Model comparison
Claude Fable 5.1 vs Granite 3.1 2b Instruct
Claude Fable 5.1 is the stronger model overall, scoring 68.5 to 32.6 on the Noometry Index.
Last verified . 12 shared benchmarks.
Summary
- They share 12 benchmarks with published results for both. Claude Fable 5.1 scores higher in 8 categories and Granite 3.1 2b Instruct in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Fable 5.1 leads 89.5 to 30.6.
- Granite 3.1 2b Instruct has downloadable open weights; the other is API-only.
Side by side
| Claude Fable 5.1 | Granite 3.1 2b Instruct | |
|---|---|---|
| Provider | Anthropic | IBM |
| Noometry Index | 68.5 | 32.6 |
| Released | 2026-09-01 | — |
| Weights | Proprietary | Open |
| Context window | 1M | — |
| Max output | 128K | — |
| Input $ / M tokens | $10 | — |
| Output $ / M tokens | $50 | — |
| Results tracked | 50 | 12 |
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Category by category
Coding Claude Fable 5.1 leads
Claude Fable 5.1: 70.5 (#2), Granite 3.1 2b Instruct: 32.9 (#255)
| Benchmark | Claude Fable 5.1 | Granite 3.1 2b Instruct |
|---|---|---|
| LMArena Coding | 1523 | 1149 |
| FrontierCode | 50.9% | — |
| CursorBench | 51.8% | — |
| LMArena WebDev | 1753 | — |
| FrontierSWE | 56.3% | — |
| SciCode | 63.1% | — |
| WeirdML | 92.9% | — |
| MirrorCode | 73.3% | — |
| ALE-Bench | 2,143 | — |
Agentic & Tool Use Not comparable
Claude Fable 5.1: 50.8 (#5), Granite 3.1 2b Instruct: —
| Benchmark | Claude Fable 5.1 | Granite 3.1 2b Instruct |
|---|---|---|
| APEX-Agents | 68.6% | — |
| 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 (#5), Granite 3.1 2b Instruct: 21.0 (#206)
| Benchmark | Claude Fable 5.1 | Granite 3.1 2b Instruct |
|---|---|---|
| LMArena Hard Prompts | 1526 | 1138 |
| 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 | 165 | — |
Math Claude Fable 5.1 leads
Claude Fable 5.1: 89.5 (#3), Granite 3.1 2b Instruct: 30.6 (#206)
| Benchmark | Claude Fable 5.1 | Granite 3.1 2b Instruct |
|---|---|---|
| LMArena Math | 1519 | 1159 |
| 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: 69.3 (#5), Granite 3.1 2b Instruct: 30.3 (#223)
| Benchmark | Claude Fable 5.1 | Granite 3.1 2b Instruct |
|---|---|---|
| LMArena Expert | 1528 | 1131 |
| Humanity's Last Exam | 46.5% | — |
| SimpleQA Verified | 70.8% | — |
Multimodal Not comparable
Claude Fable 5.1: 54.1 (#4), Granite 3.1 2b Instruct: —
| Benchmark | Claude Fable 5.1 | Granite 3.1 2b Instruct |
|---|---|---|
| LMArena Vision | 1319 | — |
| Blueprint-Bench 2 | 41.9% | — |
| Furniture Assembly | 70% | — |
| LMArena Document | 1513 | — |
Multilingual Claude Fable 5.1 leads
Claude Fable 5.1: 59.5 (#2), Granite 3.1 2b Instruct: 29.2 (#264)
| Benchmark | Claude Fable 5.1 | Granite 3.1 2b Instruct |
|---|---|---|
| LMArena Non-English | 1509 | 1068 |
| LMArena Chinese | 1589 | 1138 |
| LMArena Russian | 1525 | 1063 |
| LMArena French | 1532 | — |
| LMArena German | 1495 | — |
| LMArena Japanese | 1565 | — |
| LMArena Spanish | 1503 | — |
Instruction Following Claude Fable 5.1 leads
Claude Fable 5.1: 79.3 (#6), Granite 3.1 2b Instruct: 58.0 (#259)
| Benchmark | Claude Fable 5.1 | Granite 3.1 2b Instruct |
|---|---|---|
| LMArena Instruction Following | 1515 | 1116 |
Long Context Claude Fable 5.1 leads
Claude Fable 5.1: 46.8 (#19), Granite 3.1 2b Instruct: 35.0 (#239)
| Benchmark | Claude Fable 5.1 | Granite 3.1 2b Instruct |
|---|---|---|
| LMArena Longer Query | 1524 | 1155 |
Writing & Preference Claude Fable 5.1 leads
Claude Fable 5.1: 79.3 (#1), Granite 3.1 2b Instruct: 34.3 (#269)
| Benchmark | Claude Fable 5.1 | Granite 3.1 2b Instruct |
|---|---|---|
| LMArena Text | 1511 | 1127 |
| LMArena Creative Writing | 1507 | 1116 |
| LMArena Multi-Turn | 1492 | 1099 |
| EQ-Bench Creative Writing | 2162 | — |
Frequently asked questions
Is Claude Fable 5.1 better than Granite 3.1 2b Instruct?
Claude Fable 5.1 is the stronger model overall, scoring 68.5 to 32.6 on the Noometry Index.
Is Claude Fable 5.1 or Granite 3.1 2b Instruct better for coding?
Claude Fable 5.1 scores higher on coding benchmarks: 70.5 versus 32.9 in the Noometry coding category.
How many benchmarks do Claude Fable 5.1 and Granite 3.1 2b Instruct share?
12 benchmarks have published results for both models. Claude Fable 5.1 has 50 scored results on Noometry and Granite 3.1 2b Instruct has 12.