# Kimi K2.6 vs Mistral Medium 3.5 128B

> Side-by-side benchmark comparison for Kimi K2.6 and Mistral Medium 3.5 128B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/kimi-2-6-vs-mistral-medium-3-5-128b
- Last updated: September 10, 2026

- Shared sourced benchmarks: 6
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Pick Kimi K2.6 if you want the stronger benchmark profile. Mistral Medium 3.5 128B only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Kimi K2.6 leads overall 65.39 to 30.13.
- The clearest category separation is in agentic, where the averages are 46.7 for Kimi K2.6 and 21.9 for Mistral Medium 3.5 128B.
- The biggest single benchmark swing is GPQA Diamond (Vals) in Knowledge, with scores of 89.1% and 34.8%.
- Kimi K2.6 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.

## Model Snapshot

| Property | Kimi K2.6 | Mistral Medium 3.5 128B |
|----------|----------|----------|
| Creator | Moonshot AI | Mistral |
| Type | Open Weight | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 256K | 256K |
| Overall Score | 65.39 | 30.13 |
| Benchmarks Covered | 37 | 7 |
| Pricing (input/output) | $0.95 / $4.00 | $1.50 / $7.50 |

## Category Breakdown

### Agentic

- Winner: Kimi K2.6
- Kimi K2.6 public-lane score: 46.7 (Supported · #74/152)
- Mistral Medium 3.5 128B public-lane score: 21.9 (Supported · #150/152)

| Benchmark | Kimi K2.6 | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 66.7% | Coming soon | Coming soon |
| BrowseComp | 83.2% | Coming soon | Coming soon |
| OSWorld-Verified | 73.1% | Coming soon | Coming soon |
| Toolathlon | 50% | Coming soon | Coming soon |
| MCP Atlas | 55.9% | Coming soon | Coming soon |
| Claw-Eval | 62.3% | Coming soon | Coming soon |
| DeepSearchQA | 92.5% | Coming soon | Coming soon |
| WideResearch | 80.8% | Coming soon | Coming soon |
| Gert Labs | 56.82% | 39.10% | Kimi K2.6 |
| ResearchClawBench | 18.0% | Coming soon | Coming soon |
| OSWorld 2.0 | 4.6% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 53.6% | 39.0% | Kimi K2.6 |
| τ³-bench results | Coming soon | 91.4% | Coming soon |

### Coding

- Winner: Coming soon
- Kimi K2.6 public-lane score: 50.8 (Supported · #52/151)
- Mistral Medium 3.5 128B public-lane score: 36.9 (Estimated · #127/151)

| Benchmark | Kimi K2.6 | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 80.2% | 77.6% | Kimi K2.6 |
| LiveCodeBench v6 | 89.6% | Coming soon | Coming soon |
| SWE-bench Pro | 58.6% | Coming soon | Coming soon |
| SWE Multilingual | 76.7% | Coming soon | Coming soon |
| SciCode | 52.2% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | 66.7% | Coming soon | Coming soon |
| Vibe Code Bench | 37.89% | Coming soon | Coming soon |
| cursorBench31 | 47.6% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 86.8% | Coming soon | Coming soon |
| SWE-bench (Vals) | 76.2% | 66.4% | Kimi K2.6 |

### Multimodal & Grounded

- Winner: Coming soon
- Kimi K2.6 public-lane score: 64 (#26/48)
- Mistral Medium 3.5 128B public-lane score: 55.6 (Unranked · 1 rankable row)

| Benchmark | Kimi K2.6 | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 79.4% | Coming soon | Coming soon |
| MMMU-Pro w/ Python | 80.1% | Coming soon | Coming soon |
| CharXiv | 80.4% | Coming soon | Coming soon |
| MathVision | 87.4% | Coming soon | Coming soon |
| V* | 96.9% | Coming soon | Coming soon |

### Reasoning

- Winner: Coming soon
- Kimi K2.6 public-lane score: Coming soon
- Mistral Medium 3.5 128B public-lane score: 68.6 (Unranked · 2 rankable rows)

### Knowledge

- Winner: Kimi K2.6
- Kimi K2.6 public-lane score: 61.5 (Supported · #32/183)
- Mistral Medium 3.5 128B public-lane score: 39 (Supported · #140/183)

| Benchmark | Kimi K2.6 | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 90.5% | Coming soon | Coming soon |
| GPQA-D | 90.5% | Coming soon | Coming soon |
| HLE | 34.7% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 89.1% | 34.8% | Kimi K2.6 |
| MMLU-Pro (Vals) | 87.6% | 75.3% | Kimi K2.6 |

### Instruction Following

- Winner: Coming soon
- Kimi K2.6 public-lane score: Coming soon
- Mistral Medium 3.5 128B public-lane score: 84 (#48/123)

### Mathematics

- Winner: Coming soon
- Kimi K2.6 public-lane score: 71.3 (#1/7)
- Mistral Medium 3.5 128B public-lane score: Coming soon

| Benchmark | Kimi K2.6 | Mistral Medium 3.5 128B | Winner |
|-----------|-----------|-----------|--------|
| AIME26 | 96.4% | Coming soon | Coming soon |
| HMMT Feb 2026 | 92.7% | Coming soon | Coming soon |
| MMAnswerBench | 86.0% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 38.966% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 14.580% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Kimi K2.6 or Mistral Medium 3.5 128B?

Kimi K2.6 is ahead overall on BenchLM right now.

### Where is the biggest gap between Kimi K2.6 and Mistral Medium 3.5 128B?

The widest category gap is in agentic, where the averages are 46.7 for Kimi K2.6 and 21.9 for Mistral Medium 3.5 128B.

### How many benchmarks does Kimi K2.6 cover on BenchLM?

Kimi K2.6 currently has 37 sourced benchmark scores on BenchLM.

### How many benchmarks does Mistral Medium 3.5 128B cover on BenchLM?

Mistral Medium 3.5 128B currently has 7 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Kimi K2.6 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-kimi-2-6)
- [Mistral Medium 3.5 128B vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-mistral-medium-3-5-128b)
- [Kimi K2.6 vs GPT-6 Astra](/compare/gpt-6-astra-vs-kimi-2-6)
- [Mistral Medium 3.5 128B vs GPT-6 Astra](/compare/gpt-6-astra-vs-mistral-medium-3-5-128b)

## Explore More

- [Kimi K2.6 profile](/models/kimi-2-6)
- [Mistral Medium 3.5 128B profile](/models/mistral-medium-3-5-128b)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)