HalluHard: leaderboard
Metric: Turn-1 Hallucination Rate. Source: halluhard.com. 32 models tracked.
Top models
| # | Model | Score |
|---|---|---|
| 1 | GPT-5.4 (Thinking) | 0.41 |
| 2 | GPT-5.5 (Medium) | 0.42 |
| 3 | Claude Fable 5 | 0.43 |
| 4 | GPT-5.3 | 0.52 |
| 5 | Gemini 3.1 Pro (Preview) | 0.54 |
| 6 | Claude Opus 4.7 | 0.55 |
| 7 | GPT-5.2 | 0.55 |
| 8 | Claude Sonnet 5 | 0.56 |
| 9 | Claude Opus 4.5 | 0.57 |
| 10 | Gemini 3 Pro | 0.58 |
| 11 | Claude Opus 4.6 | 0.59 |
| 12 | GPT-5 (Thinking) | 0.59 |
| 13 | Kimi K2.6 (Thinking) | 0.6 |
| 14 | Claude Sonnet 4.5 | 0.61 |
| 15 | Claude Sonnet 4.6 | 0.62 |
Interactive version: theaggregate.ai/benchmark?slug=halluhard · How It Works · Data refreshed daily, snapshot 2026-09-05.