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There’s a bubble forming in the artificial intelligence industry, according to OpenAI CEO Sam Altman.

“Are we in a phase where investors as a whole are overexcited about AI? My opinion is yes. Is AI the most important thing to happen in a very long time? My opinion is also yes,” Altman said.

“I’m sure someone’s gonna write some sensational headline about that. I wish you wouldn’t, but that’s fine,” he added. (Apologies to Altman.)