When OpenAI launched GPT-5 earlier this month, it was meant to be a milestone moment, a demonstration of how far artificial intelligence had come in reasoning ability, adaptability, and real-world usefulness.

CEO Sam Altman wrote on X that OpenAI plans to update the model to “feel warmer than the current personality but not as annoying (to most users) as GPT-4o.” He added, “One learning for us from the past few days is we really just need to get to a world with more per-user customization of model personality.

OpenAI's GPT -5 has landed with a thud despite strong benchmark scores and praise from early testers. Why it matters: A lot rides on every launch of a major new large language model, since training these programs is a massive endeavor that can require months or years and billions of dollars.