Claude Fable 5.1 vs Mistral Medium 3.5
Claude Fable 5.1 vs Mistral Medium 3.5: which AI model is cheaper, has the larger context window and more capabilities? Side-by-side comparison updated daily.
Quick verdict
- Mistral Medium 3.5 is 6.7× cheaper than Claude Fable 5.1 for the same mix of input and output tokens.
- Claude Fable 5.1 has the larger context window (1M), useful for long documents and big codebases.
- Claude Fable 5.1 is the more recent release (Sep 1, 2026).
- Claude Fable 5.1 scores higher on independent tests (overall index 165.0 vs 141.4).
- Choose Mistral Medium 3.5 if cost matters most; choose Claude Fable 5.1 if you need its specific strengths above. For the best results, test both on your own prompts.
| Claude Fable 5.1 | Mistral Medium 3.5 | |
|---|---|---|
| Company | Anthropic | Mistral AI |
| Released | Sep 1, 2026 ● | Apr 30, 2026 |
| Overall index | 165.0 ● | 141.4 |
| AIME math | 100% | — |
| FrontierMath | 90.2% | — |
| SimpleQA Verified | 70.8% | — |
| Input (per 1M tokens) | $10 | $1.50 ● |
| Output (per 1M tokens) | $50 | $7.50 ● |
| Cost for 1M input + 1M output tokens | $60.00 | $9.00 ● |
| Providers | 4 ● | 3 |
| Context | 1M ● | 256K |
| Max output | 128K | 210K ● |
| Inputs | Text, Image, Files | Text, Image, Files |
| Outputs | Text | Text |
| Reasoning | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Open weights | — | — |