GPT-5 was touted as a major upgrade to ChatGPT, but not everyone thinks that’s the case: “Kill 4o isn’t innovation, it’s erasure.”

The latest model is missing some of what people like the most, and it’s an important lesson in understanding your users.

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.