Jesus Rodriguez(@jrdothoughts):My essay at TheSequence today covers the topic of environments in AI post-training AI environments are becoming a core ingredient of model capability: executable worlds that generate trajectories and feedback, not just exams. This essay traces their path from Atari, OpenAI Gym, and AlphaZero through MuJoCo to the RLVR-driven post-training behind Tulu 3 and DeepSeek-R1, then surveys the new generation of agent environments, including SWE-Gym, WebArena, OSWorld, TheAgentCompany, Tau2-bench, and AgentMercury. Check it out:

Jesus Rodriguez

@jrdothoughts

Co-Founder, CTO-CPO of @SentoraHQ (fmr IntoTheBlock), Co-Founder of @layerlens_ai, @neuralfabric( acq by Cisco) and The Sequence, Teaching at Columbia-Wharton

Joined September 2011

1.6K Following 6.6K Followers

Jesus Rodriguez@jrdothoughts

2026.10.22 14:22

My essay at TheSequence today covers the topic of environments in AI post-training AI environments are becoming a core ingredient of model capability: executable worlds that generate trajectories and feedback, not just exams. This essay traces their path from Atari, OpenAI Gym, and AlphaZero through MuJoCo to the RLVR-driven post-training behind Tulu 3 and DeepSeek-R1, then surveys the new generation of agent environments, including SWE-Gym, WebArena, OSWorld, TheAgentCompany, Tau2-bench, and AgentMercury. Check it out: