Model comparison
Kimi K3 vs Mistral Medium 3.1
Kimi K3 is the stronger model overall, scoring 59.5 to 31.9 on the Noometry Index. Mistral Medium 3.1 costs 7.5× less per token, which makes it the better buy when Kimi K3's lead doesn't matter for your workload.
Last verified . 2 shared benchmarks.
Mistral AISummary
- They share 2 benchmarks with published results for both. Kimi K3 scores higher in 2 categories and Mistral Medium 3.1 in 0 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Kimi K3 leads 63.0 to 10.6.
- The biggest single-benchmark swing is NYT Connections (extended): 93.6% for Kimi K3 and 6.5% for Mistral Medium 3.1.
- Mistral Medium 3.1 is cheaper at $0.40 / $2 per million input/output tokens, against $3 / $15 for Kimi K3.
- Kimi K3 accepts more context: 1.05M tokens versus 131K.
- Kimi K3 has downloadable open weights; the other is API-only.
Side by side
| Kimi K3 | Mistral Medium 3.1 | |
|---|---|---|
| Provider | Moonshot AI | Mistral AI |
| Noometry Index | 59.5 | 31.9 |
| Released | 2026-07-16 | — |
| Weights | Open | Proprietary |
| Context window | 1.05M | 131K |
| Max output | 1.05M | 105K |
| Input $ / M tokens | $3 | $0.40 |
| Output $ / M tokens | $15 | $2 |
| Results tracked | 53 | 3 |
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Category by category
Coding Not comparable
Kimi K3: 61.0 (#10), Mistral Medium 3.1: —
| Benchmark | Kimi K3 | Mistral Medium 3.1 |
|---|---|---|
| DeepSWE | 68.5% | — |
| FrontierCode | 44.2% | — |
| LMArena WebDev | 1654 | — |
| FrontierSWE | 25.9% | — |
| SciCode | 59.5% | — |
| WeirdML | 82.6% | — |
| LMArena Coding | 1508 | — |
| ALE-Bench | 1,524 | — |
Agentic & Tool Use Not comparable
Kimi K3: 41.8 (#20), Mistral Medium 3.1: —
| Benchmark | Kimi K3 | Mistral Medium 3.1 |
|---|---|---|
| APEX-Agents | 50.6% | — |
| τ²-bench Banking | 37.1% | — |
| PostTrainBench | 32% | — |
| GBAEval | 48.3% | — |
| GDP.pdf | 19% | — |
| Vending-Bench 2 | 5,165 | — |
Reasoning Kimi K3 leads
Kimi K3: 63.0 (#17), Mistral Medium 3.1: 10.6 (#341)
| Benchmark | Kimi K3 | Mistral Medium 3.1 |
|---|---|---|
| NYT Connections (extended) | 93.6% | 6.5% |
| ARC-AGI-2 | 60.4% | — |
| SimpleBench | 60.7% | — |
| ARC-AGI-1 | 94.5% | — |
| CritPt | 23.4% | — |
| Chess Puzzles | 39% | — |
| Thematic Generalization | — | 20.3% |
| LMArena Hard Prompts | 1496 | — |
| Mystery Game Puzzles | 26% | — |
| DTBench | 91.2% | — |
| LMCA | 52.7% | — |
| Surface Evolver Bench | 95% | — |
| Epoch Capabilities Index | 157.45 | — |
| ForecastBench | 61.1 | — |
Math Not comparable
Kimi K3: 74.2 (#16), Mistral Medium 3.1: —
| Benchmark | Kimi K3 | Mistral Medium 3.1 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 72.2% | — |
| FrontierMath Tier 4 | 39% | — |
| MathArena Final-Answer Competitions | 87.8% | — |
| OTIS Mock AIME 2024-2025 | 97.2% | — |
| ProofBench | 87% | — |
| LMArena Math | 1491 | — |
Knowledge Not comparable
Kimi K3: 63.2 (#21), Mistral Medium 3.1: —
| Benchmark | Kimi K3 | Mistral Medium 3.1 |
|---|---|---|
| GPQA Diamond | 93.1% | — |
| SimpleQA Verified | 50.6% | — |
| LMArena Expert | 1521 | — |
Multimodal Not comparable
Kimi K3: 37.8 (#70), Mistral Medium 3.1: —
| Benchmark | Kimi K3 | Mistral Medium 3.1 |
|---|---|---|
| Blueprint-Bench 2 | 29.5% | — |
| Furniture Assembly | 34.2% | — |
Multilingual Not comparable
Kimi K3: 56.3 (#21), Mistral Medium 3.1: —
| Benchmark | Kimi K3 | Mistral Medium 3.1 |
|---|---|---|
| LMArena Non-English | 1466 | — |
| LMArena Chinese | 1529 | — |
| LMArena French | 1491 | — |
| LMArena German | 1488 | — |
| LMArena Japanese | 1487 | — |
| LMArena Korean | 1458 | — |
| LMArena Russian | 1482 | — |
| LMArena Spanish | 1472 | — |
Instruction Following Not comparable
Kimi K3: 77.7 (#14), Mistral Medium 3.1: —
| Benchmark | Kimi K3 | Mistral Medium 3.1 |
|---|---|---|
| LMArena Instruction Following | 1483 | — |
Long Context Not comparable
Kimi K3: 45.8 (#29), Mistral Medium 3.1: —
| Benchmark | Kimi K3 | Mistral Medium 3.1 |
|---|---|---|
| LMArena Longer Query | 1494 | — |
Writing & Preference Kimi K3 leads
Kimi K3: 76.6 (#4), Mistral Medium 3.1: 55.5 (#145)
| Benchmark | Kimi K3 | Mistral Medium 3.1 |
|---|---|---|
| EQ-Bench Creative Writing | 2082 | 1476 |
| LMArena Text | 1476 | — |
| LMArena Creative Writing | 1454 | — |
| EQ-Bench 4 | 1339 | — |
| LMArena Multi-Turn | 1488 | — |
Frequently asked questions
Is Kimi K3 better than Mistral Medium 3.1?
Kimi K3 is the stronger model overall, scoring 59.5 to 31.9 on the Noometry Index. Mistral Medium 3.1 costs 7.5× less per token, which makes it the better buy when Kimi K3's lead doesn't matter for your workload.
Which is cheaper, Kimi K3 or Mistral Medium 3.1?
Mistral Medium 3.1 is cheaper. It lists at $0.40 per million input tokens and $2 per million output tokens; Kimi K3 lists at $3 and $15.
Which has the bigger context window?
Kimi K3 does, with 1.05M tokens against 131K.
How many benchmarks do Kimi K3 and Mistral Medium 3.1 share?
2 benchmarks have published results for both models. Kimi K3 has 53 scored results on Noometry and Mistral Medium 3.1 has 3.