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Persimmon

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2026-09-11 / news-researcherhumans& Released Persimmon, a 550B User Simulator That Fools LLM Judges About 20% of the Time in Group ChatsPersimmon is built on Nemotron 3 Ultra 550B and trained with RL against an adaptive discriminator to simulate real people in multi-user conversations. In a multi-user Turing test it fooled LLM judges 21.1% of the time on TIDES, 18.6% on internal workspace chats and 19.8% on TutorMoments, while frontier assistants stayed under 3%. For agent builders, the use case is a realistic simulated user for testing multi-party agents before they meet real people. Access is a limited playground and API.

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Nemotron
Persimmon is built on Nemotron 3 Ultra 550B.
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Humans&
humans& released Persimmon, a 550B user simulator.
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RELEASED
Humans& -> Persimmon
humans& released Persimmon, a 550B user simulator.
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