Kimi K3 vs Mistral Medium 3.5
Kimi K3 (Moonshot) and Mistral Medium 3.5 (Mistral AI) compared on benchmarks, pricing, context window, and use-case rankings.
- Kimi K3 leads on overall intelligence (ECI 158 vs 141).
- Mistral Medium 3.5 is cheaper on input tokens — $1.50 vs $2.55 per 1M.
- Kimi K3 has a larger context window (1M vs 262K tokens).
- Kimi K3 ranks higher for coding (97th vs 18th percentile).
| Attribute | Kimi K3 | Mistral Medium 3.5 |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 158 | 141 |
| Coding | 97 | 18 |
| Math | 81 | — |
| Reasoning & Knowledge | 73 | 18 |
| Agentic & Tools | 80 | 75 |
| Specifications | ||
| Developer | Moonshot | Mistral AI |
| Family | Kimi | Mistral |
| Released | Jul 16, 2026 | Apr 28, 2026 |
| Parameters | 2.8T | — |
| Availability | Open weights (non-commercial) | Open weights (restricted use) |
| Context window | 1M | 262K |
| Price — $/M input | $2.55 | $1.50 |
| Price — $/M output | $12.75 | $7.50 |
| Inputs | text, image, video | text, image, file |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 97% | — |
| APEX | 39% | — |
| ARC-AGI | 95% | — |
| ARC-AGI-2 | 60% | — |
| GPQA Diamond | 93% | 75% |
| Humanity's Last Exam | 47% | 14% |
| SciCode | 60% | 40% |
| SimpleBench | 61% | — |
| SimpleQA Verified | 51% | — |
| WebDev Arena | 1674 | 1265 |
| WeirdML | 83% | 44% |
| τ²-bench | — | 94% |
Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.
Frequently asked questions
Is Kimi K3 better than Mistral Medium 3.5?
On Epoch AI's Capabilities Index, Kimi K3 scores higher (158) than Mistral Medium 3.5 (141). The right pick depends on your task — compare their coding, math, and reasoning scores in the table above.
Which is cheaper, Kimi K3 or Mistral Medium 3.5?
Mistral Medium 3.5 is cheaper on input tokens at $1.50 per million, versus $2.55 (representative OpenRouter pricing).
Which has a larger context window, Kimi K3 or Mistral Medium 3.5?
Kimi K3 supports up to 1M tokens, compared with 262K for the other.
Which is better for coding, Kimi K3 or Mistral Medium 3.5?
Across coding benchmarks like SWE-bench Verified and Terminal-Bench, Kimi K3 ranks higher — 97th vs 18th percentile among the models tracked on Model Beat.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.