Seems like hacking is the new benchmark for these AI companies.

Why didn't they used any Chinese open models?

Maybe they were not as good at the time, or the contractor just used to use ChatGPT. Also ChatGPT can be used without a phone number registration, unlike Chinese models.

How do you know they didn't?

How many user do the Chinese open models have and how many users do OpenAI have?

They very likely also do that

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