Noometry

Model comparison

Gemini 2.5 Pro vs Mistral Small 3.1

Gemini 2.5 Pro is the stronger model overall, scoring 44.9 to 31.4 on the Noometry Index. Mistral Small 3.1 costs 8.6× less per token, which makes it the better buy when Gemini 2.5 Pro's lead doesn't matter for your workload.

Last verified . 28 shared benchmarks.

Gemini 2.5 Pro Google

44.9

Rank #67 Confirmed

Mistral Small 3.1 Mistral AI

31.4

Rank #263 Confirmed

Summary

  • They share 28 benchmarks with published results for both. Gemini 2.5 Pro scores higher in 9 categories and Mistral Small 3.1 in 0 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in knowledge, where Gemini 2.5 Pro leads 55.8 to 22.6.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 84.7% for Gemini 2.5 Pro and 3.9% for Mistral Small 3.1.
  • Mistral Small 3.1 is cheaper at $0.35 / $0.56 per million input/output tokens, against $1.25 / $10 for Gemini 2.5 Pro.
  • Gemini 2.5 Pro accepts more context: 1.05M tokens versus 128K.
  • Mistral Small 3.1 has downloadable open weights; the other is API-only.

Side by side

Gemini 2.5 ProMistral Small 3.1
ProviderGoogleMistral AI
Noometry Index44.931.4
Released2025-03-252025-03-17
WeightsProprietaryOpen
Context window1.05M128K
Max output66K102K
Input $ / M tokens$1.25$0.35
Output $ / M tokens$10$0.56
Results tracked7828

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Category by category

Coding Gemini 2.5 Pro leads

Gemini 2.5 Pro: 42.8 (#86), Mistral Small 3.1: 37.7 (#175)

BenchmarkGemini 2.5 ProMistral Small 3.1
LMArena Coding14521309
SWE-bench Verified57.6%—
SWE-bench Verified (bash only)53.6%—
Aider Polyglot83.1%—
LMArena WebDev1227—
SciCode42.8%—
GSO3.9%—
WeirdML54%—
LiveBench Coding85.9%—
CadEval64%—
ALE-Bench785.52—
AlgoTune1.51—

Agentic & Tool Use Not comparable

Gemini 2.5 Pro: 29.1 (#81), Mistral Small 3.1: —

BenchmarkGemini 2.5 ProMistral Small 3.1
Terminal-Bench32.6%—
GDPval23.3%—
Remote Labor Index0.8%—
TheAgentCompany30.3%—
τ²-bench Banking13.7%—
DeepResearch Bench42.8%—
BALROG43.3%—
LMArena Search1142—
METR Time Horizons55.4%—
Vending-Bench 2573.64—

Reasoning Gemini 2.5 Pro leads

Gemini 2.5 Pro: 28.8 (#85), Mistral Small 3.1: 18.9 (#249)

BenchmarkGemini 2.5 ProMistral Small 3.1
Chess Puzzles20%1%
LMArena Hard Prompts14551278
Epoch Capabilities Index145.32127.48
ARC-AGI-24.9%—
SimpleBench62.4%—
Kagi LLM Benchmark70.3%—
ARC-AGI-141%—
CritPt2%—
EnigmaEval5.6%—
LiveBench Reasoning89.8%—
DTBench82.4%—
LiveBench Data Analysis79.9%—
LMCA34.8%—
ForecastBench61.3—
LiveBench82.3%—

Math Gemini 2.5 Pro leads

Gemini 2.5 Pro: 31.9 (#191), Mistral Small 3.1: 13.7 (#295)

BenchmarkGemini 2.5 ProMistral Small 3.1
OTIS Mock AIME 2024-202584.7%3.9%
Omni-MATH41.6%24.8%
LMArena Math14501261
FrontierMath (Tiers 1-3)24.6%—
FrontierMath Tier 40%—
LiveBench Math90.2%—
MATH Level 595.9%—
FrontierMath (Feb 2025 set)14.1%—
FrontierMath Tier 4 (v1)4.2%—

Knowledge Gemini 2.5 Pro leads

Gemini 2.5 Pro: 55.8 (#41), Mistral Small 3.1: 22.6 (#266)

BenchmarkGemini 2.5 ProMistral Small 3.1
GPQA Diamond85.3%41.9%
MMLU-Pro86.3%61%
GPQA (HELM)74.9%39.2%
LMArena Expert14521258
Humanity's Last Exam21.6%—
Confabulations10.6%—
Vectara Hallucination Rate7%—

Multimodal Gemini 2.5 Pro leads

Gemini 2.5 Pro: 44.5 (#16), Mistral Small 3.1: 32.6 (#93)

BenchmarkGemini 2.5 ProMistral Small 3.1
LMArena Vision12631136
GeoBench86%—
VPCT48%—
LMArena Document1421—
SpatialViz-Bench44.7%—

Multilingual Gemini 2.5 Pro leads

Gemini 2.5 Pro: 55.5 (#30), Mistral Small 3.1: 41.4 (#204)

BenchmarkGemini 2.5 ProMistral Small 3.1
LMArena Non-English14521255
LMArena Chinese15071254
LMArena French14731270
LMArena German14871266
LMArena Japanese14621210
LMArena Korean14351206
LMArena Russian14601263
LMArena Spanish14731283

Instruction Following Gemini 2.5 Pro leads

Gemini 2.5 Pro: 75.2 (#71), Mistral Small 3.1: 63.8 (#225)

BenchmarkGemini 2.5 ProMistral Small 3.1
IFEval84%75%
LMArena Instruction Following14361264
LiveBench Instruction Following80.6%—

Long Context Gemini 2.5 Pro leads

Gemini 2.5 Pro: 59.7 (#5), Mistral Small 3.1: 39.5 (#172)

BenchmarkGemini 2.5 ProMistral Small 3.1
LMArena Longer Query14491300
Fiction.LiveBench91.7%—

Writing & Preference Gemini 2.5 Pro leads

Gemini 2.5 Pro: 63.9 (#60), Mistral Small 3.1: 37.2 (#254)

BenchmarkGemini 2.5 ProMistral Small 3.1
LMArena Text14581278
LMArena Creative Writing14531253
EQ-Bench Creative Writing1421761
WildBench85.7%78.8%
LMArena Multi-Turn14531270
Short-Story Creative Writing83.8%—
LiveBench Language67.8%—

Frequently asked questions

Is Gemini 2.5 Pro better than Mistral Small 3.1?

Gemini 2.5 Pro is the stronger model overall, scoring 44.9 to 31.4 on the Noometry Index. Mistral Small 3.1 costs 8.6× less per token, which makes it the better buy when Gemini 2.5 Pro's lead doesn't matter for your workload.

Which is cheaper, Gemini 2.5 Pro or Mistral Small 3.1?

Mistral Small 3.1 is cheaper. It lists at $0.35 per million input tokens and $0.56 per million output tokens; Gemini 2.5 Pro lists at $1.25 and $10.

Is Gemini 2.5 Pro or Mistral Small 3.1 better for coding?

Gemini 2.5 Pro scores higher on coding benchmarks: 42.8 versus 37.7 in the Noometry coding category.

Which has the bigger context window?

Gemini 2.5 Pro does, with 1.05M tokens against 128K.

How many benchmarks do Gemini 2.5 Pro and Mistral Small 3.1 share?

28 benchmarks have published results for both models. Gemini 2.5 Pro has 78 scored results on Noometry and Mistral Small 3.1 has 28.

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