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Cursor bets on cheap open-weight post-training. The numbers make a strong case.

Cursor's Composer 2.5, shipped May 18, builds on an open-weight Kimi K2.5 checkpoint and matches Claude Opus 4.7 on every major coding benchmark at one-tenth the standard-tier price. The more interesting story is what they did with 85% of the compute budget after base training.

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