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"Scaling Post-Training Is All We Did": RL Environments Are Now a Data-Supply Problem

This story is from 2026-09-29. It is preserved in the archive; the latest stories are on the live feed.

When Z.ai shipped GLM-5.3 this month, one line in the announcement got quoted everywhere: scaling post-training is all we did. No new base architecture, no bigger pretraining run. The gains came from reinforcement learning on a wider set of task environments. That sentence is a decent summary of Se…

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  1. 2026-09-29 02:07 · DEV Community — Machine Learning
    "Scaling Post-Training Is All We Did": RL Environments Are Now a Data-Supply Problem

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