What’s new and what improvements are there in the new version of the ChatGPT model with two personalities

Let’s tell you What’s new in GPT-5.1the new version of the model artificial intelligence of ChatGPT. GPT versions are the engine of your interactions with OpenAI’s AI, and the results that are given to you and the way in which they are told to you depend on them.

This new update stands out above all for having two versions with different personalities. But in addition to this, there are also other new features that go more under the hood, but that can also make a difference when it comes to serving you the answers.

Here, you must be clear that this new version of GPT-5.1 It has reached paying users firstwhether they have a Plus, Pro, Go or Business subscription. Maybe later it will also reach free users, but probably with limited use.

Two GPT-5.1 with two ways to respond

As we have told you, the main novelty of this new update is that it offers two versions with different personalities. This goes beyond customize ChatGPT with different personalities as you can do in the settings, but there are directly two versions of GPT-5.1, and each of them has a different type of response.

On the one hand it is GPT-5.1 Instantwhich is more conversational and with more “warm” or close responses. and then you have GPT-5.1 Thinkingthat use clearer language with less jargon. This last model is trained for deep reasoning, and responds faster on simple tasks, while dedicating more thinking time to complex ones.

Paid ChatGPT users will see the ChatGPT 5.1 model activated at the top. By clicking on the name the model selector will open, and in it you can choose between the variants instant and thinking. There is also a way Car which will choose for you which of the two variants to use depending on what you ask in the prompt.

Smarter adaptive reasoning

GPT-5.1 also improves its internal logic, and now dynamically decides the “thinking time” that you dedicate to a request. Come on, instead of dedicating the same time to each of them, you will dedicate different times depending on the type of request.

This way, when you make a simple query it will be processed with minimal calculation and faster, while more advanced reasoning tasks receive additional layers of analysis to improve the results and make them more coherent and context-sensitive.

Behavioral improvements and instructions

This new model too improves following instructionsbetter “understanding” what you ask and generating responses that are more aligned with it. Each of the two variants adjusts its reasoning to the complexity of the request to ensure that the answers are consistent with everything you ask of them.

Better tone and personality controls

We already told you that ChatGPT has a setting to determine the tone and personality of the responses. Now, instead of having predefined ringtones the user can configure it. For example, you can choose to make it professional, friendly, or efficient, and apply it consistently across all interactions.

For regular users this simply helps you be more comfortable with the answers it gives you. But for companies it is even more important, since you can align the tone with what you want to use both in your communications with customers and in internal documentation.

Context retention improvements

Context retention is more effective, which improves continuity in long interactions and with multiple shifts. This will help you as a user, but it is especially important in the business environment, in uses such as customer service or knowledge base systems.

Performance optimization

Response generation is now faster, and token overhead is reduced to make GPT-5.1 a better model for automated environments. It can deliver higher quality or better results using fewer tokens than previous models, reducing the overall costs of using the API.

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