Reasoning benchmark
LMArena Hard Prompts leaderboard
As of October 2026, Gemini 4 Argon has the highest published LMArena Hard Prompts score on Noometry at 1548, out of 297 models with results.
Last verified
About LMArena Hard Prompts
LMArena ratings restricted to prompts classified as hard.
- Category
- Reasoning
- Introduced
- 2024
- Format
- Pairwise human votes
- Unit
- Arena rating (Bradley–Terry)
- Official site
- lmarena.ai
Top 15 models
- Gemini 4 Argon 1548
- Claude Opus 5.5 1535
- Claude Opus 4.6 1527
- Claude Opus 5 1526
- Claude Fable 5.1 1526
- MiMo-V2.6-Pro 1512
- Gemini 3.8 Flash 1508
- Claude Fable 5 1508
- Claude Opus 4.7 1506
- Muse Spark 1.3 1503
- Qwen3.8 Max 1496
- Kimi K3 1496
- Claude Sonnet 5.5 1495
- Gemini 3.7 Flash 1494
- GLM-5.3-Flash 1491
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All results
Compare the leaders
Frequently asked questions
What does LMArena Hard Prompts measure?
LMArena ratings restricted to prompts classified as hard.
Which model has the highest LMArena Hard Prompts score?
As of October 2026, Gemini 4 Argon has the highest published LMArena Hard Prompts score on Noometry at 1548, out of 297 models with results.
What is the best open-weight model on LMArena Hard Prompts?
MiMo-V2.6-Pro has the highest LMArena Hard Prompts rating among open-weight models at 1512, ranking 6 of 297 overall.