# Gemini 2.5 Flash vs Kimi K2.5 Instant

> Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 39.3 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gemini-2-5-flash-vs-kimi-k2-5-instant
- Last updated: 2026-10-12
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Gemini 2.5 Flash scores higher in 5 categories and Kimi K2.5 Instant in 4 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Kimi K2.5 Instant leads 29.7 to 18.1.
- Kimi K2.5 Instant has downloadable open weights; the other is API-only.

## Snapshot

| | Gemini 2.5 Flash | Kimi K2.5 Instant |
|---|---|---|
| Provider | Google | Moonshot AI |
| Noometry Index | 39.3 | 43.6 |
| Rank | 170 | 89 |
| Context | 1.05M | — |
| Input $/M | $0.30 | — |
| Output $/M | $2.50 | — |
| Weights | Proprietary | Open |

## Coding

- Gemini 2.5 Flash: 35.8 (#220)
- Kimi K2.5 Instant: 42.6 (#97)

| Benchmark | Gemini 2.5 Flash | Kimi K2.5 Instant |
|---|---|---|
| LMArena Coding | 1424 | 1484 |
| SWE-bench Verified (bash only) | 28.7% | — |
| Aider Polyglot | 55.1% | — |
| LMArena WebDev | — | 1404 |
| WeirdML | 41.9% | — |
| ALE-Bench | 661.88 | — |

## Agentic & Tool Use

- Gemini 2.5 Flash: 30.8 (#74)
- Kimi K2.5 Instant: —

| Benchmark | Gemini 2.5 Flash | Kimi K2.5 Instant |
|---|---|---|
| Terminal-Bench | 17.1% | — |
| Berkeley Function Calling Leaderboard | 56.2% | — |
| TheAgentCompany | 41.1% | — |
| BALROG | 33.5% | — |
| Vending-Bench 2 | 548.84 | — |

## Reasoning

- Gemini 2.5 Flash: 18.1 (#286)
- Kimi K2.5 Instant: 29.7 (#90)

| Benchmark | Gemini 2.5 Flash | Kimi K2.5 Instant |
|---|---|---|
| LMArena Hard Prompts | 1422 | 1443 |
| ARC-AGI-2 | 2.5% | — |
| SimpleBench | 41.2% | — |
| Kagi LLM Benchmark | 56.8% | — |
| ARC-AGI-1 | 33.3% | — |
| CritPt | 1.1% | — |
| EnigmaEval | 2.7% | — |
| DTBench | 76.5% | — |
| LMCA | 27.5% | — |
| Epoch Capabilities Index | 143.03 | — |
| ForecastBench | 60.6 | — |

## Math

- Gemini 2.5 Flash: 39.9 (#98)
- Kimi K2.5 Instant: 39.4 (#105)

| Benchmark | Gemini 2.5 Flash | Kimi K2.5 Instant |
|---|---|---|
| LMArena Math | 1415 | 1442 |
| OTIS Mock AIME 2024-2025 | 73.1% | — |
| Omni-MATH | 38.5% | — |
| FrontierMath (Feb 2025 set) | 4.8% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |

## Knowledge

- Gemini 2.5 Flash: 36.4 (#168)
- Kimi K2.5 Instant: 40.2 (#123)

| Benchmark | Gemini 2.5 Flash | Kimi K2.5 Instant |
|---|---|---|
| LMArena Expert | 1426 | 1440 |
| Humanity's Last Exam | 12.1% | — |
| MMLU-Pro | 63.9% | — |
| Confabulations | 16.8% | — |
| Vectara Hallucination Rate | 7.8% | — |
| GPQA (HELM) | 39% | — |

## Multimodal

- Gemini 2.5 Flash: 41.8 (#32)
- Kimi K2.5 Instant: 40.2 (#50)

| Benchmark | Gemini 2.5 Flash | Kimi K2.5 Instant |
|---|---|---|
| LMArena Vision | 1253 | 1254 |
| GeoBench | 76% | — |
| VPCT | 46.2% | — |
| SpatialViz-Bench | 36.9% | — |

## Multilingual

- Gemini 2.5 Flash: 52.3 (#88)
- Kimi K2.5 Instant: 52.0 (#94)

| Benchmark | Gemini 2.5 Flash | Kimi K2.5 Instant |
|---|---|---|
| LMArena Non-English | 1409 | 1406 |
| LMArena Chinese | 1450 | 1449 |
| LMArena French | 1433 | 1403 |
| LMArena German | 1418 | 1413 |
| LMArena Korean | 1385 | 1378 |
| LMArena Russian | 1415 | 1404 |
| LMArena Spanish | 1421 | 1447 |
| LMArena Japanese | 1405 | — |

## Instruction Following

- Gemini 2.5 Flash: 75.7 (#54)
- Kimi K2.5 Instant: 75.3 (#65)

| Benchmark | Gemini 2.5 Flash | Kimi K2.5 Instant |
|---|---|---|
| LMArena Instruction Following | 1405 | 1430 |
| IFEval | 89.8% | — |

## Long Context

- Gemini 2.5 Flash: 47.5 (#17)
- Kimi K2.5 Instant: 43.9 (#83)

| Benchmark | Gemini 2.5 Flash | Kimi K2.5 Instant |
|---|---|---|
| LMArena Longer Query | 1419 | 1435 |
| Fiction.LiveBench | 77.8% | — |

## Writing & Preference

- Gemini 2.5 Flash: 53.8 (#157)
- Kimi K2.5 Instant: 60.6 (#95)

| Benchmark | Gemini 2.5 Flash | Kimi K2.5 Instant |
|---|---|---|
| LMArena Text | 1417 | 1420 |
| LMArena Creative Writing | 1400 | 1381 |
| LMArena Multi-Turn | 1408 | 1427 |
| Short-Story Creative Writing | 76.5% | — |
| EQ-Bench Creative Writing | 1137 | — |
| WildBench | 81.7% | — |

## FAQ

### Is Gemini 2.5 Flash better than Kimi K2.5 Instant?

Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 39.3 on the Noometry Index.

### Is Gemini 2.5 Flash or Kimi K2.5 Instant better for coding?

Kimi K2.5 Instant scores higher on coding benchmarks: 42.6 versus 35.8 in the Noometry coding category.

### How many benchmarks do Gemini 2.5 Flash and Kimi K2.5 Instant share?

17 benchmarks have published results for both models. Gemini 2.5 Flash has 54 scored results on Noometry and Kimi K2.5 Instant has 18.