Model comparison
Claude Fable 5.1 vs Ministral 8B
Claude Fable 5.1 is the stronger model overall, scoring 69.0 to 28.2 on the Noometry Index. Ministral 8B costs 133× less per token, which makes it the better buy when Claude Fable 5.1's lead doesn't matter for your workload.
Last verified . 13 shared benchmarks.
Mistral AISummary
- They share 13 benchmarks with published results for both. Claude Fable 5.1 scores higher in 9 categories and Ministral 8B 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 25.7.
- The biggest single-benchmark swing is DTBench: 97.6% for Claude Fable 5.1 and 45.7% for Ministral 8B.
- Ministral 8B is cheaper at $0.15 / $0.15 per million input/output tokens, against $10 / $50 for Claude Fable 5.1.
- Claude Fable 5.1 accepts more context: 1M tokens versus 262K.
- Ministral 8B has downloadable open weights; the other is API-only.
Side by side
| Claude Fable 5.1 | Ministral 8B | |
|---|---|---|
| Provider | Anthropic | Mistral AI |
| Noometry Index | 69.0 | 28.2 |
| Released | 2026-09-01 | 2024-10-01 |
| Weights | Proprietary | Open |
| Context window | 1M | 262K |
| Max output | 128K | 262K |
| Input $ / M tokens | $10 | $0.15 |
| Output $ / M tokens | $50 | $0.15 |
| Results tracked | 52 | 17 |
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Category by category
Coding Claude Fable 5.1 leads
Claude Fable 5.1: 74.7 (#1), Ministral 8B: 35.0 (#230)
| Benchmark | Claude Fable 5.1 | Ministral 8B |
|---|---|---|
| LMArena Coding | 1528 | 1202 |
| 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 Claude Fable 5.1 leads
Claude Fable 5.1: 50.7 (#5), Ministral 8B: 16.4 (#148)
| Benchmark | Claude Fable 5.1 | Ministral 8B |
|---|---|---|
| APEX-Agents | 68.6% | — |
| Berkeley Function Calling Leaderboard | — | 11.1% |
| 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), Ministral 8B: 18.4 (#281)
| Benchmark | Claude Fable 5.1 | Ministral 8B |
|---|---|---|
| LMArena Hard Prompts | 1526 | 1191 |
| DTBench | 97.6% | 45.7% |
| 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% | — |
| LMCA | 65.5% | — |
| Epoch Capabilities Index | 164.7 | — |
Math Claude Fable 5.1 leads
Claude Fable 5.1: 89.6 (#4), Ministral 8B: 25.7 (#267)
| Benchmark | Claude Fable 5.1 | Ministral 8B |
|---|---|---|
| LMArena Math | 1525 | 1188 |
| FrontierMath (Tiers 1-3) | 90.2% | — |
| FrontierMath Tier 4 | 87.8% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 100% | — |
| MATH Level 5 | — | 14.9% |
| FrontierMath Erdős | 0% | — |
Knowledge Claude Fable 5.1 leads
Claude Fable 5.1: 69.6 (#6), Ministral 8B: 12.6 (#297)
| Benchmark | Claude Fable 5.1 | Ministral 8B |
|---|---|---|
| LMArena Expert | 1535 | 1170 |
| GPQA Diamond | — | 27.1% |
| Humanity's Last Exam | 46.5% | — |
| SimpleQA Verified | 70.8% | — |
| Vectara Hallucination Rate | — | 7.4% |
Multimodal Not comparable
Claude Fable 5.1: 53.9 (#4), Ministral 8B: —
| Benchmark | Claude Fable 5.1 | Ministral 8B |
|---|---|---|
| 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), Ministral 8B: 35.1 (#247)
| Benchmark | Claude Fable 5.1 | Ministral 8B |
|---|---|---|
| LMArena Non-English | 1507 | 1165 |
| LMArena Chinese | 1586 | 1193 |
| LMArena Russian | 1521 | 1195 |
| LMArena French | 1525 | — |
| LMArena German | 1500 | — |
| LMArena Japanese | 1543 | — |
| LMArena Korean | 1534 | — |
| LMArena Spanish | 1516 | — |
Instruction Following Claude Fable 5.1 leads
Claude Fable 5.1: 79.2 (#6), Ministral 8B: 60.5 (#250)
| Benchmark | Claude Fable 5.1 | Ministral 8B |
|---|---|---|
| LMArena Instruction Following | 1517 | 1161 |
Long Context Claude Fable 5.1 leads
Claude Fable 5.1: 46.7 (#20), Ministral 8B: 36.7 (#227)
| Benchmark | Claude Fable 5.1 | Ministral 8B |
|---|---|---|
| LMArena Longer Query | 1522 | 1212 |
Writing & Preference Claude Fable 5.1 leads
Claude Fable 5.1: 79.2 (#2), Ministral 8B: 39.6 (#246)
| Benchmark | Claude Fable 5.1 | Ministral 8B |
|---|---|---|
| LMArena Text | 1510 | 1191 |
| LMArena Creative Writing | 1507 | 1175 |
| LMArena Multi-Turn | 1492 | 1166 |
| EQ-Bench Creative Writing | 2162 | — |
Frequently asked questions
Is Claude Fable 5.1 better than Ministral 8B?
Claude Fable 5.1 is the stronger model overall, scoring 69.0 to 28.2 on the Noometry Index. Ministral 8B costs 133× less per token, which makes it the better buy when Claude Fable 5.1's lead doesn't matter for your workload.
Which is cheaper, Claude Fable 5.1 or Ministral 8B?
Ministral 8B is cheaper. It lists at $0.15 per million input tokens and $0.15 per million output tokens; Claude Fable 5.1 lists at $10 and $50.
Is Claude Fable 5.1 or Ministral 8B better for coding?
Claude Fable 5.1 scores higher on coding benchmarks: 74.7 versus 35.0 in the Noometry coding category.
Which has the bigger context window?
Claude Fable 5.1 does, with 1M tokens against 262K.
How many benchmarks do Claude Fable 5.1 and Ministral 8B share?
13 benchmarks have published results for both models. Claude Fable 5.1 has 52 scored results on Noometry and Ministral 8B has 17.