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ARC leaderboard has results from semi-private data for frontier models, they have another competition for private data.

It is described in their methodology: https://arcprize.org/policy

It makes sense, since once OpenAI API receive task, it is not private anymore but leaked to OpenAI.

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Where are results for private data?

Which LLMs participate on private set? Open weight LLMs only?

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Yes, they run competitions once a year amongst open weight models
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