# Devstral Small 2505 vs Kimi K3

> Kimi K3 is the stronger model overall, scoring 59.5 to 34.3 on the Noometry Index. Devstral Small 2505 costs 40× 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/devstral-small-vs-kimi-k3
- Last updated: 2026-10-10
- Shared benchmarks: 2

## Summary

- They share 2 benchmarks with published results for both. Devstral Small 2505 scores higher in 0 categories and Kimi K3 in 2 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Kimi K3 leads 63.0 to 19.7.
- The biggest single-benchmark swing is SciCode: 28.8% for Devstral Small 2505 and 59.5% for Kimi K3.
- Devstral Small 2505 is cheaper at $0.10 / $0.30 per million input/output tokens, against $3 / $15 for Kimi K3.
- Kimi K3 accepts more context: 1.05M tokens versus 128K.

## Snapshot

| | Devstral Small 2505 | Kimi K3 |
|---|---|---|
| Provider | Mistral AI | Moonshot AI |
| Noometry Index | 34.3 | 59.5 |
| Rank | 233 | 15 |
| Context | 128K | 1.05M |
| Input $/M | $0.10 | $3 |
| Output $/M | $0.30 | $15 |
| Weights | Open | Open |

## Coding

- Devstral Small 2505: 38.9 (#166)
- Kimi K3: 61.0 (#10)

| Benchmark | Devstral Small 2505 | Kimi K3 |
|---|---|---|
| SciCode | 28.8% | 59.5% |
| DeepSWE | — | 68.5% |
| FrontierCode | — | 44.2% |
| SWE-bench Verified (bash only) | 56.4% | — |
| LMArena WebDev | — | 1654 |
| FrontierSWE | — | 25.9% |
| WeirdML | — | 82.6% |
| LMArena Coding | — | 1508 |
| ALE-Bench | — | 1,524 |

## Agentic & Tool Use

- Devstral Small 2505: —
- Kimi K3: 41.8 (#20)

| Benchmark | Devstral Small 2505 | Kimi K3 |
|---|---|---|
| APEX-Agents | — | 50.6% |
| τ²-bench Banking | — | 37.1% |
| PostTrainBench | — | 32% |
| GBAEval | — | 48.3% |
| GDP.pdf | — | 19% |
| Vending-Bench 2 | — | 5,165 |

## Reasoning

- Devstral Small 2505: 19.7 (#252)
- Kimi K3: 63.0 (#17)

| Benchmark | Devstral Small 2505 | Kimi K3 |
|---|---|---|
| CritPt | 0% | 23.4% |
| ARC-AGI-2 | — | 60.4% |
| SimpleBench | — | 60.7% |
| Kagi LLM Benchmark | 37.7% | — |
| NYT Connections (extended) | — | 93.6% |
| ARC-AGI-1 | — | 94.5% |
| Chess Puzzles | — | 39% |
| LMArena Hard Prompts | — | 1496 |
| Mystery Game Puzzles | — | 26% |
| DTBench | — | 91.2% |
| LMCA | — | 52.7% |
| Surface Evolver Bench | — | 95% |
| Epoch Capabilities Index | — | 157.45 |
| ForecastBench | — | 61.1 |

## Math

- Devstral Small 2505: —
- Kimi K3: 74.2 (#16)

| Benchmark | Devstral Small 2505 | Kimi K3 |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 72.2% |
| FrontierMath Tier 4 | — | 39% |
| MathArena Final-Answer Competitions | — | 87.8% |
| OTIS Mock AIME 2024-2025 | — | 97.2% |
| ProofBench | — | 87% |
| LMArena Math | — | 1491 |

## Knowledge

- Devstral Small 2505: —
- Kimi K3: 63.2 (#21)

| Benchmark | Devstral Small 2505 | Kimi K3 |
|---|---|---|
| GPQA Diamond | — | 93.1% |
| SimpleQA Verified | — | 50.6% |
| LMArena Expert | — | 1521 |

## Multimodal

- Devstral Small 2505: —
- Kimi K3: 37.8 (#70)

| Benchmark | Devstral Small 2505 | Kimi K3 |
|---|---|---|
| Blueprint-Bench 2 | — | 29.5% |
| Furniture Assembly | — | 34.2% |

## Multilingual

- Devstral Small 2505: —
- Kimi K3: 56.3 (#21)

| Benchmark | Devstral Small 2505 | Kimi K3 |
|---|---|---|
| LMArena Non-English | — | 1466 |
| LMArena Chinese | — | 1529 |
| LMArena French | — | 1491 |
| LMArena German | — | 1488 |
| LMArena Japanese | — | 1487 |
| LMArena Korean | — | 1458 |
| LMArena Russian | — | 1482 |
| LMArena Spanish | — | 1472 |

## Instruction Following

- Devstral Small 2505: —
- Kimi K3: 77.7 (#14)

| Benchmark | Devstral Small 2505 | Kimi K3 |
|---|---|---|
| LMArena Instruction Following | — | 1483 |

## Long Context

- Devstral Small 2505: —
- Kimi K3: 45.8 (#29)

| Benchmark | Devstral Small 2505 | Kimi K3 |
|---|---|---|
| LMArena Longer Query | — | 1494 |

## Writing & Preference

- Devstral Small 2505: —
- Kimi K3: 76.6 (#4)

| Benchmark | Devstral Small 2505 | Kimi K3 |
|---|---|---|
| LMArena Text | — | 1476 |
| LMArena Creative Writing | — | 1454 |
| EQ-Bench Creative Writing | — | 2082 |
| EQ-Bench 4 | — | 1339 |
| LMArena Multi-Turn | — | 1488 |

## FAQ

### Is Devstral Small 2505 better than Kimi K3?

Kimi K3 is the stronger model overall, scoring 59.5 to 34.3 on the Noometry Index. Devstral Small 2505 costs 40× less per token, which makes it the better buy when Kimi K3's lead doesn't matter for your workload.

### Which is cheaper, Devstral Small 2505 or Kimi K3?

Devstral Small 2505 is cheaper. It lists at $0.10 per million input tokens and $0.30 per million output tokens; Kimi K3 lists at $3 and $15.

### Is Devstral Small 2505 or Kimi K3 better for coding?

Kimi K3 scores higher on coding benchmarks: 61.0 versus 38.9 in the Noometry coding category.

### Which has the bigger context window?

Kimi K3 does, with 1.05M tokens against 128K.

### How many benchmarks do Devstral Small 2505 and Kimi K3 share?

2 benchmarks have published results for both models. Devstral Small 2505 has 4 scored results on Noometry and Kimi K3 has 53.