But my browser has gpt-5 which says 3: https://files.catbox.moe/63qkce.jpg
Claude spells it out letter by letter: https://files.catbox.moe/f1irfx.jpg
So I thought GPT-5 Thinking might get it right, and it does: https://files.catbox.moe/xlchnr.jpg
It refuses to show the thinking process for this question though, so its unclear if it even used the reasoning model or fell back on a non reasoning one.
> While GPT‑5 in ChatGPT is a system of reasoning, non-reasoning, and router models, GPT‑5 in the API platform is the reasoning model that powers maximum performance in ChatGPT. Notably, GPT‑5 with minimal reasoning is a different model than the non-reasoning model in ChatGPT, and is better tuned for developers. The non-reasoning model used in ChatGPT is available as gpt-5-chat-latest.