# Kimi K2.6 vs Mercury 2.5

> Kimi K2.6 has enough public results to be ranked (#52); Mercury 2.5 does not yet, so treat this comparison as directional.

- Canonical page: https://noometry.com/compare/kimi-k2-6-vs-mercury-2-5
- Last updated: 2026-10-10
- Shared benchmarks: 2

## Summary

- They share 2 benchmarks with published results for both. Kimi K2.6 scores higher in 1 category and Mercury 2.5 in 0 categories; one gap is clear of the uncertainty.
- The widest gap is in math, where Kimi K2.6 leads 56.8 to 22.4.
- The biggest single-benchmark swing is ProofBench: 16% for Kimi K2.6 and 3% for Mercury 2.5.
- Mercury 2.5 is cheaper at $0.04 / $0.15 per million input/output tokens, against $0.95 / $4 for Kimi K2.6.
- Kimi K2.6 accepts more context: 262K tokens versus 260K.
- Kimi K2.6 has downloadable open weights; the other is API-only.

## Snapshot

| | Kimi K2.6 | Mercury 2.5 |
|---|---|---|
| Provider | Moonshot AI | Inception |
| Noometry Index | 47.5 | 30.2 |
| Rank | 52 | — |
| Context | 262K | 260K |
| Input $/M | $0.95 | $0.04 |
| Output $/M | $4 | $0.15 |
| Weights | Open | Proprietary |

## Coding

- Kimi K2.6: 50.5 (#41)
- Mercury 2.5: —

| Benchmark | Kimi K2.6 | Mercury 2.5 |
|---|---|---|
| ALE-Bench | 1,093 | 301.65 |
| SWE-bench Verified | 76.7% | — |
| LMArena WebDev | 1509 | — |
| SciCode | 53.5% | — |
| WeirdML | 55.9% | — |
| LMArena Coding | 1488 | — |

## Agentic & Tool Use

- Kimi K2.6: 21.8 (#128)
- Mercury 2.5: —

| Benchmark | Kimi K2.6 | Mercury 2.5 |
|---|---|---|
| OSWorld 2.0 | 4.6% | — |
| ExploitBench | 18.4% | — |
| GBAEval | 0.9% | — |
| GDP.pdf | 12% | — |
| Vending-Bench 2 | 6,205 | — |

## Reasoning

- Kimi K2.6: 39.6 (#51)
- Mercury 2.5: —

| Benchmark | Kimi K2.6 | Mercury 2.5 |
|---|---|---|
| NYT Connections (extended) | 87.2% | — |
| CritPt | 8% | — |
| Chess Puzzles | 26% | — |
| EBR-Bench | 2.4% | — |
| LMArena Hard Prompts | 1470 | — |
| Mystery Game Puzzles | 18% | — |
| DTBench | 90.9% | — |
| LMCA | 37.3% | — |
| Epoch Capabilities Index | 151.03 | — |

## Math

- Kimi K2.6: 56.8 (#34)
- Mercury 2.5: 22.4

| Benchmark | Kimi K2.6 | Mercury 2.5 |
|---|---|---|
| ProofBench | 16% | 3% |
| FrontierMath (Tiers 1-3) | 57.2% | — |
| FrontierMath Tier 4 | 25.6% | — |
| MathArena Final-Answer Competitions | 72.9% | — |
| OTIS Mock AIME 2024-2025 | 96.1% | — |
| LMArena Math | 1475 | — |
| FrontierMath (Feb 2025 set) | 39% | — |
| FrontierMath Tier 4 (v1) | 14.6% | — |

## Knowledge

- Kimi K2.6: 53.9 (#48)
- Mercury 2.5: —

| Benchmark | Kimi K2.6 | Mercury 2.5 |
|---|---|---|
| GPQA Diamond | 90.8% | — |
| SimpleQA Verified | 34.9% | — |
| Vectara Hallucination Rate | 10.8% | — |
| LMArena Expert | 1491 | — |

## Multimodal

- Kimi K2.6: 31.8 (#95)
- Mercury 2.5: —

| Benchmark | Kimi K2.6 | Mercury 2.5 |
|---|---|---|
| LMArena Vision | 1282 | — |
| Blueprint-Bench 2 | 3.9% | — |
| Furniture Assembly | 21.7% | — |
| LMArena Document | 1451 | — |

## Multilingual

- Kimi K2.6: 55.1 (#35)
- Mercury 2.5: —

| Benchmark | Kimi K2.6 | Mercury 2.5 |
|---|---|---|
| LMArena Non-English | 1446 | — |
| LMArena Chinese | 1521 | — |
| LMArena French | 1471 | — |
| LMArena German | 1449 | — |
| LMArena Japanese | 1442 | — |
| LMArena Korean | 1428 | — |
| LMArena Russian | 1446 | — |
| LMArena Spanish | 1463 | — |

## Instruction Following

- Kimi K2.6: 76.5 (#40)
- Mercury 2.5: —

| Benchmark | Kimi K2.6 | Mercury 2.5 |
|---|---|---|
| LMArena Instruction Following | 1451 | — |

## Long Context

- Kimi K2.6: 44.9 (#50)
- Mercury 2.5: —

| Benchmark | Kimi K2.6 | Mercury 2.5 |
|---|---|---|
| LMArena Longer Query | 1468 | — |

## Writing & Preference

- Kimi K2.6: 68.7 (#25)
- Mercury 2.5: —

| Benchmark | Kimi K2.6 | Mercury 2.5 |
|---|---|---|
| LMArena Text | 1455 | — |
| LMArena Creative Writing | 1434 | — |
| EQ-Bench Creative Writing | 1725 | — |
| EQ-Bench 4 | 1202 | — |
| LMArena Multi-Turn | 1453 | — |

## FAQ

### Is Kimi K2.6 better than Mercury 2.5?

Kimi K2.6 has enough public results to be ranked (#52); Mercury 2.5 does not yet, so treat this comparison as directional.

### Which is cheaper, Kimi K2.6 or Mercury 2.5?

Mercury 2.5 is cheaper. It lists at $0.04 per million input tokens and $0.15 per million output tokens; Kimi K2.6 lists at $0.95 and $4.

### Which has the bigger context window?

Kimi K2.6 does, with 262K tokens against 260K.

### How many benchmarks do Kimi K2.6 and Mercury 2.5 share?

2 benchmarks have published results for both models. Kimi K2.6 has 51 scored results on Noometry and Mercury 2.5 has 2.