Model comparison
Kimi K2 vs Mistral Medium 3.5 128B
Head-to-head evidence from 11 shared benchmark results across 5 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Kimi K2 #199 (Supported); Mistral Medium 3.5 128B unranked (Not scored). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Kimi K2 and Mistral Medium 3.5 128B share 11 comparable benchmark results. 0 of 8 categories are comparable. 3 results are unique to Kimi K2; 14 to Mistral Medium 3.5 128B.
Updated July 27, 2026- Shared results
- 11
- Kimi K2 only
- 3
- Mistral Medium 3.5 128B only
- 14
- Comparable categories
- 0 / 8
Benchmark data for Kimi K2 and Mistral Medium 3.5 128B is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 11 shared benchmark results across 5 evidence categories; 0 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
BenchLM has partial data for these models, but not enough overlapping benchmark coverage to produce a fair score-level comparison yet.
Mistral Medium 3.5 128B is priced at $1.50 input / $7.50 output per 1M tokens, versus $0.60 input / $2.50 output per 1M tokens for Kimi K2. Mistral Medium 3.5 128B has the larger context window at 256K, compared with 128K for Kimi K2.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | Kimi K2 | Δ | Mistral Medium 3.5 128B |
|---|---|---|---|
| Coding | Kimi K2Not measured | MarginNo overlap | Mistral Medium 3.5 128B77.6 |
| Math | Kimi K216.1 | MarginNo overlap | Mistral Medium 3.5 128BNot measured |
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Kimi K2 | Mistral Medium 3.5 128B | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Kimi K2$0.6 input / $2.5 output | Mistral Medium 3.5 128B$1.5 input / $7.5 output | Kimi K2 has the lower combined listed price. |
| Generation speedtokens per second | Kimi K243 tok/s | Mistral Medium 3.5 128BNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Kimi K21.51 s | Mistral Medium 3.5 128BNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Kimi K2128K | Mistral Medium 3.5 128B256K | Mistral Medium 3.5 128B lists the larger context window. |
Benchmark Deep Dive
Agentic11 benchmarks
| Benchmark | Kimi K2 | Mistral Medium 3.5 128B | Result |
|---|---|---|---|
| τ²-bench resultsSource | 61.1% | 94.2% | Mistral Medium 3.5 128B leads |
| τ³-bench resultsSource | — | 91.4% | Not comparable |
| AA Agentic IndexSource | — | 19.0% | Not comparable |
| GDPval-AASource | — | 21.6% | Not comparable |
| GDPval-AASource | — | 933 | Not comparable |
| Gert LabsSource | — | 39.10% | Not comparable |
| AA EnterpriseOps-GymSource | — | 33.7% | Not comparable |
| AA Harvey LABSource | — | 69.1% | Not comparable |
| terminalBenchHardSource | — | 33.3% | Not comparable |
| AA BriefcaseSource | — | 516 | Not comparable |
| AA Tau3 BankingSource | — | 14.4% | Not comparable |
Coding3 benchmarks
Reasoning2 benchmarks
Knowledge7 benchmarks
| Benchmark | Kimi K2 | Mistral Medium 3.5 128B | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 19.4% | 29.9% | Mistral Medium 3.5 128B leads |
| AA-GPQA DiamondSource | 76.6% | 74.8% | Kimi K2 leads |
| AA-HLESource | 7.0% | 12.8% | Mistral Medium 3.5 128B leads |
| AA-Omniscience IndexSource | -27.5% | -36.3% | Kimi K2 leads |
| AA-Omniscience AccuracySource | 26.8% | 25.1% | Kimi K2 leads |
| AA-Omniscience Hallucination RateSource | 74.2% | 82.0% | Kimi K2 leads |
| AA Openness IndexSource | — | 33.3% | Not comparable |
Math2 benchmarks
Multimodal2 benchmarks
Inst. Following1 benchmarks
| Benchmark | Kimi K2 | Mistral Medium 3.5 128B | Result |
|---|---|---|---|
| AA-IFBenchSource | 41.5% | 68.8% | Mistral Medium 3.5 128B leads |
Frequently Asked Questions (3)
Can I compare Kimi K2 and Mistral Medium 3.5 128B on BenchLM yet?
Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.
Why does this comparison show “coming soon”?
BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.
What data is available for Kimi K2 and Mistral Medium 3.5 128B today?
Kimi K2: $0.60 input / $2.50 output per 1M tokens Mistral Medium 3.5 128B: $1.50 input / $7.50 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.
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