# Claude Fable 5 vs Claude Fable 5.1

> Claude Fable 5.1 is the stronger model overall, scoring 69.0 to 66.8 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-fable-5-vs-claude-fable-5-1
- Last updated: 2026-10-10
- Shared benchmarks: 50

## Summary

- They share 50 benchmarks with published results for both. Claude Fable 5 scores higher in 2 categories and Claude Fable 5.1 in 8 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in multimodal, where Claude Fable 5.1 leads 53.9 to 45.3.
- The biggest single-benchmark swing is Furniture Assembly: 35.8% for Claude Fable 5 and 70% for Claude Fable 5.1.
- Both cost about the same: $10 input and $50 output per million tokens.

## Snapshot

| | Claude Fable 5 | Claude Fable 5.1 |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Noometry Index | 66.8 | 69.0 |
| Rank | 5 | 2 |
| Context | 1M | 1M |
| Input $/M | $10 | $10 |
| Output $/M | $50 | $50 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Fable 5: 70.6 (#4)
- Claude Fable 5.1: 74.7 (#1)

| Benchmark | Claude Fable 5 | Claude Fable 5.1 |
|---|---|---|
| FrontierCode | 53.5% | 50.9% |
| LMArena WebDev | 1625 | 1744 |
| FrontierSWE | 47% | 56.3% |
| SciCode | 61% | 63.1% |
| GSO | 78.4% | 88.2% |
| WeirdML | 91.9% | 92.9% |
| LMArena Coding | 1519 | 1528 |
| MirrorCode | 63.9% | 73.3% |
| ALE-Bench | 2,041 | 2,143 |
| DeepSWE | 69.9% | — |
| CursorBench | — | 51.8% |

## Agentic & Tool Use

- Claude Fable 5: 54.0 (#2)
- Claude Fable 5.1: 50.7 (#5)

| Benchmark | Claude Fable 5 | Claude Fable 5.1 |
|---|---|---|
| APEX-Agents | 63.6% | 68.6% |
| Remote Labor Index | 16.1% | 17.9% |
| GDP.pdf | 30% | 29.6% |
| Vending-Bench 2 | 5,680 | 5,422 |
| τ²-bench Banking | 39.7% | — |
| PostTrainBench | 41.8% | — |
| GBAEval | 74.5% | — |
| LMArena Search | 1230 | — |

## Reasoning

- Claude Fable 5: 76.8 (#6)
- Claude Fable 5.1: 76.7 (#7)

| Benchmark | Claude Fable 5 | Claude Fable 5.1 |
|---|---|---|
| ARC-AGI-2 | 89.2% | 90% |
| NYT Connections (extended) | 92.7% | 90% |
| ARC-AGI-1 | 98.5% | 97.5% |
| CritPt | 28.6% | 31.1% |
| Chess Puzzles | 41% | 47% |
| EBR-Bench | 39.5% | 57.1% |
| LMArena Hard Prompts | 1508 | 1526 |
| Mystery Game Puzzles | 52% | 58% |
| DTBench | 98.4% | 97.6% |
| LMCA | 61.1% | 65.5% |
| Epoch Capabilities Index | 162.06 | 164.7 |
| SimpleBench | 81.9% | — |
| Kagi LLM Benchmark | 91.4% | — |
| EnigmaEval | 39.3% | — |
| Surface Evolver Bench | 95% | — |
| Bench to the Future 3 | 0.13 | — |

## Math

- Claude Fable 5: 88.5 (#5)
- Claude Fable 5.1: 89.6 (#4)

| Benchmark | Claude Fable 5 | Claude Fable 5.1 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 87% | 90.2% |
| FrontierMath Tier 4 | 90.2% | 87.8% |
| OTIS Mock AIME 2024-2025 | 100% | 100% |
| ProofBench | 95% | 100% |
| LMArena Math | 1519 | 1525 |
| FrontierMath Erdős | 0% | 0% |

## Knowledge

- Claude Fable 5: 62.2 (#25)
- Claude Fable 5.1: 69.6 (#6)

| Benchmark | Claude Fable 5 | Claude Fable 5.1 |
|---|---|---|
| SimpleQA Verified | 70.7% | 70.8% |
| LMArena Expert | 1534 | 1535 |
| GPQA Diamond | 85.9% | — |
| Humanity's Last Exam | — | 46.5% |

## Multimodal

- Claude Fable 5: 45.3 (#17)
- Claude Fable 5.1: 53.9 (#4)

| Benchmark | Claude Fable 5 | Claude Fable 5.1 |
|---|---|---|
| LMArena Vision | 1324 | 1318 |
| Blueprint-Bench 2 | 38.6% | 41.9% |
| Furniture Assembly | 35.8% | 70% |
| LMArena Document | 1496 | 1513 |

## Multilingual

- Claude Fable 5: 57.3 (#9)
- Claude Fable 5.1: 59.1 (#3)

| Benchmark | Claude Fable 5 | Claude Fable 5.1 |
|---|---|---|
| LMArena Non-English | 1481 | 1507 |
| LMArena Chinese | 1543 | 1586 |
| LMArena French | 1505 | 1525 |
| LMArena German | 1486 | 1500 |
| LMArena Japanese | 1506 | 1543 |
| LMArena Korean | 1488 | 1534 |
| LMArena Russian | 1504 | 1521 |
| LMArena Spanish | 1498 | 1516 |

## Instruction Following

- Claude Fable 5: 78.6 (#8)
- Claude Fable 5.1: 79.2 (#6)

| Benchmark | Claude Fable 5 | Claude Fable 5.1 |
|---|---|---|
| LMArena Instruction Following | 1502 | 1517 |

## Long Context

- Claude Fable 5: 46.3 (#23)
- Claude Fable 5.1: 46.7 (#20)

| Benchmark | Claude Fable 5 | Claude Fable 5.1 |
|---|---|---|
| LMArena Longer Query | 1509 | 1522 |

## Writing & Preference

- Claude Fable 5: 75.9 (#5)
- Claude Fable 5.1: 79.2 (#2)

| Benchmark | Claude Fable 5 | Claude Fable 5.1 |
|---|---|---|
| LMArena Text | 1491 | 1510 |
| LMArena Creative Writing | 1494 | 1507 |
| EQ-Bench Creative Writing | 1943 | 2162 |
| LMArena Multi-Turn | 1504 | 1492 |
| EQ-Bench 4 | 1340 | — |

## FAQ

### Is Claude Fable 5 better than Claude Fable 5.1?

Claude Fable 5.1 is the stronger model overall, scoring 69.0 to 66.8 on the Noometry Index.

### Which is cheaper, Claude Fable 5 or Claude Fable 5.1?

Claude Fable 5.1 is cheaper. It lists at $10 per million input tokens and $50 per million output tokens; Claude Fable 5 lists at $10 and $50.

### Is Claude Fable 5 or Claude Fable 5.1 better for coding?

Claude Fable 5.1 scores higher on coding benchmarks: 74.7 versus 70.6 in the Noometry coding category.

### Which has the bigger context window?

Both accept 1M tokens.

### How many benchmarks do Claude Fable 5 and Claude Fable 5.1 share?

50 benchmarks have published results for both models. Claude Fable 5 has 62 scored results on Noometry and Claude Fable 5.1 has 52.