# Claude 3 Opus vs Claude Fable 5

> Claude Fable 5 is the stronger model overall, scoring 66.3 to 29.3 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-3-opus-vs-claude-fable-5
- Last updated: 2026-10-10
- Shared benchmarks: 28

## Summary

- They share 28 benchmarks with published results for both. Claude 3 Opus scores higher in 0 categories and Claude Fable 5 in 10 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Fable 5 leads 88.4 to 13.9.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 4.7% for Claude 3 Opus and 100% for Claude Fable 5.

## Snapshot

| | Claude 3 Opus | Claude Fable 5 |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Noometry Index | 29.3 | 66.3 |
| Rank | 300 | 5 |
| Context | — | 1M |
| Input $/M | — | $10 |
| Output $/M | — | $50 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude 3 Opus: 32.4 (#261)
- Claude Fable 5: 67.0 (#4)

| Benchmark | Claude 3 Opus | Claude Fable 5 |
|---|---|---|
| WeirdML | 19.2% | 91.9% |
| LMArena Coding | 1264 | 1519 |
| DeepSWE | — | 69.9% |
| FrontierCode | — | 53.5% |
| LMArena WebDev | — | 1626 |
| FrontierSWE | — | 47% |
| SciCode | — | 61% |
| BigCodeBench Instruct | 45.5% | — |
| LiveBench Coding | 38.6% | — |
| MirrorCode | — | 63.9% |
| BigCodeBench Complete | 57.4% | — |
| ALE-Bench | — | 2,041 |
| HumanEval+ | 77.4% | — |
| MBPP+ | 73.3% | — |

## Agentic & Tool Use

- Claude 3 Opus: 24.3 (#110)
- Claude Fable 5: 54.1 (#2)

| Benchmark | Claude 3 Opus | Claude Fable 5 |
|---|---|---|
| APEX-Agents | — | 63.6% |
| Remote Labor Index | — | 16.1% |
| τ²-bench Banking | — | 39.7% |
| Cybench | 10% | — |
| PostTrainBench | — | 41.8% |
| GBAEval | — | 74.5% |
| GDP.pdf | — | 30% |
| LMArena Search | — | 1230 |
| METR Time Horizons | 29.5% | — |
| Vending-Bench 2 | — | 5,680 |

## Reasoning

- Claude 3 Opus: 14.2 (#318)
- Claude Fable 5: 76.8 (#4)

| Benchmark | Claude 3 Opus | Claude Fable 5 |
|---|---|---|
| SimpleBench | 23.5% | 81.9% |
| Chess Puzzles | 5% | 41% |
| EnigmaEval | 0.8% | 39.3% |
| LMArena Hard Prompts | 1246 | 1508 |
| DTBench | 61.6% | 98.4% |
| LMCA | 17% | 61.1% |
| Epoch Capabilities Index | 126.91 | 163.6 |
| ARC-AGI-2 | — | 89.2% |
| Kagi LLM Benchmark | — | 91.4% |
| NYT Connections (extended) | — | 92.7% |
| ARC-AGI-1 | — | 98.5% |
| CritPt | — | 28.6% |
| EBR-Bench | — | 39.5% |
| LiveBench Reasoning | 40.6% | — |
| Mystery Game Puzzles | — | 52% |
| LiveBench Data Analysis | 57.9% | — |
| Surface Evolver Bench | — | 95% |
| Bench to the Future 3 | — | 0.13 |
| ForecastBench | 58.4 | — |
| LiveBench | 49.2% | — |
| WinoGrande | 88.5% | — |

## Math

- Claude 3 Opus: 13.9 (#293)
- Claude Fable 5: 88.4 (#5)

| Benchmark | Claude 3 Opus | Claude Fable 5 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 4.7% | 100% |
| LMArena Math | 1273 | 1519 |
| FrontierMath (Tiers 1-3) | — | 87% |
| FrontierMath Tier 4 | — | 90.2% |
| ProofBench | — | 95% |
| LiveBench Math | 43.6% | — |
| MATH Level 5 | 37.5% | — |
| FrontierMath Erdős | — | 0% |

## Knowledge

- Claude 3 Opus: 24.5 (#262)
- Claude Fable 5: 62.3 (#22)

| Benchmark | Claude 3 Opus | Claude Fable 5 |
|---|---|---|
| GPQA Diamond | 47.2% | 85.9% |
| SimpleQA Verified | 12.6% | 70.7% |
| LMArena Expert | 1223 | 1534 |
| Confabulations | 22.7% | — |
| MMLU | 84.6% | — |

## Multimodal

- Claude 3 Opus: 26.6 (#112)
- Claude Fable 5: 45.6 (#14)

| Benchmark | Claude 3 Opus | Claude Fable 5 |
|---|---|---|
| LMArena Vision | 1023 | 1326 |
| Blueprint-Bench 2 | — | 38.6% |
| Furniture Assembly | — | 35.8% |
| LMArena Document | — | 1496 |

## Multilingual

- Claude 3 Opus: 41.6 (#202)
- Claude Fable 5: 57.6 (#8)

| Benchmark | Claude 3 Opus | Claude Fable 5 |
|---|---|---|
| LMArena Non-English | 1258 | 1483 |
| LMArena Chinese | 1248 | 1546 |
| LMArena French | 1274 | 1509 |
| LMArena German | 1258 | 1486 |
| LMArena Japanese | 1204 | 1507 |
| LMArena Korean | 1187 | 1493 |
| LMArena Russian | 1280 | 1507 |
| LMArena Spanish | 1246 | 1503 |

## Instruction Following

- Claude 3 Opus: 64.3 (#223)
- Claude Fable 5: 78.8 (#7)

| Benchmark | Claude 3 Opus | Claude Fable 5 |
|---|---|---|
| LMArena Instruction Following | 1248 | 1503 |
| LiveBench Instruction Following | 63.9% | — |

## Long Context

- Claude 3 Opus: 38.2 (#197)
- Claude Fable 5: 46.3 (#22)

| Benchmark | Claude 3 Opus | Claude Fable 5 |
|---|---|---|
| LMArena Longer Query | 1259 | 1510 |

## Writing & Preference

- Claude 3 Opus: 47.4 (#208)
- Claude Fable 5: 76.1 (#5)

| Benchmark | Claude 3 Opus | Claude Fable 5 |
|---|---|---|
| LMArena Text | 1262 | 1491 |
| LMArena Creative Writing | 1235 | 1494 |
| LMArena Multi-Turn | 1275 | 1505 |
| EQ-Bench Creative Writing | — | 1943 |
| EQ-Bench 4 | — | 1340 |
| LiveBench Language | 50.4% | — |

## FAQ

### Is Claude 3 Opus better than Claude Fable 5?

Claude Fable 5 is the stronger model overall, scoring 66.3 to 29.3 on the Noometry Index.

### Is Claude 3 Opus or Claude Fable 5 better for coding?

Claude Fable 5 scores higher on coding benchmarks: 67.0 versus 32.4 in the Noometry coding category.

### How many benchmarks do Claude 3 Opus and Claude Fable 5 share?

28 benchmarks have published results for both models. Claude 3 Opus has 46 scored results on Noometry and Claude Fable 5 has 61.