# Gemini 3.5 Flash vs Kimi K3

> Kimi K3 is the stronger model overall, scoring 59.5 to 54.2 on the Noometry Index. Gemini 3.5 Flash costs 1.8× less per token, which makes it the better buy when Kimi K3's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gemini-3-5-flash-vs-kimi-k3
- Last updated: 2026-10-10
- Shared benchmarks: 47

## Summary

- They share 47 benchmarks with published results for both. Gemini 3.5 Flash scores higher in 3 categories and Kimi K3 in 7 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in agentic & tool use, where Kimi K3 leads 41.8 to 24.7.
- The biggest single-benchmark swing is ProofBench: 31% for Gemini 3.5 Flash and 87% for Kimi K3.
- Gemini 3.5 Flash is cheaper at $1.50 / $9 per million input/output tokens, against $3 / $15 for Kimi K3.
- Kimi K3 has downloadable open weights; the other is API-only.

## Snapshot

| | Gemini 3.5 Flash | Kimi K3 |
|---|---|---|
| Provider | Google | Moonshot AI |
| Noometry Index | 54.2 | 59.5 |
| Rank | 32 | 15 |
| Context | 1.05M | 1.05M |
| Input $/M | $1.50 | $3 |
| Output $/M | $9 | $15 |
| Weights | Proprietary | Open |

## Coding

- Gemini 3.5 Flash: 49.4 (#49)
- Kimi K3: 61.0 (#10)

| Benchmark | Gemini 3.5 Flash | Kimi K3 |
|---|---|---|
| DeepSWE | 37.4% | 68.5% |
| LMArena WebDev | 1499 | 1654 |
| SciCode | 53.1% | 59.5% |
| WeirdML | 62.6% | 82.6% |
| LMArena Coding | 1492 | 1508 |
| ALE-Bench | 911.02 | 1,524 |
| SWE-bench Verified | 79.3% | — |
| FrontierCode | — | 44.2% |
| FrontierSWE | — | 25.9% |

## Agentic & Tool Use

- Gemini 3.5 Flash: 24.7 (#114)
- Kimi K3: 41.8 (#20)

| Benchmark | Gemini 3.5 Flash | Kimi K3 |
|---|---|---|
| APEX-Agents | 27.5% | 50.6% |
| GBAEval | 6.7% | 48.3% |
| GDP.pdf | 14% | 19% |
| Vending-Bench 2 | 5,396 | 5,165 |
| τ²-bench Banking | — | 37.1% |
| PostTrainBench | — | 32% |

## Reasoning

- Gemini 3.5 Flash: 62.8 (#18)
- Kimi K3: 63.0 (#17)

| Benchmark | Gemini 3.5 Flash | Kimi K3 |
|---|---|---|
| ARC-AGI-2 | 72.1% | 60.4% |
| SimpleBench | 76.7% | 60.7% |
| NYT Connections (extended) | 92.6% | 93.6% |
| ARC-AGI-1 | 92.5% | 94.5% |
| CritPt | 13.1% | 23.4% |
| Chess Puzzles | 50% | 39% |
| LMArena Hard Prompts | 1488 | 1496 |
| Mystery Game Puzzles | 32% | 26% |
| DTBench | 94.7% | 91.2% |
| LMCA | 47.1% | 52.7% |
| Surface Evolver Bench | 58.1% | 95% |
| Epoch Capabilities Index | 154.46 | 157.45 |
| ForecastBench | 59 | 61.1 |
| EnigmaEval | 25.4% | — |
| EBR-Bench | 4.8% | — |

## Math

- Gemini 3.5 Flash: 60.7 (#36)
- Kimi K3: 74.2 (#16)

| Benchmark | Gemini 3.5 Flash | Kimi K3 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 62.8% | 72.2% |
| FrontierMath Tier 4 | 26.8% | 39% |
| MathArena Final-Answer Competitions | 76.3% | 87.8% |
| OTIS Mock AIME 2024-2025 | 95.6% | 97.2% |
| ProofBench | 31% | 87% |
| LMArena Math | 1504 | 1491 |
| FrontierMath (Feb 2025 set) | 39% | — |
| FrontierMath Tier 4 (v1) | 14.6% | — |

## Knowledge

- Gemini 3.5 Flash: 66.3 (#11)
- Kimi K3: 63.2 (#21)

| Benchmark | Gemini 3.5 Flash | Kimi K3 |
|---|---|---|
| GPQA Diamond | 92.8% | 93.1% |
| SimpleQA Verified | 66.2% | 50.6% |
| LMArena Expert | 1495 | 1521 |

## Multimodal

- Gemini 3.5 Flash: 45.7 (#15)
- Kimi K3: 37.8 (#70)

| Benchmark | Gemini 3.5 Flash | Kimi K3 |
|---|---|---|
| Blueprint-Bench 2 | 33.6% | 29.5% |
| LMArena Vision | 1310 | — |
| Furniture Assembly | — | 34.2% |
| LMArena Document | 1463 | — |

## Multilingual

- Gemini 3.5 Flash: 57.0 (#13)
- Kimi K3: 56.3 (#21)

| Benchmark | Gemini 3.5 Flash | Kimi K3 |
|---|---|---|
| LMArena Non-English | 1476 | 1466 |
| LMArena Chinese | 1526 | 1529 |
| LMArena French | 1490 | 1491 |
| LMArena German | 1492 | 1488 |
| LMArena Japanese | 1486 | 1487 |
| LMArena Korean | 1451 | 1458 |
| LMArena Russian | 1493 | 1482 |
| LMArena Spanish | 1480 | 1472 |

## Instruction Following

- Gemini 3.5 Flash: 77.0 (#30)
- Kimi K3: 77.7 (#14)

| Benchmark | Gemini 3.5 Flash | Kimi K3 |
|---|---|---|
| LMArena Instruction Following | 1467 | 1483 |

## Long Context

- Gemini 3.5 Flash: 45.4 (#38)
- Kimi K3: 45.8 (#29)

| Benchmark | Gemini 3.5 Flash | Kimi K3 |
|---|---|---|
| LMArena Longer Query | 1482 | 1494 |

## Writing & Preference

- Gemini 3.5 Flash: 65.5 (#47)
- Kimi K3: 76.6 (#4)

| Benchmark | Gemini 3.5 Flash | Kimi K3 |
|---|---|---|
| LMArena Text | 1482 | 1476 |
| LMArena Creative Writing | 1470 | 1454 |
| EQ-Bench 4 | 1087 | 1339 |
| LMArena Multi-Turn | 1481 | 1488 |
| EQ-Bench Creative Writing | — | 2082 |

## FAQ

### Is Gemini 3.5 Flash better than Kimi K3?

Kimi K3 is the stronger model overall, scoring 59.5 to 54.2 on the Noometry Index. Gemini 3.5 Flash costs 1.8× less per token, which makes it the better buy when Kimi K3's lead doesn't matter for your workload.

### Which is cheaper, Gemini 3.5 Flash or Kimi K3?

Gemini 3.5 Flash is cheaper. It lists at $1.50 per million input tokens and $9 per million output tokens; Kimi K3 lists at $3 and $15.

### Is Gemini 3.5 Flash or Kimi K3 better for coding?

Kimi K3 scores higher on coding benchmarks: 61.0 versus 49.4 in the Noometry coding category.

### Which has the bigger context window?

Both accept 1.05M tokens.

### How many benchmarks do Gemini 3.5 Flash and Kimi K3 share?

47 benchmarks have published results for both models. Gemini 3.5 Flash has 54 scored results on Noometry and Kimi K3 has 53.