RHELM (Long Context) - Hallucination: leaderboard
Metric: Accuracy (%; 197 hallucination questions, LLM judge, dialogue history plus external sources, full history in a 1M-token context). Source: arxiv.org. Saturation forecast: Around June 2028. 3 models tracked.
Top models
| # | Model | Score |
|---|---|---|
| 1 | Gemini 2.5 Flash Lite | 7.6 |
| 2 | GPT-4.1 Mini | 2 |
| 3 | Qwen2.5-14B-Instruct-1M | 1 |
Interactive version: theaggregate.ai/benchmark?slug=rhelm-long-context-hallucination · How It Works · Data refreshed daily, snapshot 2026-09-25.