# Devstral Small 2505 vs Mercury 2.5

> Devstral Small 2505 has enough public results to be ranked (#228); Mercury 2.5 does not yet, so treat this comparison as directional.

- Canonical page: https://noometry.com/compare/devstral-small-vs-mercury-2-5
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- Mercury 2.5 is cheaper at $0.04 / $0.15 per million input/output tokens, against $0.10 / $0.30 for Devstral Small 2505.
- Mercury 2.5 accepts more context: 260K tokens versus 128K.
- Devstral Small 2505 has downloadable open weights; the other is API-only.

## Snapshot

| | Devstral Small 2505 | Mercury 2.5 |
|---|---|---|
| Provider | Mistral AI | Inception |
| Noometry Index | 33.9 | 30.2 |
| Rank | 228 | — |
| Context | 128K | 260K |
| Input $/M | $0.10 | $0.04 |
| Output $/M | $0.30 | $0.15 |
| Weights | Open | Proprietary |

## Coding

- Devstral Small 2505: 38.6 (#160)
- Mercury 2.5: —

| Benchmark | Devstral Small 2505 | Mercury 2.5 |
|---|---|---|
| SWE-bench Verified (bash only) | 56.4% | — |
| SciCode | 28.8% | — |
| ALE-Bench | — | 301.65 |

## Reasoning

- Devstral Small 2505: 19.1 (#243)
- Mercury 2.5: —

| Benchmark | Devstral Small 2505 | Mercury 2.5 |
|---|---|---|
| Kagi LLM Benchmark | 37.7% | — |
| CritPt | 0% | — |

## Math

- Devstral Small 2505: —
- Mercury 2.5: 22.4

| Benchmark | Devstral Small 2505 | Mercury 2.5 |
|---|---|---|
| ProofBench | — | 3% |

## FAQ

### Is Devstral Small 2505 better than Mercury 2.5?

Devstral Small 2505 has enough public results to be ranked (#228); Mercury 2.5 does not yet, so treat this comparison as directional.

### Which is cheaper, Devstral Small 2505 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; Devstral Small 2505 lists at $0.10 and $0.30.

### Which has the bigger context window?

Mercury 2.5 does, with 260K tokens against 128K.

### How many benchmarks do Devstral Small 2505 and Mercury 2.5 share?

0 benchmarks have published results for both models. Devstral Small 2505 has 4 scored results on Noometry and Mercury 2.5 has 2.