Model comparison
AI Co-Mathematician vs Claude Fable 5.1
Claude Fable 5.1 has enough public results to be ranked (#2); AI Co-Mathematician does not yet, so treat this comparison as directional.
Last verified . 1 shared benchmarks.
GoogleSummary
- They share 1 benchmark with published results for both. AI Co-Mathematician scores higher in 0 categories and Claude Fable 5.1 in 1 category; one gap is clear of the uncertainty.
- The widest gap is in math, where Claude Fable 5.1 leads 89.5 to 71.7.
- The biggest single-benchmark swing is FrontierMath Tier 4: 75.6% for AI Co-Mathematician and 87.8% for Claude Fable 5.1.
Side by side
| AI Co-Mathematician | Claude Fable 5.1 | |
|---|---|---|
| Provider | Anthropic | |
| Noometry Index | 57.6 | 68.5 |
| Released | 2026-05-08 | 2026-09-01 |
| Weights | Proprietary | Proprietary |
| Context window | — | 1M |
| Max output | — | 128K |
| Input $ / M tokens | — | $10 |
| Output $ / M tokens | — | $50 |
| Results tracked | 2 | 50 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Not comparable
AI Co-Mathematician: —, Claude Fable 5.1: 70.5 (#2)
| Benchmark | AI Co-Mathematician | Claude Fable 5.1 |
|---|---|---|
| FrontierCode | — | 50.9% |
| CursorBench | — | 51.8% |
| LMArena WebDev | — | 1753 |
| FrontierSWE | — | 56.3% |
| SciCode | — | 63.1% |
| WeirdML | — | 92.9% |
| LMArena Coding | — | 1523 |
| MirrorCode | — | 73.3% |
| ALE-Bench | — | 2,143 |
Agentic & Tool Use Not comparable
AI Co-Mathematician: —, Claude Fable 5.1: 50.8 (#5)
| Benchmark | AI Co-Mathematician | Claude Fable 5.1 |
|---|---|---|
| APEX-Agents | — | 68.6% |
| Remote Labor Index | — | 17.9% |
| GDP.pdf | — | 29.6% |
| Vending-Bench 2 | — | 5,422 |
Reasoning Not comparable
AI Co-Mathematician: —, Claude Fable 5.1: 76.7 (#5)
| Benchmark | AI Co-Mathematician | Claude Fable 5.1 |
|---|---|---|
| ARC-AGI-2 | — | 90% |
| NYT Connections (extended) | — | 90% |
| ARC-AGI-1 | — | 97.5% |
| CritPt | — | 31.1% |
| Chess Puzzles | — | 47% |
| EBR-Bench | — | 57.1% |
| LMArena Hard Prompts | — | 1526 |
| Mystery Game Puzzles | — | 58% |
| DTBench | — | 97.6% |
| LMCA | — | 65.5% |
| Epoch Capabilities Index | — | 165 |
Math Claude Fable 5.1 leads
AI Co-Mathematician: 71.7, Claude Fable 5.1: 89.5 (#3)
| Benchmark | AI Co-Mathematician | Claude Fable 5.1 |
|---|---|---|
| FrontierMath Tier 4 | 75.6% | 87.8% |
| FrontierMath (Tiers 1-3) | — | 90.2% |
| OTIS Mock AIME 2024-2025 | — | 100% |
| ProofBench | — | 100% |
| LMArena Math | — | 1519 |
| FrontierMath Erdős | — | 0% |
| FrontierMath Tier 4 (v1) | 47.9% | — |
Knowledge Not comparable
AI Co-Mathematician: —, Claude Fable 5.1: 69.3 (#5)
| Benchmark | AI Co-Mathematician | Claude Fable 5.1 |
|---|---|---|
| Humanity's Last Exam | — | 46.5% |
| SimpleQA Verified | — | 70.8% |
| LMArena Expert | — | 1528 |
Multimodal Not comparable
AI Co-Mathematician: —, Claude Fable 5.1: 54.1 (#4)
| Benchmark | AI Co-Mathematician | Claude Fable 5.1 |
|---|---|---|
| LMArena Vision | — | 1319 |
| Blueprint-Bench 2 | — | 41.9% |
| Furniture Assembly | — | 70% |
| LMArena Document | — | 1513 |
Multilingual Not comparable
AI Co-Mathematician: —, Claude Fable 5.1: 59.5 (#2)
| Benchmark | AI Co-Mathematician | Claude Fable 5.1 |
|---|---|---|
| LMArena Non-English | — | 1509 |
| LMArena Chinese | — | 1589 |
| LMArena French | — | 1532 |
| LMArena German | — | 1495 |
| LMArena Japanese | — | 1565 |
| LMArena Russian | — | 1525 |
| LMArena Spanish | — | 1503 |
Instruction Following Not comparable
AI Co-Mathematician: —, Claude Fable 5.1: 79.3 (#6)
| Benchmark | AI Co-Mathematician | Claude Fable 5.1 |
|---|---|---|
| LMArena Instruction Following | — | 1515 |
Long Context Not comparable
AI Co-Mathematician: —, Claude Fable 5.1: 46.8 (#19)
| Benchmark | AI Co-Mathematician | Claude Fable 5.1 |
|---|---|---|
| LMArena Longer Query | — | 1524 |
Writing & Preference Not comparable
AI Co-Mathematician: —, Claude Fable 5.1: 79.3 (#1)
| Benchmark | AI Co-Mathematician | Claude Fable 5.1 |
|---|---|---|
| LMArena Text | — | 1511 |
| LMArena Creative Writing | — | 1507 |
| EQ-Bench Creative Writing | — | 2162 |
| LMArena Multi-Turn | — | 1492 |
Frequently asked questions
Is AI Co-Mathematician better than Claude Fable 5.1?
Claude Fable 5.1 has enough public results to be ranked (#2); AI Co-Mathematician does not yet, so treat this comparison as directional.
How many benchmarks do AI Co-Mathematician and Claude Fable 5.1 share?
1 benchmark has published results for both models. AI Co-Mathematician has 2 scored results on Noometry and Claude Fable 5.1 has 50.