# Claude 3 Sonnet vs Claude Fable 5

> Claude Fable 5 is the stronger model overall, scoring 66.8 to 29.0 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-3-sonnet-vs-claude-fable-5
- Last updated: 2026-10-12
- Shared benchmarks: 23

## Summary

- They share 23 benchmarks with published results for both. Claude 3 Sonnet scores higher in 0 categories and Claude Fable 5 in 9 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Fable 5 leads 88.5 to 10.7.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 2.5% for Claude 3 Sonnet and 100% for Claude Fable 5.

## Snapshot

| | Claude 3 Sonnet | Claude Fable 5 |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Noometry Index | 29.0 | 66.8 |
| Rank | 319 | 5 |
| Context | — | 1M |
| Input $/M | — | $10 |
| Output $/M | — | $50 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude 3 Sonnet: 29.6 (#302)
- Claude Fable 5: 70.6 (#4)

| Benchmark | Claude 3 Sonnet | Claude Fable 5 |
|---|---|---|
| WeirdML | 10.2% | 91.9% |
| LMArena Coding | 1223 | 1519 |
| DeepSWE | — | 69.9% |
| FrontierCode | — | 53.5% |
| LMArena WebDev | — | 1625 |
| FrontierSWE | — | 47% |
| SciCode | — | 61% |
| GSO | — | 78.4% |
| BigCodeBench Instruct | 42.7% | — |
| MirrorCode | — | 63.9% |
| BigCodeBench Complete | 53.8% | — |
| ALE-Bench | — | 2,041 |
| HumanEval+ | 64% | — |
| MBPP+ | 69.3% | — |

## Agentic & Tool Use

- Claude 3 Sonnet: —
- Claude Fable 5: 54.0 (#2)

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

## Reasoning

- Claude 3 Sonnet: 20.5 (#237)
- Claude Fable 5: 76.8 (#6)

| Benchmark | Claude 3 Sonnet | Claude Fable 5 |
|---|---|---|
| LMArena Hard Prompts | 1197 | 1508 |
| DTBench | 53.6% | 98.4% |
| Epoch Capabilities Index | 120.7 | 162.06 |
| ARC-AGI-2 | — | 89.2% |
| SimpleBench | — | 81.9% |
| Kagi LLM Benchmark | — | 91.4% |
| NYT Connections (extended) | — | 92.7% |
| ARC-AGI-1 | — | 98.5% |
| CritPt | — | 28.6% |
| Chess Puzzles | — | 41% |
| EnigmaEval | — | 39.3% |
| EBR-Bench | — | 39.5% |
| Mystery Game Puzzles | — | 52% |
| LMCA | — | 61.1% |
| Surface Evolver Bench | — | 95% |
| Bench to the Future 3 | — | 0.13 |
| WinoGrande | 75.1% | — |

## Math

- Claude 3 Sonnet: 10.7 (#310)
- Claude Fable 5: 88.5 (#5)

| Benchmark | Claude 3 Sonnet | Claude Fable 5 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 2.5% | 100% |
| LMArena Math | 1213 | 1519 |
| FrontierMath (Tiers 1-3) | — | 87% |
| FrontierMath Tier 4 | — | 90.2% |
| ProofBench | — | 95% |
| MATH Level 5 | 18.2% | — |
| FrontierMath Erdős | — | 0% |

## Knowledge

- Claude 3 Sonnet: 21.1 (#276)
- Claude Fable 5: 62.2 (#25)

| Benchmark | Claude 3 Sonnet | Claude Fable 5 |
|---|---|---|
| GPQA Diamond | 40.6% | 85.9% |
| LMArena Expert | 1173 | 1534 |
| SimpleQA Verified | — | 70.7% |
| MMLU | 75.9% | — |

## Multimodal

- Claude 3 Sonnet: 25.2 (#125)
- Claude Fable 5: 45.3 (#17)

| Benchmark | Claude 3 Sonnet | Claude Fable 5 |
|---|---|---|
| LMArena Vision | 984 | 1324 |
| Blueprint-Bench 2 | — | 38.6% |
| Furniture Assembly | — | 35.8% |
| LMArena Document | — | 1496 |

## Multilingual

- Claude 3 Sonnet: 37.8 (#234)
- Claude Fable 5: 57.3 (#9)

| Benchmark | Claude 3 Sonnet | Claude Fable 5 |
|---|---|---|
| LMArena Non-English | 1205 | 1481 |
| LMArena Chinese | 1189 | 1543 |
| LMArena French | 1229 | 1505 |
| LMArena German | 1204 | 1486 |
| LMArena Japanese | 1131 | 1506 |
| LMArena Korean | 1128 | 1488 |
| LMArena Russian | 1227 | 1504 |
| LMArena Spanish | 1204 | 1498 |

## Instruction Following

- Claude 3 Sonnet: 62.8 (#235)
- Claude Fable 5: 78.6 (#8)

| Benchmark | Claude 3 Sonnet | Claude Fable 5 |
|---|---|---|
| LMArena Instruction Following | 1199 | 1502 |

## Long Context

- Claude 3 Sonnet: 36.7 (#228)
- Claude Fable 5: 46.3 (#23)

| Benchmark | Claude 3 Sonnet | Claude Fable 5 |
|---|---|---|
| LMArena Longer Query | 1211 | 1509 |

## Writing & Preference

- Claude 3 Sonnet: 42.1 (#238)
- Claude Fable 5: 75.9 (#5)

| Benchmark | Claude 3 Sonnet | Claude Fable 5 |
|---|---|---|
| LMArena Text | 1218 | 1491 |
| LMArena Creative Writing | 1186 | 1494 |
| LMArena Multi-Turn | 1227 | 1504 |
| EQ-Bench Creative Writing | — | 1943 |
| EQ-Bench 4 | — | 1340 |

## FAQ

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

Claude Fable 5 is the stronger model overall, scoring 66.8 to 29.0 on the Noometry Index.

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

Claude Fable 5 scores higher on coding benchmarks: 70.6 versus 29.6 in the Noometry coding category.

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

23 benchmarks have published results for both models. Claude 3 Sonnet has 30 scored results on Noometry and Claude Fable 5 has 62.