SAN FRANCISCO — ChatGPT is getting another upgrade.

On Thursday, OpenAI unveiled a new flagship AI model, GPT-5, and began sharing the technology with the hundreds of millions of people who use ChatGPT, the company’s online chatbot.

During a briefing with journalists, OpenAI executives called GPT-5 a “major upgrade” over the systems that previously powered ChatGPT, saying the new technology was faster, more accurate and less likely to “hallucinate,” or make stuff up.

“It feels significantly better in obvious ways and in subtle ways,” OpenAI’s chief executive, Sam Altman, said. “GPT-5 is the first time that it feels like talking to an expert in any topic — a Ph.D.-level expert.”

Since launching the artificial intelligence boom in late 2022 with the release of ChatGPT, OpenAI has consist

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