Model comparison
Claude Fable 5.1 vs Nova 2.0 Pro Preview
Claude Fable 5.1 is the stronger model overall, scoring 69.0 to 33.4 on the Noometry Index.
Last verified . 3 shared benchmarks.
Summary
- They share 3 benchmarks with published results for both. Claude Fable 5.1 scores higher in 3 categories and Nova 2.0 Pro Preview in 0 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Claude Fable 5.1 leads 76.7 to 22.4.
- The biggest single-benchmark swing is CritPt: 31.1% for Claude Fable 5.1 and 0% for Nova 2.0 Pro Preview.
Side by side
| Claude Fable 5.1 | Nova 2.0 Pro Preview | |
|---|---|---|
| Provider | Anthropic | Amazon |
| Noometry Index | 69.0 | 33.4 |
| Released | 2026-09-01 | 2025-12-02 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | — |
| Max output | 128K | — |
| Input $ / M tokens | $10 | — |
| Output $ / M tokens | $50 | — |
| Results tracked | 52 | 3 |
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Category by category
Coding Claude Fable 5.1 leads
Claude Fable 5.1: 74.7 (#1), Nova 2.0 Pro Preview: 40.8 (#133)
| Benchmark | Claude Fable 5.1 | Nova 2.0 Pro Preview |
|---|---|---|
| SciCode | 63.1% | 42.7% |
| FrontierCode | 50.9% | — |
| CursorBench | 51.8% | — |
| LMArena WebDev | 1744 | — |
| FrontierSWE | 56.3% | — |
| GSO | 88.2% | — |
| WeirdML | 92.9% | — |
| LMArena Coding | 1528 | — |
| MirrorCode | 73.3% | — |
| ALE-Bench | 2,143 | — |
Agentic & Tool Use Claude Fable 5.1 leads
Claude Fable 5.1: 50.7 (#5), Nova 2.0 Pro Preview: 21.9 (#136)
| Benchmark | Claude Fable 5.1 | Nova 2.0 Pro Preview |
|---|---|---|
| GDP.pdf | 29.6% | 2% |
| APEX-Agents | 68.6% | — |
| Remote Labor Index | 17.9% | — |
| Vending-Bench 2 | 5,422 | — |
Reasoning Claude Fable 5.1 leads
Claude Fable 5.1: 76.7 (#7), Nova 2.0 Pro Preview: 22.4 (#194)
| Benchmark | Claude Fable 5.1 | Nova 2.0 Pro Preview |
|---|---|---|
| CritPt | 31.1% | 0% |
| ARC-AGI-2 | 90% | — |
| NYT Connections (extended) | 90% | — |
| ARC-AGI-1 | 97.5% | — |
| Chess Puzzles | 47% | — |
| EBR-Bench | 57.1% | — |
| LMArena Hard Prompts | 1526 | — |
| Mystery Game Puzzles | 58% | — |
| DTBench | 97.6% | — |
| LMCA | 65.5% | — |
| Epoch Capabilities Index | 164.7 | — |
Math Not comparable
Claude Fable 5.1: 89.6 (#4), Nova 2.0 Pro Preview: —
| Benchmark | Claude Fable 5.1 | Nova 2.0 Pro Preview |
|---|---|---|
| FrontierMath (Tiers 1-3) | 90.2% | — |
| FrontierMath Tier 4 | 87.8% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 100% | — |
| LMArena Math | 1525 | — |
| FrontierMath Erdős | 0% | — |
Knowledge Not comparable
Claude Fable 5.1: 69.6 (#6), Nova 2.0 Pro Preview: —
| Benchmark | Claude Fable 5.1 | Nova 2.0 Pro Preview |
|---|---|---|
| Humanity's Last Exam | 46.5% | — |
| SimpleQA Verified | 70.8% | — |
| LMArena Expert | 1535 | — |
Multimodal Not comparable
Claude Fable 5.1: 53.9 (#4), Nova 2.0 Pro Preview: —
| Benchmark | Claude Fable 5.1 | Nova 2.0 Pro Preview |
|---|---|---|
| LMArena Vision | 1318 | — |
| Blueprint-Bench 2 | 41.9% | — |
| Furniture Assembly | 70% | — |
| LMArena Document | 1513 | — |
Multilingual Not comparable
Claude Fable 5.1: 59.1 (#3), Nova 2.0 Pro Preview: —
| Benchmark | Claude Fable 5.1 | Nova 2.0 Pro Preview |
|---|---|---|
| LMArena Non-English | 1507 | — |
| LMArena Chinese | 1586 | — |
| LMArena French | 1525 | — |
| LMArena German | 1500 | — |
| LMArena Japanese | 1543 | — |
| LMArena Korean | 1534 | — |
| LMArena Russian | 1521 | — |
| LMArena Spanish | 1516 | — |
Instruction Following Not comparable
Claude Fable 5.1: 79.2 (#6), Nova 2.0 Pro Preview: —
| Benchmark | Claude Fable 5.1 | Nova 2.0 Pro Preview |
|---|---|---|
| LMArena Instruction Following | 1517 | — |
Long Context Not comparable
Claude Fable 5.1: 46.7 (#20), Nova 2.0 Pro Preview: —
| Benchmark | Claude Fable 5.1 | Nova 2.0 Pro Preview |
|---|---|---|
| LMArena Longer Query | 1522 | — |
Writing & Preference Not comparable
Claude Fable 5.1: 79.2 (#2), Nova 2.0 Pro Preview: —
| Benchmark | Claude Fable 5.1 | Nova 2.0 Pro Preview |
|---|---|---|
| LMArena Text | 1510 | — |
| LMArena Creative Writing | 1507 | — |
| EQ-Bench Creative Writing | 2162 | — |
| LMArena Multi-Turn | 1492 | — |
Frequently asked questions
Is Claude Fable 5.1 better than Nova 2.0 Pro Preview?
Claude Fable 5.1 is the stronger model overall, scoring 69.0 to 33.4 on the Noometry Index.
Is Claude Fable 5.1 or Nova 2.0 Pro Preview better for coding?
Claude Fable 5.1 scores higher on coding benchmarks: 74.7 versus 40.8 in the Noometry coding category.
How many benchmarks do Claude Fable 5.1 and Nova 2.0 Pro Preview share?
3 benchmarks have published results for both models. Claude Fable 5.1 has 52 scored results on Noometry and Nova 2.0 Pro Preview has 3.