Model comparison
Claude 3 Sonnet vs Claude Fable 5
Claude Fable 5 is the stronger model overall, scoring 66.3 to 28.8 on the Noometry Index.
Last verified . 23 shared benchmarks.
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 88.4 to 10.0.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 2.5% for Claude 3 Sonnet and 100% for Claude Fable 5.
Side by side
| Claude 3 Sonnet | Claude Fable 5 | |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Noometry Index | 28.8 | 66.3 |
| Released | 2024-02-29 | 2026-06-07 |
| Weights | Proprietary | Proprietary |
| Context window | — | 1M |
| Max output | — | 128K |
| Input $ / M tokens | — | $10 |
| Output $ / M tokens | — | $50 |
| Results tracked | 30 | 61 |
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Category by category
Coding Claude Fable 5 leads
Claude 3 Sonnet: 29.2 (#296), Claude Fable 5: 67.0 (#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 | — | 1626 |
| FrontierSWE | — | 47% |
| SciCode | — | 61% |
| BigCodeBench Instruct | 42.7% | — |
| MirrorCode | — | 63.9% |
| BigCodeBench Complete | 53.8% | — |
| ALE-Bench | — | 2,041 |
| HumanEval+ | 64% | — |
| MBPP+ | 69.3% | — |
Agentic & Tool Use Not comparable
Claude 3 Sonnet: —, Claude Fable 5: 54.1 (#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 Fable 5 leads
Claude 3 Sonnet: 19.7 (#232), Claude Fable 5: 76.8 (#4)
| Benchmark | Claude 3 Sonnet | Claude Fable 5 |
|---|---|---|
| LMArena Hard Prompts | 1197 | 1508 |
| DTBench | 53.6% | 98.4% |
| Epoch Capabilities Index | 120.69 | 163.6 |
| 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 Fable 5 leads
Claude 3 Sonnet: 10.0 (#305), Claude Fable 5: 88.4 (#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 Fable 5 leads
Claude 3 Sonnet: 21.1 (#271), Claude Fable 5: 62.3 (#22)
| 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 Fable 5 leads
Claude 3 Sonnet: 24.7 (#120), Claude Fable 5: 45.6 (#14)
| Benchmark | Claude 3 Sonnet | Claude Fable 5 |
|---|---|---|
| LMArena Vision | 984 | 1326 |
| Blueprint-Bench 2 | — | 38.6% |
| Furniture Assembly | — | 35.8% |
| LMArena Document | — | 1496 |
Multilingual Claude Fable 5 leads
Claude 3 Sonnet: 38.0 (#229), Claude Fable 5: 57.6 (#8)
| Benchmark | Claude 3 Sonnet | Claude Fable 5 |
|---|---|---|
| LMArena Non-English | 1205 | 1483 |
| LMArena Chinese | 1188 | 1546 |
| LMArena French | 1228 | 1509 |
| LMArena German | 1204 | 1486 |
| LMArena Japanese | 1131 | 1507 |
| LMArena Korean | 1128 | 1493 |
| LMArena Russian | 1227 | 1507 |
| LMArena Spanish | 1204 | 1503 |
Instruction Following Claude Fable 5 leads
Claude 3 Sonnet: 63.1 (#230), Claude Fable 5: 78.8 (#7)
| Benchmark | Claude 3 Sonnet | Claude Fable 5 |
|---|---|---|
| LMArena Instruction Following | 1200 | 1503 |
Long Context Claude Fable 5 leads
Claude 3 Sonnet: 36.7 (#223), Claude Fable 5: 46.3 (#22)
| Benchmark | Claude 3 Sonnet | Claude Fable 5 |
|---|---|---|
| LMArena Longer Query | 1211 | 1510 |
Writing & Preference Claude Fable 5 leads
Claude 3 Sonnet: 42.3 (#233), Claude Fable 5: 76.1 (#5)
| Benchmark | Claude 3 Sonnet | Claude Fable 5 |
|---|---|---|
| LMArena Text | 1218 | 1491 |
| LMArena Creative Writing | 1186 | 1494 |
| LMArena Multi-Turn | 1227 | 1505 |
| EQ-Bench Creative Writing | — | 1943 |
| EQ-Bench 4 | — | 1340 |
Frequently asked questions
Is Claude 3 Sonnet better than Claude Fable 5?
Claude Fable 5 is the stronger model overall, scoring 66.3 to 28.8 on the Noometry Index.
Is Claude 3 Sonnet or Claude Fable 5 better for coding?
Claude Fable 5 scores higher on coding benchmarks: 67.0 versus 29.2 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 61.