Benchmark Almanac

Surface Evolver Bench

Claude Fable 5 95% leads since Jun 2026 Not in model cards

Agents write Surface Evolver datafiles that model liquid surfaces under physical constraints across 16 tasks. Deterministic checks give partial credit for matching hidden reference quantities.

Only one example task is public, and the scored tasks and grading scripts stay hidden.

Made by Yann Henon Released Jun 2026 Research science Public tasks plus a private test set Last model added Oct 2026 Scores refreshed 31 Oct 2026
Level
Expert Specialists with years of training, often over hours of work
Scored
Checked automatically A program checks the result against an answer key, unit tests or the expected final state.
Answers
Code A program or patch run against tests.
yhenon/surface-evolver-llm-eval 5 stars Leaderboard yhenon.github.io
26
Models scored in Epoch AI data

2 models share the top score of 95%

Best score per model in Epoch AI’s data. Where a model ran with several settings or harnesses, we keep its best.

26 models. Scroll sideways for the rest.

  1. 95.0 Claude Fable 5
  2. 95.0 Kimi K3
  3. 93.1 GPT-5.6 Sol
  4. 88.1 GPT-5.5
  5. 87.5 Claude Opus 4.8
  6. 83.8 GPT-5.6 Terra
  7. 76.9 Gemini 3.8 Flash
  8. 74.4 Grok 4.5
  9. 61.9 GPT-5.6 Luna
  10. 60.0 Claude Sonnet 5
  11. 58.1 Gemini 3.5 Flash
  12. 55.6 GLM-5.2
  13. 55.0 MiniMax-M3
  14. 52.5 Muse Spark 1.1
  15. 52.5 GLM-5.3-Flash
  16. 48.8 Kimi K2.7 Code
  17. 46.3 DeepSeek V4.1 Flash
  18. 45.0 Qwen 3.8 27B
  19. 44.4 Qwen 3.6 35B-A3B
  20. 40.0 DeepSeek-V4-Pro
  21. 30.6 Gemma 4 31B IT
  22. 28.1 Mistral Large 4
  23. 26.9 Mistral Medium 3.5
  24. 25.0 gpt-oss-120b
  25. 15.6 Trinity Large Thinking
  26. 15.6 Laguna M.1
  1. 1 Claude Fable 5 high 95%
  2. 2 Kimi K3 95%
  3. 3 GPT-5.6 Sol xhigh 93.1%
  4. 4 GPT-5.5 high 88.1%
  5. 5 Claude Opus 4.8 high 87.5%
  6. 6 GPT-5.6 Terra xhigh 83.8%
  7. 7 Gemini 3.8 Flash high 76.9%
  8. 8 Grok 4.5 high 74.4%
  9. 9 GPT-5.6 Luna medium 61.9%
  10. 10 Claude Sonnet 5 medium 60%
  11. 11 Gemini 3.5 Flash medium 58.1%
  12. 12 GLM-5.2 high 55.6%
  13. 13 MiniMax-M3 55%
  14. 14 Muse Spark 1.1 high 52.5%
  15. 15 GLM-5.3-Flash max 52.5%
  16. 16 Kimi K2.7 Code 48.8%
  17. 17 DeepSeek V4.1 Flash high 46.3%
  18. 18 Qwen 3.8 27B xhigh 45%
  19. 19 Qwen 3.6 35B-A3B 44.4%
  20. 20 DeepSeek-V4-Pro high 40%
  21. 21 Gemma 4 31B IT 30.6%
  22. 22 Mistral Large 4 28.1%
  23. 23 Mistral Medium 3.5 26.9%
  24. 24 gpt-oss-120b 25%
  25. 25 Trinity Large Thinking 15.6%
  26. 26 Laguna M.1 15.6%
#ModelScoreSettingDateSource
1 Claude Fable 5 95% high Jun 2026 Epoch AI
2 Kimi K3 95% Jul 2026 Epoch AI
3 GPT-5.6 Sol 93.1% xhigh Jul 2026 Epoch AI
4 GPT-5.5 88.1% high Apr 2026 Epoch AI
5 Claude Opus 4.8 87.5% high May 2026 Epoch AI
6 GPT-5.6 Terra 83.8% xhigh Jul 2026 Epoch AI
7 Gemini 3.8 Flash 76.9% high Sep 2026 Epoch AI
8 Grok 4.5 74.4% high Jul 2026 Epoch AI
9 GPT-5.6 Luna 61.9% medium Jul 2026 Epoch AI
10 Claude Sonnet 5 60% medium Jun 2026 Epoch AI
11 Gemini 3.5 Flash 58.1% medium May 2026 Epoch AI
12 GLM-5.2 55.6% high Jun 2026 Epoch AI
13 MiniMax-M3 55% Jun 2026 Epoch AI
14 Muse Spark 1.1 52.5% high Jul 2026 Epoch AI
15 GLM-5.3-Flash 52.5% max Aug 2026 Epoch AI
16 Kimi K2.7 Code 48.8% Jun 2026 Epoch AI
17 DeepSeek V4.1 Flash 46.3% high Sep 2026 Epoch AI
18 Qwen 3.8 27B 45% xhigh Aug 2026 Epoch AI
19 Qwen 3.6 35B-A3B 44.4% Apr 2026 Epoch AI
20 DeepSeek-V4-Pro 40% high Apr 2026 Epoch AI
21 Gemma 4 31B IT 30.6% Apr 2026 Epoch AI
22 Mistral Large 4 28.1% Oct 2026 Epoch AI
23 Mistral Medium 3.5 26.9% Apr 2026 Epoch AI
24 gpt-oss-120b 25% Aug 2025 Epoch AI
25 Trinity Large Thinking 15.6% Apr 2026 Epoch AI
26 Laguna M.1 15.6% Apr 2026 Epoch AI

2 models have held number one since its release in Jun 2026

Lab claims count from the day the card came out, independent runs from the model’s release.

OpenAI Anthropic
Epoch AI runs Passed 85% in Jun 2026, by GPT-5.5
Claude Fable 5 95%

The best score passed 85% in Apr 2026

All the scores we have, one dot each, so a model tested at several settings appears more than once.

Run or collected by Epoch AI Best so far
0% 20% 40% 60% 80% 100% 2026 Near the ceiling (85%) Claude Fable 5 GPT-5.5 Qwen 3.6 35B-A3B Gemma 4 31B IT gpt-oss-120b 0% 20% 40% 60% 80% 100% 2026 Near the ceiling (85%) Claude Fable 5 GPT-5.5

No lab model card reports it yet

We read the headline results of 479 launch posts from 51 labs, and none of them list this benchmark.

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