Model comparison

Devstral Small 2505 vs Mistral Small 3

Devstral Small 2505 is the stronger model overall, scoring 34.3 to 31.2 on the Noometry Index. Mistral Small 3 costs 2.6× less per token, which makes it the better buy when Devstral Small 2505's lead doesn't matter for your workload.

Last verified October 11, 2026. 0 shared benchmarks.

Devstral Small 2505

Mistral AI

34.3

Rank #233 Reported

Mistral Small 3

Mistral AI

31.2

Rank #278 Confirmed

Summary

Mistral Small 3 is cheaper at $0.05 / $0.08 per million input/output tokens, against $0.10 / $0.30 for Devstral Small 2505.
Devstral Small 2505 accepts more context: 128K tokens versus 33K.

Side by side

Devstral Small 2505 and Mistral Small 3 specifications
	Devstral Small 2505	Mistral Small 3
Provider	Mistral AI	Mistral AI
Noometry Index	34.3	31.2
Released	2025-05-07	2025-01-30
Weights	Open	Open
Context window	128K	33K
Max output	128K	16K
Input $ / M tokens	$0.10	$0.05
Output $ / M tokens	$0.30	$0.08
Results tracked	4	24

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Category by category

Coding Devstral Small 2505 leads

Devstral Small 2505: 38.9 (#166), Mistral Small 3: 36.5 (#207)

Coding benchmarks
Benchmark	Devstral Small 2505	Mistral Small 3
SWE-bench Verified (bash only)	56.4%	—
SciCode	28.8%	—
BigCodeBench Instruct	—	45.3%
LMArena Coding	—	1246
BigCodeBench Complete	—	50.4%

Reasoning Too close to call

Devstral Small 2505: 19.7 (#252), Mistral Small 3: 18.9 (#273)

Reasoning benchmarks
Benchmark	Devstral Small 2505	Mistral Small 3
Kagi LLM Benchmark	37.7%	—
CritPt	0%	—
Chess Puzzles	—	0%
LMArena Hard Prompts	—	1233
Epoch Capabilities Index	—	127.07

Math Not comparable

Devstral Small 2505: —, Mistral Small 3: 16.3 (#295)

Math benchmarks
Benchmark	Devstral Small 2505	Mistral Small 3
OTIS Mock AIME 2024-2025	—	6.7%
LMArena Math	—	1240

Knowledge Not comparable

Devstral Small 2505: —, Mistral Small 3: 25.1 (#263)

Knowledge benchmarks
Benchmark	Devstral Small 2505	Mistral Small 3
GPQA Diamond	—	47.3%
Confabulations	—	25.2%
LMArena Expert	—	1202

Multilingual Not comparable

Devstral Small 2505: —, Mistral Small 3: 37.3 (#236)

Multilingual benchmarks
Benchmark	Devstral Small 2505	Mistral Small 3
LMArena Non-English	—	1198
LMArena Chinese	—	1204
LMArena French	—	1203
LMArena German	—	1211
LMArena Japanese	—	1111
LMArena Korean	—	1188
LMArena Russian	—	1216

Instruction Following Not comparable

Devstral Small 2505: —, Mistral Small 3: 63.7 (#229)

Instruction Following benchmarks
Benchmark	Devstral Small 2505	Mistral Small 3
LMArena Instruction Following	—	1214

Long Context Not comparable

Devstral Small 2505: —, Mistral Small 3: 37.8 (#211)

Long Context benchmarks
Benchmark	Devstral Small 2505	Mistral Small 3
LMArena Longer Query	—	1246

Writing & Preference Not comparable

Devstral Small 2505: —, Mistral Small 3: 32.2 (#280)

Writing & Preference benchmarks
Benchmark	Devstral Small 2505	Mistral Small 3
LMArena Text	—	1234
LMArena Creative Writing	—	1195
EQ-Bench Creative Writing	—	707
LMArena Multi-Turn	—	1217

Frequently asked questions

Is Devstral Small 2505 better than Mistral Small 3?

Which is cheaper, Devstral Small 2505 or Mistral Small 3?

Mistral Small 3 is cheaper. It lists at $0.05 per million input tokens and $0.08 per million output tokens; Devstral Small 2505 lists at $0.10 and $0.30.

Is Devstral Small 2505 or Mistral Small 3 better for coding?

Devstral Small 2505 scores higher on coding benchmarks: 38.9 versus 36.5 in the Noometry coding category.

Which has the bigger context window?

Devstral Small 2505 does, with 128K tokens against 33K.

How many benchmarks do Devstral Small 2505 and Mistral Small 3 share?

0 benchmarks have published results for both models. Devstral Small 2505 has 4 scored results on Noometry and Mistral Small 3 has 24.