If you ask it about the model name/cutoff date it claims to be "ChatGPT, based o... | Hacker News

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		rany_ on April 29, 2024 \| parent \| context \| favorite \| on: GPT-4.5 or GPT-5 being tested on LMSYS? If you ask it about the model name/cutoff date it claims to be "ChatGPT, based on GPT-4" and that the cutoff date is "Nov 2023." It claims that consistently so I think it might be accurate.

gs17 on April 29, 2024 [–]

That could be down to the system prompt, FastChat has a default prompt for GPT with that information in it.

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