PSF-Med - Frontier Hardest 500: leaderboard
Metric: Paraphrase Flip Rate (%). Source: huggingface.co. 6 models tracked.
Top models
| # | Model | Score |
|---|---|---|
| 1 | Kimi K3 (Low) | 5.71 |
| 2 | GPT-5 Mini (Low) | 5.93 |
| 3 | Claude Opus 5 (Non-reasoning) | 8.36 |
| 4 | Claude Opus 5 (Thinking) | 9.53 |
| 5 | GPT-5.6 Sol (Low) | 9.71 |
| 6 | Claude Haiku 4.5 | 11.13 |
Interactive version: theaggregate.ai/benchmark?slug=psf-med-frontier-hardest-500 · How It Works · Data refreshed daily, snapshot 2026-09-19.