ChatGPT 5.1 vs ChatGPT 5: What’s Different In OpenAI’s Brand New Upgrade? Explained In 5 Points

ChatGPT 5.1 vs ChatGPT 5: OpenAI on Thursday launched its upgraded version of ChatGPT 5. Conversational style, more intelligent responses, advanced reasoning model, ability to understand and faster on simple tasks, are some of the key features of the upgraded version.

In line with OpenAI's effort to make the AI software more human, the company stated that GPT 5.1 has improved instruction following ability and is "now warmer by default and more conversational".

While OpenAI has made ambitious claims about the upgraded version, most ChatGPT users may not notice drastic changes, as the new release remains part of the broader ChatGPT 5 family. To better understand what's new and how it enhances your AI experience, here's a quick look at all the key updates and improvements in the latest version.

How ChatGPT 5.1 Is Different?

ChatGPT 5.1 comes in two variants: GPT-5.1 Instant and GPT 5.1 Thinking. GPT 5.1 Instant will offer "warmer, more intelligent, and better at following instructions." Whereas, GPT 5.1 Thinking offers "advanced reasoning model, now easier to understand and faster on simple tasks."

ChatGPT 5.1 vs ChatGPT 5

-The upgraded version will be more conversational and interactive. According to OpenAI, the upgraded version will use more interesting and playful language to provide responses.

-ChatGPT 5.1 comes with improved instruction following. Which means, that the new model comes with better ability to follow instructions. Hence, the model more reliably answers the question the person has asked for.

-ChatGPT 5.1 Instant is also enabled to use adaptive reasoning. The feature allows the AI model to "think before responding to more challenging questions". The recent upgrades ensures that users get more "thorough and accurate answers". As per OpenAI's website, the feature's utility is more visible on math and coding evaluations like AIME 2025 and Codeforces.

-ChatGPT-5 Thinking is also upgraded to make it more efficient and easier to understand in every day use. Understand it in such a way that someone has asked you about "What is the colour of apple?" and "Why is the apple of a specific colour?". While the first question may not require much thinking time, but the second may require a bit of thinking and analysis.

-The upgraded version of the AI model will provide responses with simpler languages, filled with less jargon and fewer undefined terms. The new ChatGPT 5.1's tone is also warmer and more empathetic.