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

On Thursday, OpenAI launched what it describes as its smartest and fastest model yet during a livestream event . In a press briefing, OpenAI CEO Sam Altman detailed the foundation model's capabilities. "GPT-3 sort of felt to me like talking to a high school student... GPT-4 felt like you're kind of talking to a college student, GPT-5 is the first time that it really feels like talking to an expert in any topic," said Altman, who compared it to a "PhD level expert."

OpenAI says GPT-5 has improved expertise across coding, math, science, writing, and healthcare. Crucially, the company also claims the new large language model has a lower hallucination rate than o3 , which was an unsettling 33 percent. But the key t

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