Model comparison
Claude Fable 5.1 vs Kimi K2.5 Instant
Claude Fable 5.1 is the stronger model overall, scoring 69.0 to 43.6 on the Noometry Index.
Last verified . 18 shared benchmarks.
Summary
- They share 18 benchmarks with published results for both. Claude Fable 5.1 scores higher in 9 categories and Kimi K2.5 Instant 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 39.4.
- Kimi K2.5 Instant has downloadable open weights; the other is API-only.
Side by side
| Claude Fable 5.1 | Kimi K2.5 Instant | |
|---|---|---|
| Provider | Anthropic | Moonshot AI |
| Noometry Index | 69.0 | 43.6 |
| Released | 2026-09-01 | — |
| Weights | Proprietary | Open |
| Context window | 1M | — |
| Max output | 128K | — |
| Input $ / M tokens | $10 | — |
| Output $ / M tokens | $50 | — |
| Results tracked | 52 | 18 |
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Category by category
Coding Claude Fable 5.1 leads
Claude Fable 5.1: 74.7 (#1), Kimi K2.5 Instant: 42.6 (#97)
| Benchmark | Claude Fable 5.1 | Kimi K2.5 Instant |
|---|---|---|
| LMArena WebDev | 1744 | 1404 |
| LMArena Coding | 1528 | 1484 |
| FrontierCode | 50.9% | — |
| CursorBench | 51.8% | — |
| 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), Kimi K2.5 Instant: —
| Benchmark | Claude Fable 5.1 | Kimi K2.5 Instant |
|---|---|---|
| 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), Kimi K2.5 Instant: 29.7 (#90)
| Benchmark | Claude Fable 5.1 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Hard Prompts | 1526 | 1443 |
| 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), Kimi K2.5 Instant: 39.4 (#105)
| Benchmark | Claude Fable 5.1 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Math | 1525 | 1442 |
| 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), Kimi K2.5 Instant: 40.2 (#123)
| Benchmark | Claude Fable 5.1 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Expert | 1535 | 1440 |
| Humanity's Last Exam | 46.5% | — |
| SimpleQA Verified | 70.8% | — |
Multimodal Claude Fable 5.1 leads
Claude Fable 5.1: 53.9 (#4), Kimi K2.5 Instant: 40.2 (#50)
| Benchmark | Claude Fable 5.1 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Vision | 1318 | 1254 |
| Blueprint-Bench 2 | 41.9% | — |
| Furniture Assembly | 70% | — |
| LMArena Document | 1513 | — |
Multilingual Claude Fable 5.1 leads
Claude Fable 5.1: 59.1 (#3), Kimi K2.5 Instant: 52.0 (#94)
| Benchmark | Claude Fable 5.1 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Non-English | 1507 | 1406 |
| LMArena Chinese | 1586 | 1449 |
| LMArena French | 1525 | 1403 |
| LMArena German | 1500 | 1413 |
| LMArena Korean | 1534 | 1378 |
| LMArena Russian | 1521 | 1404 |
| LMArena Spanish | 1516 | 1447 |
| LMArena Japanese | 1543 | — |
Instruction Following Claude Fable 5.1 leads
Claude Fable 5.1: 79.2 (#6), Kimi K2.5 Instant: 75.3 (#65)
| Benchmark | Claude Fable 5.1 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Instruction Following | 1517 | 1430 |
Long Context Claude Fable 5.1 leads
Claude Fable 5.1: 46.7 (#20), Kimi K2.5 Instant: 43.9 (#83)
| Benchmark | Claude Fable 5.1 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Longer Query | 1522 | 1435 |
Writing & Preference Claude Fable 5.1 leads
Claude Fable 5.1: 79.2 (#2), Kimi K2.5 Instant: 60.6 (#95)
| Benchmark | Claude Fable 5.1 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Text | 1510 | 1420 |
| LMArena Creative Writing | 1507 | 1381 |
| LMArena Multi-Turn | 1492 | 1427 |
| EQ-Bench Creative Writing | 2162 | — |
Frequently asked questions
Is Claude Fable 5.1 better than Kimi K2.5 Instant?
Claude Fable 5.1 is the stronger model overall, scoring 69.0 to 43.6 on the Noometry Index.
Is Claude Fable 5.1 or Kimi K2.5 Instant better for coding?
Claude Fable 5.1 scores higher on coding benchmarks: 74.7 versus 42.6 in the Noometry coding category.
How many benchmarks do Claude Fable 5.1 and Kimi K2.5 Instant share?
18 benchmarks have published results for both models. Claude Fable 5.1 has 52 scored results on Noometry and Kimi K2.5 Instant has 18.