Benchmark Almanac

FrontierMath Tier 4 v2

GPT-6.1 Sol 100% leads since Sep 2026 In use

Models solve 43 unpublished research-level math problems and submit answers that code checks automatically. Scored by share correct.

Version 2 corrected 12 problems and removed 7 from the original Tier 4 set.

In the authors’ words

We introduce FrontierMath, a benchmark of hundreds of original, exceptionally challenging mathematics problems crafted and vetted by expert mathematicians. The questions cover most major branches of modern mathematics – from computationally intensive problems in number theory and real analysis to abstract questions in algebraic geometry and category theory. Solving a typical problem requires multiple hours of effort from a researcher in the relevant branch of mathematics, and for the upper end questions, multiple days. FrontierMath uses new, unpublished problems and automated verification to reliably evaluate models while minimizing risk of data contamination. Current state-of-the-art AI models solve under 2% of problems, revealing a vast gap between AI capabilities and the prowess of the mathematical community. As AI systems advance toward expert-level mathematical abilities, FrontierMath offers a rigorous testbed that quantifies their progress.

Abstract of FrontierMath: A Benchmark for Evaluating Advanced Mathematical Reasoning in AI (arXiv:2411.04872, CC0)
Made by Epoch AI Released Jun 2026 Research mathematics Public tasks plus a private test set Last in a launch post Jul 2026 Last model added Oct 2026 Scores refreshed 31 Oct 2026
Level
Research frontier Researchers, on open problems or tasks that take days
Scored
Checked automatically A program checks the result against an answer key, unit tests or the expected final state.
Answers
Short answer A number, word or short string matched to a key.
71
Models scored in Epoch AI data
2
Launch posts list it, from 1 lab

GPT-6.1 Sol leads with 100%

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

  1. 1 GPT-6.1 Sol max 100%
  2. 2 GPT-6 Astra high 97.6%
  3. 3 Claude Opus 5.5 max 95%
  4. 4 GPT-6.1 Terra max 92.7%
  5. 5 Claude Fable 5 max 90.2%
  6. 6 GPT-6 Sol max 90%
  7. 7 Claude Fable 5.1 max 87.8%
  8. 8 GPT-5.6 Sol max 82.9%
  9. 9 Claude Sonnet 5.5 max 80.5%
  10. 10 GPT-5.5 Pro xhigh 78%
  11. 11 Gemini 4 Argon high 78%
  12. 12 AI Co-Mathematician 75.6%
  13. 13 Claude Opus 5 max 73.2%
  14. 14 GPT-5.5 xhigh 72.5%
  15. 15 GPT-5.6 Terra max 70.7%
  16. 16 Muse Wonder max 70.7%
  17. 17 GPT-5.6 Luna max 61%
  18. 18 GPT-5.4 Pro xhigh 58.5%
  19. 19 Claude Opus 4.8 max 56.1%
  20. 20 GPT-6 Luna max 56.1%
  21. 21 GPT-5.4 xhigh 49%
  22. 22 Qwen 3.8 Max xhigh 46.3%
  23. 23 Muse Spark 1.3 max 46.3%
  24. 24 Claude Haiku 5.5 max 46.3%
  25. 25 DeepSeek V4.1 Flash 1017 max 46.3%
  26. 26 GPT-5.2 Pro xhigh 46%
  27. 27 Kimi K3 max 39%
  28. 28 Gemini 3.7 Flash high 36.6%
  29. 29 Qwen3.7-Max 34.1%
  30. 30 Qwen3.8 Max (0902) xhigh 34.1%
  31. 31 Claude Opus 4.7 max 31.7%
  32. 32 Grok 4.6 xhigh 31.7%
  33. 33 Muse Spark Open xhigh 31.7%
  34. 34 GPT-5.2 xhigh 31.7%
  35. 35 GLM-5.2 max 29.3%
  36. 36 Claude Sonnet 5 max 29.3%
  37. 37 GLM-5.3 max 29.3%
  38. 38 Claude Opus 4.6 max 26.8%
  39. 39 Gemini 3.1 Pro 26.8%
  40. 40 Gemini 3.5 Flash high 26.8%
  41. 41 DeepSeek V4 Pro 0813 max 26.8%
  42. 42 DeepSeek V4.1 Flash max 26.8%
  43. 43 Mistral Large 4 high 26.8%
  44. 44 Kimi K2.6 25.6%
  45. 45 Grok 4.5 high 24.4%
  46. 46 DeepSeek V4 Flash 0731 max 24.4%
  47. 47 GPT-5 high 21.9%
  48. 48 Gemini 3.6 Flash high 21.9%
  49. 49 Gemini 3.8 Flash high 21.9%
  50. 50 GPT-5 Pro high 19.5%
  51. 51 Gemini 3 Flash 17.1%
  52. 52 Grok 4.20 17.1%
  53. 53 Inkling-Small xhigh 17.1%
  54. 54 GLM-5.3-Flash max 17.1%
  55. 55 Grok 4.7 xhigh 17.1%
  56. 56 Grok 4.3 Beta high 14.6%
  57. 57 GPT-5 mini high 12.2%
  58. 58 GPT-5.4 Nano high 12.2%
  59. 59 Kimi K2.7 Code 12.2%
  60. 60 GPT-5.4 Mini xhigh 9.76%
  61. 61 o4-mini high 4.88%
  62. 62 Claude Opus 4.5 32k thinking 4.88%
  63. 63 Inkling xhigh 4.88%
  64. 64 Claude Opus 4.1 32K 2.44%
  65. 65 GPT-5 nano high 2.44%
  66. 66 Claude Sonnet 4.5 32k thinking 2.44%
  67. 67 DeepSeek-V4-Pro max 2.44%
  68. 68 GPT-5.5 Instant 2.44%
  69. 69 o3-mini high 0%
  70. 70 Gemini 2.5 Pro Jun 2025 0%
  71. 71 Gemini 3.5 Flash-Lite high 0%
#ModelScoreSettingDateSource
1 GPT-6.1 Sol 100% max Sep 2026 Epoch AI
2 GPT-6 Astra 97.6% high Sep 2026 Epoch AI
3 Claude Opus 5.5 95% max Sep 2026 Epoch AI
4 GPT-6.1 Terra 92.7% max Oct 2026 Epoch AI
5 Claude Fable 5 90.2% max Jun 2026 Epoch AI
6 GPT-6 Sol 90% max Sep 2026 Epoch AI
7 Claude Fable 5.1 87.8% max Sep 2026 Epoch AI
8 GPT-5.6 Sol 82.9% max Jul 2026 Epoch AI
9 Claude Sonnet 5.5 80.5% max Sep 2026 Epoch AI
10 GPT-5.5 Pro 78% xhigh Apr 2026 Epoch AI
11 Gemini 4 Argon 78% high Sep 2026 Epoch AI
12 AI Co-Mathematician 75.6% May 2026 Epoch AI
13 Claude Opus 5 73.2% max Jul 2026 Epoch AI
14 GPT-5.5 72.5% xhigh Apr 2026 Epoch AI
15 GPT-5.6 Terra 70.7% max Jul 2026 Epoch AI
16 Muse Wonder 70.7% max Oct 2026 Epoch AI
17 GPT-5.6 Luna 61% max Jul 2026 Epoch AI
18 GPT-5.4 Pro 58.5% xhigh Mar 2026 Epoch AI
19 Claude Opus 4.8 56.1% max May 2026 Epoch AI
20 GPT-6 Luna 56.1% max Sep 2026 Epoch AI
21 GPT-5.4 49% xhigh Mar 2026 Epoch AI
22 Qwen 3.8 Max 46.3% xhigh Aug 2026 Epoch AI
23 Muse Spark 1.3 46.3% max Sep 2026 Epoch AI
24 Claude Haiku 5.5 46.3% max Oct 2026 Epoch AI
25 DeepSeek V4.1 Flash 1017 46.3% max Oct 2026 Epoch AI
26 GPT-5.2 Pro 46% xhigh Dec 2025 Epoch AI
27 Kimi K3 39% max Jul 2026 Epoch AI
28 Gemini 3.7 Flash 36.6% high Aug 2026 Epoch AI
29 Qwen3.7-Max 34.1% May 2026 Epoch AI
30 Qwen3.8 Max (0902) 34.1% xhigh Sep 2026 Epoch AI
31 Claude Opus 4.7 31.7% max Apr 2026 Epoch AI
32 Grok 4.6 31.7% xhigh Aug 2026 Epoch AI
33 Muse Spark Open 31.7% xhigh Oct 2026 Epoch AI
34 GPT-5.2 31.7% xhigh Dec 2025 Epoch AI
35 GLM-5.2 29.3% max Jun 2026 Epoch AI
36 Claude Sonnet 5 29.3% max Jun 2026 Epoch AI
37 GLM-5.3 29.3% max Aug 2026 Epoch AI
38 Claude Opus 4.6 26.8% max Feb 2026 Epoch AI
39 Gemini 3.1 Pro 26.8% Feb 2026 Epoch AI
40 Gemini 3.5 Flash 26.8% high May 2026 Epoch AI
41 DeepSeek V4 Pro 0813 26.8% max Aug 2026 Epoch AI
42 DeepSeek V4.1 Flash 26.8% max Sep 2026 Epoch AI
43 Mistral Large 4 26.8% high Oct 2026 Epoch AI
44 Kimi K2.6 25.6% Apr 2026 Epoch AI
45 Grok 4.5 24.4% high Jul 2026 Epoch AI
46 DeepSeek V4 Flash 0731 24.4% max Jul 2026 Epoch AI
47 GPT-5 21.9% high Aug 2025 Epoch AI
48 Gemini 3.6 Flash 21.9% high Jul 2026 Epoch AI
49 Gemini 3.8 Flash 21.9% high Sep 2026 Epoch AI
50 GPT-5 Pro 19.5% high Oct 2025 Epoch AI
51 Gemini 3 Flash 17.1% Dec 2025 Epoch AI
52 Grok 4.20 17.1% Feb 2026 Epoch AI
53 Inkling-Small 17.1% xhigh Jul 2026 Epoch AI
54 GLM-5.3-Flash 17.1% max Aug 2026 Epoch AI
55 Grok 4.7 17.1% xhigh Sep 2026 Epoch AI
56 Grok 4.3 Beta 14.6% high Apr 2026 Epoch AI
57 GPT-5 mini 12.2% high Aug 2025 Epoch AI
58 GPT-5.4 Nano 12.2% high Mar 2026 Epoch AI
59 Kimi K2.7 Code 12.2% Jun 2026 Epoch AI
60 GPT-5.4 Mini 9.76% xhigh Mar 2026 Epoch AI
61 o4-mini 4.88% high Apr 2025 Epoch AI
62 Claude Opus 4.5 4.88% 32k thinking Nov 2025 Epoch AI
63 Inkling 4.88% xhigh Jul 2026 Epoch AI
64 Claude Opus 4.1 2.44% 32K Aug 2025 Epoch AI
65 GPT-5 nano 2.44% high Aug 2025 Epoch AI
66 Claude Sonnet 4.5 2.44% 32k thinking Sep 2025 Epoch AI
67 DeepSeek-V4-Pro 2.44% max Apr 2026 Epoch AI
68 GPT-5.5 Instant 2.44% May 2026 Epoch AI
69 o3-mini 0% high Jan 2025 Epoch AI
70 Gemini 2.5 Pro Jun 2025 0% Jun 2025 Epoch AI
71 Gemini 3.5 Flash-Lite 0% high Jul 2026 Epoch AI

Labs report scores for 2 models in their cards. We plot every source in the charts below.

4 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 Claude Fable 5

The best score passed 85% in Jun 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 Reported by the lab in its model card Best so far
0% 20% 40% 60% 80% 100% 2025 2026 2027 Near the ceiling (85%) GPT-6.1 Sol Claude Fable 5 GPT-5.5 Pro GPT-5.4 Pro GPT-5.2 Pro GPT-5 o4-mini 0% 20% 40% 60% 80% 100% 2025 2026 2027 Near the ceiling (85%) GPT-6.1 Sol Claude Fable 5

One lab put it in a launch post in the last six months

Launch posts from every lab that has listed it, one tick per post. Tall colored ticks include it, and short gray ones leave it out.

OpenAI
DateLaunch postScoreAs the post writes it
9 Jul 2026 GPT-5.6 Luna 58.5 FrontierMath Tier 4 (v2)
9 Jul 2026 GPT-5.6 Terra 68.3 FrontierMath Tier 4 (v2)

Versions

We switch the top row to each new version when it comes out. Open it for one row per version. An old version stays in play while people still test it, so whoever first takes it past 85% gets credit for closing it out.

OpenAI Google DeepMind Anthropic
FrontierMath Tier 4 v2 Passed 85% in Jun 2026, by Claude Fable 5
FrontierMath Tier 4 Passed 85% in Sep 2026, by GPT-6 Astra
GPT-6 Astra 97.6%
FrontierMath Tier 4 v2 Passed 85% in Jun 2026, by Claude Fable 5

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  • HMMT 2026 In use Models solve the 33 final-answer problems from the February 2026 Harvard-MIT Mathematics Tournament. Scored by exact answer match. GPT-5.5 98.5%
  • MathArena (Apex, IMO, USAMO) In use Evaluates models on newly released math competitions after release. Final-answer or human/LLM-judged proof scores. Claude Opus 4.8 81.3%
  • PolyMath In use Models solve 9,000 parallel math problems in 18 languages across four difficulty levels, from school math to frontier math. Final answers are checked. Qwen3.7-Max 86.5%
  • USAMO 2026 In use Models write full proofs for the six problems of the 2026 USA Mathematical Olympiad. Judges grade each proof from 0 to 7 against rubrics. GPT-5.5 98.2%