“GPT-5 is the first time that it really feels like talking to an expert in any topic, like a PhD-level expert.”

Sam Altman, August 2025

https://www.bbc.com/news/articles/cy5prvgw0r1o

What of it?

For me too, it was around that time last year, with GPT-5, Claude Sonnet 4.5 and then Gemini 3 that I started feeling that these models are clearly becoming great at reasoning. I'm not at all opposed to saying that they are around PhD-level on at least some domains.