Why RL environments work now (and couldn't in 2016): TRL + OpenEnv explained
SergioPaniego · x · 2026-09-07
The author previews Class 4 of the Training Agents series (Sept 10), which will show how coding agents train inside environments with a live TRL + OpenEnv walkthrough.
The post traces the lineage back to OpenAI's December 2016 Universe release — pitched as a platform for measuring and training general intelligence across the world's games, websites, and apps — and argues RL environments are experiencing a déjà vu moment: the ideas were right, but the ecosystem wasn't ready. Understanding where ideas came from helps locate where the field actually stands today.
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