Model comparison
Kimi K2.5 vs Mistral Medium 3.1
Kimi K2.5 is the stronger model overall, scoring 48.1 to 31.9 on the Noometry Index.
Last verified . 3 shared benchmarks.
Mistral AISummary
- They share 3 benchmarks with published results for both. Kimi K2.5 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 K2.5 leads 31.2 to 10.6.
- The biggest single-benchmark swing is NYT Connections (extended): 69.9% for Kimi K2.5 and 6.5% for Mistral Medium 3.1.
- Mistral Medium 3.1 is cheaper at $0.40 / $2 per million input/output tokens, against $0.45 / $2.25 for Kimi K2.5.
- Kimi K2.5 accepts more context: 262K tokens versus 131K.
- Kimi K2.5 has downloadable open weights; the other is API-only.
Side by side
| Kimi K2.5 | Mistral Medium 3.1 | |
|---|---|---|
| Provider | Moonshot AI | Mistral AI |
| Noometry Index | 48.1 | 31.9 |
| Released | 2026-01-27 | — |
| Weights | Open | Proprietary |
| Context window | 262K | 131K |
| Max output | 262K | 105K |
| Input $ / M tokens | $0.45 | $0.40 |
| Output $ / M tokens | $2.25 | $2 |
| Results tracked | 51 | 3 |
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Category by category
Coding Not comparable
Kimi K2.5: 48.8 (#53), Mistral Medium 3.1: —
| Benchmark | Kimi K2.5 | Mistral Medium 3.1 |
|---|---|---|
| SWE-bench Verified | 73.8% | — |
| SWE-bench Verified (bash only) | 70.8% | — |
| LMArena WebDev | 1437 | — |
| SWE-bench Multilingual | 67.3% | — |
| SciCode | 49% | — |
| WeirdML | 45.6% | — |
| LMArena Coding | 1474 | — |
| ALE-Bench | 821.65 | — |
Agentic & Tool Use Not comparable
Kimi K2.5: 34.2 (#48), Mistral Medium 3.1: —
| Benchmark | Kimi K2.5 | Mistral Medium 3.1 |
|---|---|---|
| Terminal-Bench | 43.2% | — |
| OSWorld | 63.3% | — |
| Vending-Bench 2 | 1,198 | — |
Reasoning Kimi K2.5 leads
Kimi K2.5: 31.2 (#80), Mistral Medium 3.1: 10.6 (#341)
| Benchmark | Kimi K2.5 | Mistral Medium 3.1 |
|---|---|---|
| NYT Connections (extended) | 69.9% | 6.5% |
| Thematic Generalization | 69.4% | 20.3% |
| ARC-AGI-2 | 11.8% | — |
| SimpleBench | 46.8% | — |
| Kagi LLM Benchmark | 78.5% | — |
| ARC-AGI-1 | 65.3% | — |
| CritPt | 3.1% | — |
| Chess Puzzles | 12% | — |
| EnigmaEval | 3.4% | — |
| LMArena Hard Prompts | 1453 | — |
| Epoch Capabilities Index | 148.03 | — |
Math Not comparable
Kimi K2.5: 51.8 (#53), Mistral Medium 3.1: —
| Benchmark | Kimi K2.5 | Mistral Medium 3.1 |
|---|---|---|
| MathArena Final-Answer Competitions | 62.3% | — |
| OTIS Mock AIME 2024-2025 | 92.2% | — |
| LMArena Math | 1470 | — |
| FrontierMath (Feb 2025 set) | 27.9% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Not comparable
Kimi K2.5: 53.6 (#56), Mistral Medium 3.1: —
| Benchmark | Kimi K2.5 | Mistral Medium 3.1 |
|---|---|---|
| GPQA Diamond | 87.6% | — |
| Humanity's Last Exam | 24.4% | — |
| SimpleQA Verified | 34.3% | — |
| Vectara Hallucination Rate | 14.2% | — |
| LMArena Expert | 1466 | — |
Multimodal Not comparable
Kimi K2.5: 41.1 (#39), Mistral Medium 3.1: —
| Benchmark | Kimi K2.5 | Mistral Medium 3.1 |
|---|---|---|
| LMArena Vision | 1269 | — |
| LMArena Document | 1430 | — |
Multilingual Not comparable
Kimi K2.5: 53.9 (#53), Mistral Medium 3.1: —
| Benchmark | Kimi K2.5 | Mistral Medium 3.1 |
|---|---|---|
| LMArena Non-English | 1433 | — |
| LMArena Chinese | 1495 | — |
| LMArena French | 1454 | — |
| LMArena German | 1441 | — |
| LMArena Japanese | 1421 | — |
| LMArena Korean | 1410 | — |
| LMArena Russian | 1435 | — |
| LMArena Spanish | 1450 | — |
Instruction Following Not comparable
Kimi K2.5: 75.3 (#64), Mistral Medium 3.1: —
| Benchmark | Kimi K2.5 | Mistral Medium 3.1 |
|---|---|---|
| LMArena Instruction Following | 1431 | — |
Long Context Not comparable
Kimi K2.5: 52.1 (#7), Mistral Medium 3.1: —
| Benchmark | Kimi K2.5 | Mistral Medium 3.1 |
|---|---|---|
| Fiction.LiveBench | 86.1% | — |
| CL-bench | 19.3% | — |
| CL-bench Life | 13.2% | — |
| LMArena Longer Query | 1445 | — |
Writing & Preference Kimi K2.5 leads
Kimi K2.5: 65.1 (#53), Mistral Medium 3.1: 55.5 (#145)
| Benchmark | Kimi K2.5 | Mistral Medium 3.1 |
|---|---|---|
| EQ-Bench Creative Writing | 1579 | 1476 |
| LMArena Text | 1445 | — |
| LMArena Creative Writing | 1423 | — |
| LMArena Multi-Turn | 1444 | — |
Frequently asked questions
Is Kimi K2.5 better than Mistral Medium 3.1?
Kimi K2.5 is the stronger model overall, scoring 48.1 to 31.9 on the Noometry Index.
Which is cheaper, Kimi K2.5 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 K2.5 lists at $0.45 and $2.25.
Which has the bigger context window?
Kimi K2.5 does, with 262K tokens against 131K.
How many benchmarks do Kimi K2.5 and Mistral Medium 3.1 share?
3 benchmarks have published results for both models. Kimi K2.5 has 51 scored results on Noometry and Mistral Medium 3.1 has 3.