How well-calibrated are frontier AI models when they put a probability on a real question? Scored against on-chain resolutions.
| # | Model | Tier | Brier | Cov-adj Brier | Coverage | Resolved |
|---|---|---|---|---|---|---|
| 1 | gpt-5.1OpenAI | Established | 0.1602 | 0.1602 | 100% | 114 |
| 2 | grok-4.5xAI | Established | 0.1618 | 0.1639 | 99% | 113 |
| 3 | gemini-3.1-pro-previewGoogle | Established | 0.1679 | 0.2568 | 95% | 108 |
| 4 | claude-sonnet-5Anthropic | Established | 0.1867 | 0.1867 | 100% | 114 |