ChatGPT 's long-awaited new engine is here, and GPT-5 promises faster speeds and more time spent thinking. But the new generative AI model has turned off some users with a tone shift away from its casual, conversational style.

GPT-5 has been in the works for months . It's a big step for OpenAI, more than two years after the release of GPT-4, with the company touting the model as a giant leap for large language models. "I tried going back to GPT-4 and it was quite miserable," said OpenAI CEO Sam Altman. "This is significantly better in obvious ways and subtle ways."

But the rollout has been a bit of a headache. Even Altman admitted on X that the rollout "was a little more bumpy than we hoped for!"

Like its predecessor, GPT-5 powers the chatbots, agents, and search tools in ChatGPT

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