Model comparison
Claude Fable 5.1 vs Nova 2 Lite
Claude Fable 5.1 is the stronger model overall, scoring 69.0 to 39.7 on the Noometry Index. Nova 2 Lite costs 24× less per token, which makes it the better buy when Claude Fable 5.1's lead doesn't matter for your workload.
Last verified . 17 shared benchmarks.
Summary
- They share 17 benchmarks with published results for both. Claude Fable 5.1 scores higher in 9 categories and Nova 2 Lite in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Fable 5.1 leads 89.6 to 37.5.
- Nova 2 Lite is cheaper at $0.30 / $2.50 per million input/output tokens, against $10 / $50 for Claude Fable 5.1.
Side by side
| Claude Fable 5.1 | Nova 2 Lite | |
|---|---|---|
| Provider | Anthropic | Amazon |
| Noometry Index | 69.0 | 39.7 |
| Released | 2026-09-01 | 2025-12-01 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 1M |
| Max output | 128K | 64K |
| Input $ / M tokens | $10 | $0.30 |
| Output $ / M tokens | $50 | $2.50 |
| Results tracked | 52 | 19 |
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Category by category
Coding Claude Fable 5.1 leads
Claude Fable 5.1: 74.7 (#1), Nova 2 Lite: 40.7 (#134)
| Benchmark | Claude Fable 5.1 | Nova 2 Lite |
|---|---|---|
| LMArena Coding | 1528 | 1385 |
| FrontierCode | 50.9% | — |
| CursorBench | 51.8% | — |
| LMArena WebDev | 1744 | — |
| FrontierSWE | 56.3% | — |
| SciCode | 63.1% | — |
| GSO | 88.2% | — |
| WeirdML | 92.9% | — |
| MirrorCode | 73.3% | — |
| ALE-Bench | 2,143 | — |
Agentic & Tool Use Claude Fable 5.1 leads
Claude Fable 5.1: 50.7 (#5), Nova 2 Lite: 24.1 (#121)
| Benchmark | Claude Fable 5.1 | Nova 2 Lite |
|---|---|---|
| APEX-Agents | 68.6% | — |
| Berkeley Function Calling Leaderboard | — | 27.1% |
| Remote Labor Index | 17.9% | — |
| GDP.pdf | 29.6% | — |
| Vending-Bench 2 | 5,422 | — |
Reasoning Claude Fable 5.1 leads
Claude Fable 5.1: 76.7 (#7), Nova 2 Lite: 27.5 (#118)
| Benchmark | Claude Fable 5.1 | Nova 2 Lite |
|---|---|---|
| LMArena Hard Prompts | 1526 | 1364 |
| ARC-AGI-2 | 90% | — |
| NYT Connections (extended) | 90% | — |
| ARC-AGI-1 | 97.5% | — |
| CritPt | 31.1% | — |
| Chess Puzzles | 47% | — |
| EBR-Bench | 57.1% | — |
| Mystery Game Puzzles | 58% | — |
| DTBench | 97.6% | — |
| LMCA | 65.5% | — |
| Epoch Capabilities Index | 164.7 | — |
Math Claude Fable 5.1 leads
Claude Fable 5.1: 89.6 (#4), Nova 2 Lite: 37.5 (#156)
| Benchmark | Claude Fable 5.1 | Nova 2 Lite |
|---|---|---|
| LMArena Math | 1525 | 1359 |
| FrontierMath (Tiers 1-3) | 90.2% | — |
| FrontierMath Tier 4 | 87.8% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 100% | — |
| FrontierMath Erdős | 0% | — |
Knowledge Claude Fable 5.1 leads
Claude Fable 5.1: 69.6 (#6), Nova 2 Lite: 43.0 (#94)
| Benchmark | Claude Fable 5.1 | Nova 2 Lite |
|---|---|---|
| LMArena Expert | 1535 | 1358 |
| Humanity's Last Exam | 46.5% | — |
| SimpleQA Verified | 70.8% | — |
| Vectara Hallucination Rate | — | 5.1% |
Multimodal Not comparable
Claude Fable 5.1: 53.9 (#4), Nova 2 Lite: —
| Benchmark | Claude Fable 5.1 | Nova 2 Lite |
|---|---|---|
| LMArena Vision | 1318 | — |
| Blueprint-Bench 2 | 41.9% | — |
| Furniture Assembly | 70% | — |
| LMArena Document | 1513 | — |
Multilingual Claude Fable 5.1 leads
Claude Fable 5.1: 59.1 (#3), Nova 2 Lite: 47.1 (#153)
| Benchmark | Claude Fable 5.1 | Nova 2 Lite |
|---|---|---|
| LMArena Non-English | 1507 | 1337 |
| LMArena Chinese | 1586 | 1364 |
| LMArena French | 1525 | 1381 |
| LMArena German | 1500 | 1343 |
| LMArena Japanese | 1543 | 1271 |
| LMArena Korean | 1534 | 1284 |
| LMArena Russian | 1521 | 1343 |
| LMArena Spanish | 1516 | 1373 |
Instruction Following Claude Fable 5.1 leads
Claude Fable 5.1: 79.2 (#6), Nova 2 Lite: 70.5 (#161)
| Benchmark | Claude Fable 5.1 | Nova 2 Lite |
|---|---|---|
| LMArena Instruction Following | 1517 | 1335 |
Long Context Claude Fable 5.1 leads
Claude Fable 5.1: 46.7 (#20), Nova 2 Lite: 40.6 (#150)
| Benchmark | Claude Fable 5.1 | Nova 2 Lite |
|---|---|---|
| LMArena Longer Query | 1522 | 1335 |
Writing & Preference Claude Fable 5.1 leads
Claude Fable 5.1: 79.2 (#2), Nova 2 Lite: 53.9 (#154)
| Benchmark | Claude Fable 5.1 | Nova 2 Lite |
|---|---|---|
| LMArena Text | 1510 | 1362 |
| LMArena Creative Writing | 1507 | 1291 |
| LMArena Multi-Turn | 1492 | 1338 |
| EQ-Bench Creative Writing | 2162 | — |
Frequently asked questions
Is Claude Fable 5.1 better than Nova 2 Lite?
Claude Fable 5.1 is the stronger model overall, scoring 69.0 to 39.7 on the Noometry Index. Nova 2 Lite costs 24× less per token, which makes it the better buy when Claude Fable 5.1's lead doesn't matter for your workload.
Which is cheaper, Claude Fable 5.1 or Nova 2 Lite?
Nova 2 Lite is cheaper. It lists at $0.30 per million input tokens and $2.50 per million output tokens; Claude Fable 5.1 lists at $10 and $50.
Is Claude Fable 5.1 or Nova 2 Lite better for coding?
Claude Fable 5.1 scores higher on coding benchmarks: 74.7 versus 40.7 in the Noometry coding category.
Which has the bigger context window?
Both accept 1M tokens.
How many benchmarks do Claude Fable 5.1 and Nova 2 Lite share?
17 benchmarks have published results for both models. Claude Fable 5.1 has 52 scored results on Noometry and Nova 2 Lite has 19.