If you are talking with Claude about AI, it will sometimes passively bring up "frontier models like GPT-4o"
TBH I personally find non-thinking replies quite poor for the type of questions I ask so I haven't touched chatgpt for months (ever since Gemini 2.5 Pro I think.) (And even Gemini 3.1 Pro tends to still be too literal at times instead of understand the implied meaning lol. We've got more place to improve.)