users will be able to influence how concise, warm, or accessible (e.g., in terms of text scanning) responses should be and how often the model uses emojis.
A key change is that all personalization changes (including custom instructions) now take effect immediately, even in ongoing conversations.
Early tests confirm that the most noticeable change is the speed and smoothness of GPT-5.1 Instant. The model generates text with fewer pauses, making the interaction feel more natural.
Tests also confirm that the models are much better at following instructions and avoiding jargon. In one test, GPT-5.1 explained the “Ship of Theseus” paradox in a much more accessible and conversational way than its predecessor.
Interestingly, the new model appears to be more empathetic. When asked for advice about stress or feeling unwell (e.g., after spilling coffee before a meeting), GPT-5.1 first acknowledges and validates the user’s feelings before offering solutions. This small thing drastically improves the quality of conversation.
GPT-5.1 (Instant and Thinking) is initially being rolled out to users of paid plans (Pro, Plus, Go, Business) and then to free users. The models will also be available via the API soon.
Though the “5.1” name suggests only an iteration, it is one of the most important ChatGPT updates in a long time. OpenAI clearly prioritized usability — the model is not only smarter but also faster, more pleasant to use, and more reliable in executing commands.
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Source of information on GPT-5.1: https://openai.com/index/gpt-5-1/
