Knowledge
Humanity's Last Exam Leaderboard
Humanity's Last Exam (HLE) is a set of extremely difficult, expert-written questions across many fields, designed so that even frontier models score low. It is built to stay hard as models improve, measuring the true knowledge frontier.
Source: epoch4 open models ranked+43 proprietaryData through Sep 2026
Open models ranked on Humanity's Last Exam
# shows rank among open models / rank overall (including proprietary).
| # | Model | Score |
|---|---|---|
| 1 / 14 | Kimi K2.5 · 1026.9B | 24.4% |
| 2 / 31 | GLM 4.5 · 358.3B | 8.3% |
| 3 / 32 | GLM 4.5 Air · 110.5B | 8.1% |
| 4 / 39 | Llama 4 Maverick 17B 128E Instruct · 401.6B | 5.7% |
Humanity's Last Exam: frequently asked questions
- What is the best open LLM on Humanity's Last Exam?
- Kimi K2.5 is the top open model on Humanity's Last Exam, scoring 24.4%. Among all models tested — including proprietary ones — it ranks #14. The top model overall is Claude Fable 5.1 (xhigh) (Anthropic) at 46.5%.
- Can open models match proprietary models on Humanity's Last Exam?
- Not quite on Humanity's Last Exam: the strongest proprietary model (Claude Fable 5.1 (xhigh)) scores 46.5%, ahead of the best open model (Kimi K2.5) at 24.4% — but you can run the open one yourself.
Scores aggregated from epoch. llmrun does not run this benchmark — see the source for methodology, or the about benchmarks for what it measures.