On measures of math mastery, the model scores a remarkable 100% accuracy on the AIME 2025 competition with Python tools.

With safer design, more robust reasoning, expanded developer tooling, and broad user access, GPT-5 reflects a maturing AI ecosystem.

At long last, GPT-5 has arrived — and it's free to all ChatGPT users.

Here’s a rundown of all of the changes you can expect to see in ChatGPT.