Model comparison
Claude Fable 5.1 vs Olmo 3.1 32b Instruct
Claude Fable 5.1 is the stronger model overall, scoring 69.0 to 39.4 on the Noometry Index.
Last verified . 16 shared benchmarks.
Allen Institute for AI (Ai2)Summary
- They share 16 benchmarks with published results for both. Claude Fable 5.1 scores higher in 8 categories and Olmo 3.1 32b Instruct in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Fable 5.1 leads 89.6 to 36.3.
- Olmo 3.1 32b Instruct has downloadable open weights; the other is API-only.
Side by side
| Claude Fable 5.1 | Olmo 3.1 32b Instruct | |
|---|---|---|
| Provider | Anthropic | Allen Institute for AI (Ai2) |
| Noometry Index | 69.0 | 39.4 |
| Released | 2026-09-01 | — |
| Weights | Proprietary | Open |
| Context window | 1M | — |
| Max output | 128K | — |
| Input $ / M tokens | $10 | — |
| Output $ / M tokens | $50 | — |
| Results tracked | 52 | 16 |
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Category by category
Coding Claude Fable 5.1 leads
Claude Fable 5.1: 74.7 (#1), Olmo 3.1 32b Instruct: 39.5 (#157)
| Benchmark | Claude Fable 5.1 | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Coding | 1528 | 1347 |
| 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 Not comparable
Claude Fable 5.1: 50.7 (#5), Olmo 3.1 32b Instruct: —
| Benchmark | Claude Fable 5.1 | Olmo 3.1 32b 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 (#7), Olmo 3.1 32b Instruct: 26.4 (#132)
| Benchmark | Claude Fable 5.1 | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Hard Prompts | 1526 | 1322 |
| 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), Olmo 3.1 32b Instruct: 36.3 (#167)
| Benchmark | Claude Fable 5.1 | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Math | 1525 | 1305 |
| 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), Olmo 3.1 32b Instruct: 36.1 (#175)
| Benchmark | Claude Fable 5.1 | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Expert | 1535 | 1308 |
| Humanity's Last Exam | 46.5% | — |
| SimpleQA Verified | 70.8% | — |
Multimodal Not comparable
Claude Fable 5.1: 53.9 (#4), Olmo 3.1 32b Instruct: —
| Benchmark | Claude Fable 5.1 | Olmo 3.1 32b Instruct |
|---|---|---|
| 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), Olmo 3.1 32b Instruct: 42.6 (#191)
| Benchmark | Claude Fable 5.1 | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Non-English | 1507 | 1275 |
| LMArena Chinese | 1586 | 1304 |
| LMArena French | 1525 | 1328 |
| LMArena German | 1500 | 1282 |
| LMArena Korean | 1534 | 1206 |
| LMArena Russian | 1521 | 1268 |
| LMArena Spanish | 1516 | 1336 |
| LMArena Japanese | 1543 | — |
Instruction Following Claude Fable 5.1 leads
Claude Fable 5.1: 79.2 (#6), Olmo 3.1 32b Instruct: 68.6 (#187)
| Benchmark | Claude Fable 5.1 | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Instruction Following | 1517 | 1299 |
Long Context Claude Fable 5.1 leads
Claude Fable 5.1: 46.7 (#20), Olmo 3.1 32b Instruct: 39.9 (#166)
| Benchmark | Claude Fable 5.1 | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Longer Query | 1522 | 1312 |
Writing & Preference Claude Fable 5.1 leads
Claude Fable 5.1: 79.2 (#2), Olmo 3.1 32b Instruct: 50.2 (#185)
| Benchmark | Claude Fable 5.1 | Olmo 3.1 32b Instruct |
|---|---|---|
| LMArena Text | 1510 | 1311 |
| LMArena Creative Writing | 1507 | 1264 |
| LMArena Multi-Turn | 1492 | 1309 |
| EQ-Bench Creative Writing | 2162 | — |
Frequently asked questions
Is Claude Fable 5.1 better than Olmo 3.1 32b Instruct?
Claude Fable 5.1 is the stronger model overall, scoring 69.0 to 39.4 on the Noometry Index.
Is Claude Fable 5.1 or Olmo 3.1 32b Instruct better for coding?
Claude Fable 5.1 scores higher on coding benchmarks: 74.7 versus 39.5 in the Noometry coding category.
How many benchmarks do Claude Fable 5.1 and Olmo 3.1 32b Instruct share?
16 benchmarks have published results for both models. Claude Fable 5.1 has 52 scored results on Noometry and Olmo 3.1 32b Instruct has 16.