TL;DR of the paper, generated automatically.

Rewriting a model's old reasoning into short notes makes its future reasoning shorter, no retraining needed.

• Method: rewrite earlier reasoning into compact state records, then compare continuations.
• Result: accepted compact histories usually shorten future reasoning across the tested models.
• Cost: in a coding-agent case, MiniMax M3 cost 34% less, counting rewrite time.
• Caveat: task quality and time depend on the target model and compressor.