HalluHard (All Domains Average)
Safety · 2026-02-01
Hallucination rate across legal, research, medical, and coding conversations.
Top models (lower is better)
| Model | Score |
|---|---|
| Opus 4.5 | 30.2 |
| GPT-5.4 | 31.9 |
| GPT-5.2 | 38.2 |
| Claude Fable 5 | 38.9 |
| GLM-5 | 39.7 |
| GPT-5.5 | 49.8 |
| Gemini 3.1 Pro Preview | 57.1 |
| Kimi K2.5 | 59.1 |
| Opus 4.7 | 59.6 |
| Sonnet 5 | 59.7 |
| Opus 4.6 | 60.9 |
| Gemini 3 Pro Preview | 61.9 |
| Kimi K2.6 | 63.6 |
| Sonnet 4.6 | 63.7 |
| GPT-5 | 64.8 |
| Sonnet 4.5 | 65.6 |
| Gemini 3 Flash Preview | 69.5 |
| GPT-5 Chat (2025-08-07) | 71.8 |
| GLM-5.2 | 74.8 |
| DeepSeek-V4-Pro | 74.9 |
| Grok 4 | 75.3 |
| DeepSeek-V3.2 | 75.8 |
| GPT-5 Mini | 75.9 |
| GLM-4.7 | 77.1 |
| Haiku 4.5 | 79.5 |
| Kimi K2 Thinking | 80.1 |
| Nemotron 3 Ultra 550B A55B | 84.5 |
| GPT-5 Nano | 85.1 |
| Grok 4.1 Fast | 86.0 |