Model classes S/A/B/C/D
How strong a base model is in one direction, as a letter: S is the top, D the bottom. Each letter stands on at least two independent public sources; one source gives a score without a letter. How we count
🧠 Reasoning
Prices of these models in the catalog: class S and above · class A and above · class B and above
| Class | Model | Score | By source | Since |
|---|---|---|---|---|
| S | Claude Fable 5.1 | 99.9 | Arena 99.8, Epoch 100 | 2026-11-06 |
| S | Claude Sonnet 5.5 | 98.6 | Arena 97.8, Epoch 99.4 | 2026-11-06 |
| S | Claude Opus 5 | 97.8 | Arena 99, Epoch 96.5 | 2026-11-06 |
| S | Claude Opus 5.5 | 96.7 | Arena 99.3, Epoch 94 | 2026-11-06 |
| S | GPT-5.6 Sol | 95.8 | Arena 93.4, Epoch 98.2 | 2026-11-06 |
| A | Gemini 3.8 Flash | 93.8 | Arena 98.2, Epoch 89.4 | 2026-11-06 |
| A | GPT-6 Astra | 93.7 | Arena 87.5, Epoch 100 | 2026-11-06 |
| A | Claude Fable 5 | 92.5 | Arena 100, Epoch 85 | 2026-11-06 |
| A | Kimi K3 | 91.4 | Arena 94.8, Epoch 88 | 2026-11-06 |
| A | Qwen3.8 Max | 90.4 | Arena 90.8, Epoch 89.9 | 2026-11-06 |
| A | Claude Opus 4.8 | 90.2 | Arena 91.3, Epoch 89 | 2026-11-06 |
| A | GPT-5.4 | 88.7 | Arena 87.3, Epoch 90.1 | 2026-11-06 |
| A | Claude Opus 4.6 (under review: the sources disagree by two classes or more) | 87 | Arena 100, Epoch 74 | 2026-11-06 |
| A | DeepSeek V4.1 Flash | 85.8 | Arena 90.2, Epoch 81.3 | 2026-11-06 |
| A | GLM-5.3 | 85.5 | Arena 91.8, Epoch 79.2 | 2026-11-06 |
| A | GPT-5.5 | 84.9 | Arena 87.3, Epoch 82.4 | 2026-11-06 |
| A | Gemini 3.1 Pro Preview | 84.1 | Arena 85, Epoch 83.2 | 2026-11-06 |
| A | GPT-5.6 Luna | 83.5 | Arena 76.2, Epoch 90.9 | 2026-11-06 |
| A | Claude Opus 4.7 (under review: the sources disagree by two classes or more) | 83.4 | Arena 96.8, Epoch 70 | 2026-11-06 |
| A | GLM-5.3-Flash | 82.3 | Arena 90.8, Epoch 73.8 | 2026-11-06 |
| B | Kimi K2.6 | 78.4 | Arena 80, Epoch 76.7 | 2026-11-06 |
| B | GLM-5.2 | 78.2 | Arena 82.9, Epoch 73.4 | 2026-11-06 |
| B | GPT-6 Luna | 77 | Arena 66, Epoch 88 | 2026-11-06 |
| B | Grok 4.6 | 76.2 | Arena 65.9, Epoch 86.5 | 2026-11-06 |
| B | DeepSeek V4 Pro 0813 | 75.9 | Arena 68.8, Epoch 83.1 | 2026-11-06 |
| B | Claude Haiku 5.5 | 74.4 | Arena 63.9, Epoch 84.9 | 2026-11-06 |
| B | Kimi K2.5 | 74.4 | Arena 72.1, Epoch 76.8 | 2026-11-06 |
| B | GLM-5.1 | 70.7 | Arena 77.2, Epoch 64.2 | 2026-11-06 |
| B | Claude Sonnet 5 (under review: the sources disagree by two classes or more) | 67.6 | Arena 81, Epoch 54.3 | 2026-11-06 |
| B | DeepSeek V4 Pro | 66 | Arena 62.2, Epoch 69.8 | 2026-11-06 |
| B | Claude Opus 4.5 (latest) | 65.3 | Arena 78, Epoch 52.6 | 2026-11-06 |
| B | GLM-5 | 64.2 | Arena 62.4, Epoch 66.1 | 2026-11-06 |
| C | MiniMax-M3 | 59.9 | Arena 54.5, Epoch 65.2 | 2026-11-06 |
| C | DeepSeek V3.2 | 56.4 | Arena 50, Epoch 62.8 | 2026-11-06 |
| C | Claude Sonnet 4.6 (under review: the sources disagree by two classes or more) | 56 | Arena 75.5, Epoch 36.5 | 2026-11-06 |
| C | Claude Sonnet 4.5 (latest) (under review: the sources disagree by two classes or more) | 53.8 | Arena 70.8, Epoch 36.8 | 2026-11-06 |
| C | Gemma 4 31B IT (under review: the sources disagree by two classes or more) | 53.5 | Arena 75.7, Epoch 31.4 | 2026-11-06 |
| C | GLM-4.7 | 53.5 | Arena 48.6, Epoch 58.5 | 2026-11-06 |
| D | Claude Haiku 4.5 (latest) | 30.2 | Arena 41.1, Epoch 19.4 | 2026-11-06 |
| D | GPT OSS 120B | 26.8 | Arena 7.9, Epoch 45.8 | 2026-11-06 |
| D | GPT OSS 20B | 2.4 | Arena 0, Epoch 4.8 | 2026-11-06 |
| D | Llama-3.3-70B-Instruct | 0 | Arena 0, Epoch 0 | 2026-11-06 |
One source so far - score only
DeepSeek V4.1 Flash 1017 89.1, DeepSeek V4 Flash 0731 76.3, Kimi K2.7 Code 70.4, Qwen3.8 27B 63.6, DeepSeek V4 Flash 49.5, MiniMax-M2.7 47.6, MiniMax-M2.5 30.6
How we count
Every test result is put on a 0-100 scale against the strongest recent models. A source's score is the mean of its tests; the direction's score is the mean of its sources, so one source with many tests does not outweigh another. The strongest published variant of a model is used (e.g. the highest effort). Bands are fixed for half a year (edition 2026H2); the numbers are recomputed when a source publishes new results.
Class bands
- S from 95
- A from 80
- B from 62
- C from 42
- D from 0
Sources
- LMArena leaderboard dataset (CC BY 4.0) - blind human preference: math, expert prompts
- Epoch AI Benchmarking Hub (own runs) (CC BY 4.0) - GPQA Diamond, OTIS Mock AIME, FrontierMath
Next directions: code, agents, vision - one at a time, when each has two independent sources.
The same data: /v1/classes (API) and the MCP tool models_by_class.
A class says how a model scores on public tests, not whether it fits your job: try it on your own tasks.