Dev argues Persimmon is the most underrated Western lab release: realistic user simulators may be quietly powering RL environments
willcb · x · 2026-10-06
Developer willcb argues that the most exciting model release from a new Western lab in recent months (behind Jevons, of course) is Persimmon — because people are massively underrating the utility of great, realistic user simulators. He speculates that Persimmon is likely "quietly printing" money as a private API used in RL training environments, highlighting an underappreciated commercial path for user-simulator models.
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