Model comparison
Kimi K2 (Jul 2025) vs Mistral Medium 3.1
Kimi K2 (Jul 2025) is the stronger model overall, scoring 41.2 to 31.9 on the Noometry Index.
Last verified . 1 shared benchmarks.
Mistral AISummary
- They share 1 benchmark with published results for both. Kimi K2 (Jul 2025) 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 K2 (Jul 2025) leads 23.3 to 10.6.
- Mistral Medium 3.1 is cheaper at $0.40 / $2 per million input/output tokens, against $0.57 / $2.30 for Kimi K2 (Jul 2025).
- Kimi K2 (Jul 2025) accepts more context: 262K tokens versus 131K.
- Kimi K2 (Jul 2025) has downloadable open weights; the other is API-only.
Side by side
| Kimi K2 (Jul 2025) | Mistral Medium 3.1 | |
|---|---|---|
| Provider | Moonshot AI | Mistral AI |
| Noometry Index | 41.2 | 31.9 |
| Released | 2025-07-12 | — |
| Weights | Open | Proprietary |
| Context window | 262K | 131K |
| Max output | 262K | 105K |
| Input $ / M tokens | $0.57 | $0.40 |
| Output $ / M tokens | $2.30 | $2 |
| Results tracked | 42 | 3 |
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Category by category
Coding Not comparable
Kimi K2 (Jul 2025): 42.4 (#102), Mistral Medium 3.1: —
| Benchmark | Kimi K2 (Jul 2025) | Mistral Medium 3.1 |
|---|---|---|
| SWE-bench Verified (bash only) | 63.4% | — |
| Aider Polyglot | 59.1% | — |
| GSO | 4.9% | — |
| WeirdML | 42.8% | — |
| LMArena Coding | 1399 | — |
| ALE-Bench | 597.5 | — |
Agentic & Tool Use Not comparable
Kimi K2 (Jul 2025): 32.4 (#64), Mistral Medium 3.1: —
| Benchmark | Kimi K2 (Jul 2025) | Mistral Medium 3.1 |
|---|---|---|
| Terminal-Bench | 35.7% | — |
| Berkeley Function Calling Leaderboard | 59.1% | — |
| METR Time Horizons | 59.2% | — |
Reasoning Kimi K2 (Jul 2025) leads
Kimi K2 (Jul 2025): 23.3 (#179), Mistral Medium 3.1: 10.6 (#341)
| Benchmark | Kimi K2 (Jul 2025) | Mistral Medium 3.1 |
|---|---|---|
| SimpleBench | 26.3% | — |
| Kagi LLM Benchmark | 64.4% | — |
| NYT Connections (extended) | — | 6.5% |
| Thematic Generalization | — | 20.3% |
| LMArena Hard Prompts | 1384 | — |
| Epoch Capabilities Index | 146.01 | — |
| ForecastBench | 60.2 | — |
Math Not comparable
Kimi K2 (Jul 2025): 42.7 (#83), Mistral Medium 3.1: —
| Benchmark | Kimi K2 (Jul 2025) | Mistral Medium 3.1 |
|---|---|---|
| Omni-MATH | 65.4% | — |
| LMArena Math | 1397 | — |
| FrontierMath (Feb 2025 set) | 21.4% | — |
| FrontierMath Tier 4 (v1) | 0% | — |
Knowledge Not comparable
Kimi K2 (Jul 2025): 37.3 (#157), Mistral Medium 3.1: —
| Benchmark | Kimi K2 (Jul 2025) | Mistral Medium 3.1 |
|---|---|---|
| MMLU-Pro | 81.9% | — |
| Confabulations | 20.4% | — |
| Vectara Hallucination Rate | 17.9% | — |
| GPQA (HELM) | 65.3% | — |
| LMArena Expert | 1365 | — |
Multilingual Not comparable
Kimi K2 (Jul 2025): 49.6 (#130), Mistral Medium 3.1: —
| Benchmark | Kimi K2 (Jul 2025) | Mistral Medium 3.1 |
|---|---|---|
| LMArena Non-English | 1372 | — |
| LMArena Chinese | 1415 | — |
| LMArena French | 1379 | — |
| LMArena German | 1387 | — |
| LMArena Japanese | 1349 | — |
| LMArena Korean | 1325 | — |
| LMArena Russian | 1385 | — |
| LMArena Spanish | 1386 | — |
Instruction Following Not comparable
Kimi K2 (Jul 2025): 71.1 (#156), Mistral Medium 3.1: —
| Benchmark | Kimi K2 (Jul 2025) | Mistral Medium 3.1 |
|---|---|---|
| IFEval | 85% | — |
| LMArena Instruction Following | 1348 | — |
Long Context Not comparable
Kimi K2 (Jul 2025): 41.2 (#145), Mistral Medium 3.1: —
| Benchmark | Kimi K2 (Jul 2025) | Mistral Medium 3.1 |
|---|---|---|
| Fiction.LiveBench | 66.7% | — |
| CL-bench | 17.6% | — |
| LMArena Longer Query | 1353 | — |
Writing & Preference Kimi K2 (Jul 2025) leads
Kimi K2 (Jul 2025): 62.3 (#78), Mistral Medium 3.1: 55.5 (#145)
| Benchmark | Kimi K2 (Jul 2025) | Mistral Medium 3.1 |
|---|---|---|
| EQ-Bench Creative Writing | 1666 | 1476 |
| LMArena Text | 1380 | — |
| LMArena Creative Writing | 1350 | — |
| Short-Story Creative Writing | 85.6% | — |
| WildBench | 86.2% | — |
| LMArena Multi-Turn | 1371 | — |
Frequently asked questions
Is Kimi K2 (Jul 2025) better than Mistral Medium 3.1?
Kimi K2 (Jul 2025) is the stronger model overall, scoring 41.2 to 31.9 on the Noometry Index.
Which is cheaper, Kimi K2 (Jul 2025) 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 K2 (Jul 2025) lists at $0.57 and $2.30.
Which has the bigger context window?
Kimi K2 (Jul 2025) does, with 262K tokens against 131K.
How many benchmarks do Kimi K2 (Jul 2025) and Mistral Medium 3.1 share?
1 benchmark has published results for both models. Kimi K2 (Jul 2025) has 42 scored results on Noometry and Mistral Medium 3.1 has 3.