AITomasz Tunguzabout 19 hours ago
Aftermarket Harnesses
3 min read
Endor Labs' Agent Security League found GPT-5.5 scored 61.5% functional correctness in Codex and 87.2% in Cursor, a 25.7-point swing from the runtime alone. Input tokens are 86-98% of OpenRouter volume, so the harness controls most costs through cache discipline.
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