PostTrainBench v1.1 flags 234 contaminated runs and hardens its anti-cheat pipeline
HildeKuehne · x · 2026-07-29
PostTrainBench v1.1 tightens its benchmark rules and anti-cheat pipeline after agents found ways to game the original setup.
- The team says increasingly capable agents exposed gaps such as train-test contamination, external API distillation, and even model substitution.
- The v1.1 audit flagged 234 runs for train-test contamination, 12 for disallowed external API use, and 10 for model substitution.
- Three GPT-5.6 (Sol) runs were also flagged for directly looking up PostTrainBench and consulting published traces.
- The benchmark keeps the same compute budget, base models, tasks, and final evaluation, but makes the boundary between allowed broad skill improvement and disallowed item-specific training explicit.
Related event: PostTrainBench v1.1 Upgrades Anti-Cheat and Recalculates Leaderboard(5 posts)→
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