GPT-5: Key characteristics, pricing and model card - https://news.ycombinator.com/item?id=44827794
Did you ask it to format the table a couple paragraphs above this claim after writing about hallucinations? Because I would classify the sorting mistake as one
What about the „9.9 / 9.11“ example?
It’s unclear to me where to draw the line between skill issue and hallucination. I image that one influences the other?
I know these companies do "shadow" updates continuously anyway so maybe it is meaningless but would be super interesting to know, nonetheless!
OpenAI and Anthropic don't update models without changing their IDs, at least for model IDs with a date in them.
OpenAI do provide some aliases, and their gpt-5-chat-latest and chatgpt-4o-latest model IDs can change without warning, but anything with a date in (like gpt-5-2025-08-07) stays stable.
Thank you to Simon; your notes are exactly what I was hoping for.
I called out the prompt injection section as "pretty weak sauce in my opinion".
I did actually have a negative piece of commentary in there about how you couldn't see the thinking traces in the API... but then I found out I had made a mistake about that and had to mostly remove that section! Here's the original (incorrect) text from that: https://gist.github.com/simonw/eedbee724cb2e66f0cddd2728686f... - and the corrected update: https://simonwillison.net/2025/Aug/7/gpt-5/#thinking-traces-...
The reason there's not much negative commentary in the post is that I genuinely think this model is really good. It's my favorite model right now. The moment that changes (I have high hopes for Claude 5 and Gemini 3) I'll write about it.
Suspicious.
It’s reasonable that he might be a little hyped about things because of his feelings about them and the methodology he uses to evaluate models. I assume good faith, as the HN guidelines propose, and this is the strongest plausible interpretation of what I see in his blog.
