# Claude Fable 5.1 vs o1-mini

> Claude Fable 5.1 is the stronger model overall, scoring 68.5 to 33.7 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-fable-5-1-vs-o1-mini
- Last updated: 2026-10-10
- Shared benchmarks: 21

## Summary

- They share 21 benchmarks with published results for both. Claude Fable 5.1 scores higher in 9 categories and o1-mini in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Claude Fable 5.1 leads 76.7 to 8.9.
- The biggest single-benchmark swing is ARC-AGI-2: 90% for Claude Fable 5.1 and 0.8% for o1-mini.

## Snapshot

| | Claude Fable 5.1 | o1-mini |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 68.5 | 33.7 |
| Rank | 2 | 230 |
| Context | 1M | — |
| Input $/M | $10 | — |
| Output $/M | $50 | — |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Fable 5.1: 70.5 (#2)
- o1-mini: 35.1 (#218)

| Benchmark | Claude Fable 5.1 | o1-mini |
|---|---|---|
| WeirdML | 92.9% | 36.3% |
| LMArena Coding | 1523 | 1362 |
| FrontierCode | 50.9% | — |
| Aider Polyglot | — | 32.9% |
| CursorBench | 51.8% | — |
| LMArena WebDev | 1753 | — |
| FrontierSWE | 56.3% | — |
| SciCode | 63.1% | — |
| LiveBench Coding | — | 48% |
| MirrorCode | 73.3% | — |
| ALE-Bench | 2,143 | — |
| HumanEval+ | — | 89% |
| MBPP+ | — | 78.8% |

## Agentic & Tool Use

- Claude Fable 5.1: 50.8 (#5)
- o1-mini: 24.3 (#112)

| Benchmark | Claude Fable 5.1 | o1-mini |
|---|---|---|
| APEX-Agents | 68.6% | — |
| Remote Labor Index | 17.9% | — |
| Cybench | — | 10% |
| GDP.pdf | 29.6% | — |
| Vending-Bench 2 | 5,422 | — |

## Reasoning

- Claude Fable 5.1: 76.7 (#5)
- o1-mini: 8.9 (#340)

| Benchmark | Claude Fable 5.1 | o1-mini |
|---|---|---|
| ARC-AGI-2 | 90% | 0.8% |
| ARC-AGI-1 | 97.5% | 14% |
| LMArena Hard Prompts | 1526 | 1333 |
| Epoch Capabilities Index | 165 | 135.82 |
| SimpleBench | — | 18.1% |
| NYT Connections (extended) | 90% | — |
| CritPt | 31.1% | — |
| Chess Puzzles | 47% | — |
| EBR-Bench | 57.1% | — |
| LiveBench Reasoning | — | 72.3% |
| Mystery Game Puzzles | 58% | — |
| DTBench | 97.6% | — |
| LiveBench Data Analysis | — | 57.9% |
| LMCA | 65.5% | — |
| LiveBench | — | 57.8% |

## Math

- Claude Fable 5.1: 89.5 (#3)
- o1-mini: 33.7 (#168)

| Benchmark | Claude Fable 5.1 | o1-mini |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 100% | 46.9% |
| LMArena Math | 1519 | 1358 |
| FrontierMath (Tiers 1-3) | 90.2% | — |
| FrontierMath Tier 4 | 87.8% | — |
| ProofBench | 100% | — |
| LiveBench Math | — | 62% |
| MATH Level 5 | — | 89.2% |
| FrontierMath (Feb 2025 set) | — | 1.7% |
| FrontierMath Erdős | 0% | — |

## Knowledge

- Claude Fable 5.1: 69.3 (#5)
- o1-mini: 34.8 (#180)

| Benchmark | Claude Fable 5.1 | o1-mini |
|---|---|---|
| LMArena Expert | 1528 | 1316 |
| GPQA Diamond | — | 62.4% |
| Humanity's Last Exam | 46.5% | — |
| SimpleQA Verified | 70.8% | — |
| Confabulations | — | 18.6% |

## Multimodal

- Claude Fable 5.1: 54.1 (#4)
- o1-mini: —

| Benchmark | Claude Fable 5.1 | o1-mini |
|---|---|---|
| LMArena Vision | 1319 | — |
| Blueprint-Bench 2 | 41.9% | — |
| Furniture Assembly | 70% | — |
| LMArena Document | 1513 | — |

## Multilingual

- Claude Fable 5.1: 59.5 (#2)
- o1-mini: 43.8 (#177)

| Benchmark | Claude Fable 5.1 | o1-mini |
|---|---|---|
| LMArena Non-English | 1509 | 1289 |
| LMArena Chinese | 1589 | 1314 |
| LMArena French | 1532 | 1292 |
| LMArena German | 1495 | 1278 |
| LMArena Japanese | 1565 | 1245 |
| LMArena Russian | 1525 | 1283 |
| LMArena Spanish | 1503 | 1302 |
| LMArena Korean | — | 1223 |

## Instruction Following

- Claude Fable 5.1: 79.3 (#6)
- o1-mini: 67.0 (#200)

| Benchmark | Claude Fable 5.1 | o1-mini |
|---|---|---|
| LMArena Instruction Following | 1515 | 1304 |
| LiveBench Instruction Following | — | 65.4% |

## Long Context

- Claude Fable 5.1: 46.8 (#19)
- o1-mini: 40.1 (#156)

| Benchmark | Claude Fable 5.1 | o1-mini |
|---|---|---|
| LMArena Longer Query | 1524 | 1321 |

## Writing & Preference

- Claude Fable 5.1: 79.3 (#1)
- o1-mini: 48.6 (#196)

| Benchmark | Claude Fable 5.1 | o1-mini |
|---|---|---|
| LMArena Text | 1511 | 1317 |
| LMArena Creative Writing | 1507 | 1244 |
| LMArena Multi-Turn | 1492 | 1314 |
| Short-Story Creative Writing | — | 64.9% |
| EQ-Bench Creative Writing | 2162 | — |
| LiveBench Language | — | 40.9% |

## FAQ

### Is Claude Fable 5.1 better than o1-mini?

Claude Fable 5.1 is the stronger model overall, scoring 68.5 to 33.7 on the Noometry Index.

### Is Claude Fable 5.1 or o1-mini better for coding?

Claude Fable 5.1 scores higher on coding benchmarks: 70.5 versus 35.1 in the Noometry coding category.

### How many benchmarks do Claude Fable 5.1 and o1-mini share?

21 benchmarks have published results for both models. Claude Fable 5.1 has 50 scored results on Noometry and o1-mini has 39.