Mistral Medium 3.5 vs Kimi K3
Mistral Medium 3.5 vs Kimi K3: 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 2.0× cheaper than Kimi K3 for the same mix of input and output tokens.
- Kimi K3 has the larger context window (1M), useful for long documents and big codebases.
- Kimi K3 is the more recent release (Jul 16, 2026).
- Only Kimi K3 has openly published weights you can run yourself.
- Kimi K3 scores higher on independent tests (overall index 157.7 vs 141.4).
- Choose Mistral Medium 3.5 if cost matters most; choose Kimi K3 if you need its specific strengths above. For the best results, test both on your own prompts.
| Mistral Medium 3.5 | Kimi K3 | |
|---|---|---|
| Company | Mistral AI | Moonshot AI |
| Released | Apr 30, 2026 | Jul 16, 2026 ● |
| Overall index | 141.4 | 157.7 ● |
| GPQA Diamond | — | 93.1% |
| AIME math | — | 97.2% |
| FrontierMath | — | 72.2% |
| SimpleQA Verified | — | 50.6% |
| Input (per 1M tokens) | $1.50 ● | $3 |
| Output (per 1M tokens) | $7.50 ● | $15 |
| Cost for 1M input + 1M output tokens | $9.00 ● | $18.00 |
| Providers | 3 | 22 ● |
| Context | 256K | 1M ● |
| Max output | 210K | 944K ● |
| Inputs | Text, Image, Files | Text, Image, Video |
| Outputs | Text | Text |
| Reasoning | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Open weights | — | ✓ |