Model comparison
Claude 3.5 Sonnet vs Claude Fable 5
Claude Fable 5 is the stronger model overall, scoring 66.8 to 34.6 on the Noometry Index.
Last verified . 27 shared benchmarks.
Summary
- They share 27 benchmarks with published results for both. Claude 3.5 Sonnet 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 88.5 to 19.2.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 8.5% for Claude 3.5 Sonnet and 100% for Claude Fable 5.
Side by side
| Claude 3.5 Sonnet | Claude Fable 5 | |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Noometry Index | 34.6 | 66.8 |
| Released | 2024-06-20 | 2026-06-07 |
| Weights | Proprietary | Proprietary |
| Context window | — | 1M |
| Max output | — | 128K |
| Input $ / M tokens | — | $10 |
| Output $ / M tokens | — | $50 |
| Results tracked | 60 | 62 |
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Category by category
Coding Claude Fable 5 leads
Claude 3.5 Sonnet: 39.0 (#165), Claude Fable 5: 70.6 (#4)
| Benchmark | Claude 3.5 Sonnet | Claude Fable 5 |
|---|---|---|
| GSO | 4.6% | 78.4% |
| WeirdML | 40% | 91.9% |
| LMArena Coding | 1342 | 1519 |
| DeepSWE | — | 69.9% |
| FrontierCode | — | 53.5% |
| Aider Polyglot | 51.6% | — |
| LMArena WebDev | — | 1625 |
| FrontierSWE | — | 47% |
| SciCode | — | 61% |
| BigCodeBench Instruct | 46.8% | — |
| LiveBench Coding | 67.1% | — |
| MirrorCode | — | 63.9% |
| BigCodeBench Complete | 58.6% | — |
| CadEval | 48% | — |
| ALE-Bench | — | 2,041 |
| HumanEval+ | 81.7% | — |
| MBPP+ | 74.3% | — |
Agentic & Tool Use Claude Fable 5 leads
Claude 3.5 Sonnet: 32.3 (#67), Claude Fable 5: 54.0 (#2)
| Benchmark | Claude 3.5 Sonnet | Claude Fable 5 |
|---|---|---|
| APEX-Agents | — | 63.6% |
| Remote Labor Index | — | 16.1% |
| TheAgentCompany | 24% | — |
| τ²-bench Banking | — | 39.7% |
| Cybench | 17.5% | — |
| PostTrainBench | — | 41.8% |
| BALROG | 32.6% | — |
| GBAEval | — | 74.5% |
| GDP.pdf | — | 30% |
| LMArena Search | — | 1230 |
| METR Time Horizons | 45.2% | — |
| Vending-Bench 2 | — | 5,680 |
Reasoning Claude Fable 5 leads
Claude 3.5 Sonnet: 23.1 (#183), Claude Fable 5: 76.8 (#6)
| Benchmark | Claude 3.5 Sonnet | Claude Fable 5 |
|---|---|---|
| SimpleBench | 41.4% | 81.9% |
| EnigmaEval | 0.9% | 39.3% |
| LMArena Hard Prompts | 1305 | 1508 |
| DTBench | 67.8% | 98.4% |
| Epoch Capabilities Index | 133.55 | 162.06 |
| ARC-AGI-2 | — | 89.2% |
| Kagi LLM Benchmark | — | 91.4% |
| NYT Connections (extended) | — | 92.7% |
| ARC-AGI-1 | — | 98.5% |
| CritPt | — | 28.6% |
| Chess Puzzles | — | 41% |
| EBR-Bench | — | 39.5% |
| LiveBench Reasoning | 56.7% | — |
| Mystery Game Puzzles | — | 52% |
| LiveBench Data Analysis | 55% | — |
| LMCA | — | 61.1% |
| Surface Evolver Bench | — | 95% |
| Bench to the Future 3 | — | 0.13 |
| ForecastBench | 60.7 | — |
| LiveBench | 59% | — |
Math Claude Fable 5 leads
Claude 3.5 Sonnet: 19.2 (#288), Claude Fable 5: 88.5 (#5)
| Benchmark | Claude 3.5 Sonnet | Claude Fable 5 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 8.5% | 100% |
| LMArena Math | 1307 | 1519 |
| FrontierMath (Tiers 1-3) | — | 87% |
| FrontierMath Tier 4 | — | 90.2% |
| ProofBench | — | 95% |
| Omni-MATH | 27.6% | — |
| LiveBench Math | 52.3% | — |
| MATH Level 5 | 56.9% | — |
| FrontierMath (Feb 2025 set) | 2.1% | — |
| FrontierMath Erdős | — | 0% |
| FrontierMath Tier 4 (v1) | 0% | — |
Knowledge Claude Fable 5 leads
Claude 3.5 Sonnet: 28.6 (#245), Claude Fable 5: 62.2 (#25)
| Benchmark | Claude 3.5 Sonnet | Claude Fable 5 |
|---|---|---|
| GPQA Diamond | 55.3% | 85.9% |
| LMArena Expert | 1265 | 1534 |
| Humanity's Last Exam | 4.1% | — |
| SimpleQA Verified | — | 70.7% |
| MMLU-Pro | 77.7% | — |
| Confabulations | 19.9% | — |
| GPQA (HELM) | 56.5% | — |
| MMLU | 87.3% | — |
Multimodal Claude Fable 5 leads
Claude 3.5 Sonnet: 26.5 (#120), Claude Fable 5: 45.3 (#17)
| Benchmark | Claude 3.5 Sonnet | Claude Fable 5 |
|---|---|---|
| LMArena Vision | 1125 | 1324 |
| Video-MME | 60% | — |
| GeoBench | 62% | — |
| VPCT | 33% | — |
| Blueprint-Bench 2 | — | 38.6% |
| Furniture Assembly | — | 35.8% |
| LMArena Document | — | 1496 |
Multilingual Claude Fable 5 leads
Claude 3.5 Sonnet: 43.2 (#185), Claude Fable 5: 57.3 (#9)
| Benchmark | Claude 3.5 Sonnet | Claude Fable 5 |
|---|---|---|
| LMArena Non-English | 1283 | 1481 |
| LMArena Chinese | 1272 | 1543 |
| LMArena French | 1305 | 1505 |
| LMArena German | 1297 | 1486 |
| LMArena Japanese | 1234 | 1506 |
| LMArena Korean | 1200 | 1488 |
| LMArena Russian | 1306 | 1504 |
| LMArena Spanish | 1290 | 1498 |
Instruction Following Claude Fable 5 leads
Claude 3.5 Sonnet: 68.8 (#182), Claude Fable 5: 78.6 (#8)
| Benchmark | Claude 3.5 Sonnet | Claude Fable 5 |
|---|---|---|
| LMArena Instruction Following | 1297 | 1502 |
| LiveBench Instruction Following | 69.3% | — |
| IFEval | 85.5% | — |
Long Context Claude Fable 5 leads
Claude 3.5 Sonnet: 39.9 (#167), Claude Fable 5: 46.3 (#23)
| Benchmark | Claude 3.5 Sonnet | Claude Fable 5 |
|---|---|---|
| LMArena Longer Query | 1311 | 1509 |
Writing & Preference Claude Fable 5 leads
Claude 3.5 Sonnet: 52.9 (#164), Claude Fable 5: 75.9 (#5)
| Benchmark | Claude 3.5 Sonnet | Claude Fable 5 |
|---|---|---|
| LMArena Text | 1298 | 1491 |
| LMArena Creative Writing | 1292 | 1494 |
| EQ-Bench Creative Writing | 1451 | 1943 |
| LMArena Multi-Turn | 1326 | 1504 |
| Short-Story Creative Writing | 80.3% | — |
| WildBench | 79.2% | — |
| EQ-Bench 4 | — | 1340 |
| LiveBench Language | 53.8% | — |
Frequently asked questions
Is Claude 3.5 Sonnet better than Claude Fable 5?
Claude Fable 5 is the stronger model overall, scoring 66.8 to 34.6 on the Noometry Index.
Is Claude 3.5 Sonnet or Claude Fable 5 better for coding?
Claude Fable 5 scores higher on coding benchmarks: 70.6 versus 39.0 in the Noometry coding category.
How many benchmarks do Claude 3.5 Sonnet and Claude Fable 5 share?
27 benchmarks have published results for both models. Claude 3.5 Sonnet has 60 scored results on Noometry and Claude Fable 5 has 62.