Xiaomi MiMo may be first RL at 1M context, with agent-as-a-judge as new scaling axis
stochasticchasm · x · 2026-09-22
Commentary on Xiaomi MiMo's training ("classic mimo architecture, simple and strong") highlights two notable points:
- This may be the first model RL-trained at a 1M-token context (the author flags uncertainty)
- Heavy use of agent-as-a-judge at scale stands out — other Chinese labs are doing the same, effectively opening a new axis of compute scaling during RL that makes reward judging more robust.
A follow-up speculates that the "groupwise" setup may mean one agent per group, enabling contrastive grading, but this remains unconfirmed.
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