Model comparison
Claude Fable 5 vs Mistral Small 3.1
Claude Fable 5 is the stronger model overall, scoring 66.8 to 31.7 on the Noometry Index. Mistral Small 3.1 costs 50× less per token, which makes it the better buy when Claude Fable 5's lead doesn't matter for your workload.
Last verified . 23 shared benchmarks.
Mistral AISummary
- They share 23 benchmarks with published results for both. Claude Fable 5 scores higher in 9 categories and Mistral Small 3.1 in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Fable 5 leads 88.5 to 14.7.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 100% for Claude Fable 5 and 3.9% for Mistral Small 3.1.
- Mistral Small 3.1 is cheaper at $0.35 / $0.56 per million input/output tokens, against $10 / $50 for Claude Fable 5.
- Claude Fable 5 accepts more context: 1M tokens versus 128K.
- Mistral Small 3.1 has downloadable open weights; the other is API-only.
Side by side
| Claude Fable 5 | Mistral Small 3.1 | |
|---|---|---|
| Provider | Anthropic | Mistral AI |
| Noometry Index | 66.8 | 31.7 |
| Released | 2026-06-07 | 2025-03-17 |
| Weights | Proprietary | Open |
| Context window | 1M | 128K |
| Max output | 128K | 102K |
| Input $ / M tokens | $10 | $0.35 |
| Output $ / M tokens | $50 | $0.56 |
| Results tracked | 62 | 28 |
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Category by category
Coding Claude Fable 5 leads
Claude Fable 5: 70.6 (#4), Mistral Small 3.1: 38.3 (#179)
| Benchmark | Claude Fable 5 | Mistral Small 3.1 |
|---|---|---|
| LMArena Coding | 1519 | 1309 |
| DeepSWE | 69.9% | — |
| FrontierCode | 53.5% | — |
| LMArena WebDev | 1625 | — |
| FrontierSWE | 47% | — |
| SciCode | 61% | — |
| GSO | 78.4% | — |
| WeirdML | 91.9% | — |
| MirrorCode | 63.9% | — |
| ALE-Bench | 2,041 | — |
Agentic & Tool Use Not comparable
Claude Fable 5: 54.0 (#2), Mistral Small 3.1: —
| Benchmark | Claude Fable 5 | Mistral Small 3.1 |
|---|---|---|
| APEX-Agents | 63.6% | — |
| Remote Labor Index | 16.1% | — |
| τ²-bench Banking | 39.7% | — |
| PostTrainBench | 41.8% | — |
| GBAEval | 74.5% | — |
| GDP.pdf | 30% | — |
| LMArena Search | 1230 | — |
| Vending-Bench 2 | 5,680 | — |
Reasoning Claude Fable 5 leads
Claude Fable 5: 76.8 (#6), Mistral Small 3.1: 19.7 (#254)
| Benchmark | Claude Fable 5 | Mistral Small 3.1 |
|---|---|---|
| Chess Puzzles | 41% | 1% |
| LMArena Hard Prompts | 1508 | 1278 |
| Epoch Capabilities Index | 162.06 | 127.48 |
| ARC-AGI-2 | 89.2% | — |
| SimpleBench | 81.9% | — |
| Kagi LLM Benchmark | 91.4% | — |
| NYT Connections (extended) | 92.7% | — |
| ARC-AGI-1 | 98.5% | — |
| CritPt | 28.6% | — |
| EnigmaEval | 39.3% | — |
| EBR-Bench | 39.5% | — |
| Mystery Game Puzzles | 52% | — |
| DTBench | 98.4% | — |
| LMCA | 61.1% | — |
| Surface Evolver Bench | 95% | — |
| Bench to the Future 3 | 0.13 | — |
Math Claude Fable 5 leads
Claude Fable 5: 88.5 (#5), Mistral Small 3.1: 14.7 (#301)
| Benchmark | Claude Fable 5 | Mistral Small 3.1 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 100% | 3.9% |
| LMArena Math | 1519 | 1262 |
| FrontierMath (Tiers 1-3) | 87% | — |
| FrontierMath Tier 4 | 90.2% | — |
| ProofBench | 95% | — |
| Omni-MATH | — | 24.8% |
| FrontierMath Erdős | 0% | — |
Knowledge Claude Fable 5 leads
Claude Fable 5: 62.2 (#25), Mistral Small 3.1: 22.6 (#271)
| Benchmark | Claude Fable 5 | Mistral Small 3.1 |
|---|---|---|
| GPQA Diamond | 85.9% | 41.9% |
| LMArena Expert | 1534 | 1257 |
| SimpleQA Verified | 70.7% | — |
| MMLU-Pro | — | 61% |
| GPQA (HELM) | — | 39.2% |
Multimodal Claude Fable 5 leads
Claude Fable 5: 45.3 (#17), Mistral Small 3.1: 33.2 (#99)
| Benchmark | Claude Fable 5 | Mistral Small 3.1 |
|---|---|---|
| LMArena Vision | 1324 | 1136 |
| Blueprint-Bench 2 | 38.6% | — |
| Furniture Assembly | 35.8% | — |
| LMArena Document | 1496 | — |
Multilingual Claude Fable 5 leads
Claude Fable 5: 57.3 (#9), Mistral Small 3.1: 41.2 (#209)
| Benchmark | Claude Fable 5 | Mistral Small 3.1 |
|---|---|---|
| LMArena Non-English | 1481 | 1255 |
| LMArena Chinese | 1543 | 1253 |
| LMArena French | 1505 | 1273 |
| LMArena German | 1486 | 1266 |
| LMArena Japanese | 1506 | 1208 |
| LMArena Korean | 1488 | 1206 |
| LMArena Russian | 1504 | 1263 |
| LMArena Spanish | 1498 | 1283 |
Instruction Following Claude Fable 5 leads
Claude Fable 5: 78.6 (#8), Mistral Small 3.1: 63.6 (#230)
| Benchmark | Claude Fable 5 | Mistral Small 3.1 |
|---|---|---|
| LMArena Instruction Following | 1502 | 1264 |
| IFEval | — | 75% |
Long Context Claude Fable 5 leads
Claude Fable 5: 46.3 (#23), Mistral Small 3.1: 39.5 (#178)
| Benchmark | Claude Fable 5 | Mistral Small 3.1 |
|---|---|---|
| LMArena Longer Query | 1509 | 1299 |
Writing & Preference Claude Fable 5 leads
Claude Fable 5: 75.9 (#5), Mistral Small 3.1: 37.0 (#259)
| Benchmark | Claude Fable 5 | Mistral Small 3.1 |
|---|---|---|
| LMArena Text | 1491 | 1277 |
| LMArena Creative Writing | 1494 | 1253 |
| EQ-Bench Creative Writing | 1943 | 761 |
| LMArena Multi-Turn | 1504 | 1270 |
| WildBench | — | 78.8% |
| EQ-Bench 4 | 1340 | — |
Frequently asked questions
Is Claude Fable 5 better than Mistral Small 3.1?
Claude Fable 5 is the stronger model overall, scoring 66.8 to 31.7 on the Noometry Index. Mistral Small 3.1 costs 50× less per token, which makes it the better buy when Claude Fable 5's lead doesn't matter for your workload.
Which is cheaper, Claude Fable 5 or Mistral Small 3.1?
Mistral Small 3.1 is cheaper. It lists at $0.35 per million input tokens and $0.56 per million output tokens; Claude Fable 5 lists at $10 and $50.
Is Claude Fable 5 or Mistral Small 3.1 better for coding?
Claude Fable 5 scores higher on coding benchmarks: 70.6 versus 38.3 in the Noometry coding category.
Which has the bigger context window?
Claude Fable 5 does, with 1M tokens against 128K.
How many benchmarks do Claude Fable 5 and Mistral Small 3.1 share?
23 benchmarks have published results for both models. Claude Fable 5 has 62 scored results on Noometry and Mistral Small 3.1 has 28.