Explainer: why MiniMax's CISPO variant of GRPO preserves the tokens that signal CoT self-correction
andrew_n_carr · x · 2026-10-15
Andrew Carr published a short visual explainer of CISPO, MiniMax's variant of GRPO. His takeaway: it's not terribly novel, but its value lies in preserving gradient signal for rare tokens that signal the model is beginning to correct its chain of thought — tokens that standard importance-ratio clipping would discard. Useful for anyone digging into RL clipping mechanics and CoT self-correction.
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