Noometry

Model comparison

Grok 4.3 vs Mistral Small 3.1

Grok 4.3 is the stronger model overall, scoring 43.6 to 31.4 on the Noometry Index. Mistral Small 3.1 costs 3.9× less per token, which makes it the better buy when Grok 4.3's lead doesn't matter for your workload.

Last verified . 22 shared benchmarks.

Grok 4.3 xAI

43.6

Rank #80 Confirmed

Mistral Small 3.1 Mistral AI

31.4

Rank #263 Confirmed

Summary

  • They share 22 benchmarks with published results for both. Grok 4.3 scores higher in 8 categories and Mistral Small 3.1 in 1 category; 8 gaps are clear of the uncertainty.
  • The widest gap is in math, where Grok 4.3 leads 45.8 to 13.7.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 93.3% for Grok 4.3 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 / $2.50 for Grok 4.3.
  • Grok 4.3 accepts more context: 1M tokens versus 128K.
  • Mistral Small 3.1 has downloadable open weights; the other is API-only.

Side by side

Grok 4.3Mistral Small 3.1
ProviderxAIMistral AI
Noometry Index43.631.4
Released2026-04-172025-03-17
WeightsProprietaryOpen
Context window1M128K
Max output30K102K
Input $ / M tokens$1.25$0.35
Output $ / M tokens$2.50$0.56
Results tracked4028

Sponsored placements are available on pages like this one. Advertise on Noometry

Category by category

Coding Grok 4.3 leads

Grok 4.3: 41.3 (#117), Mistral Small 3.1: 37.7 (#175)

BenchmarkGrok 4.3Mistral Small 3.1
LMArena Coding14151309
LMArena WebDev1357—
SciCode47.3%—
WeirdML49.9%—
ALE-Bench944.17—

Agentic & Tool Use Not comparable

Grok 4.3: 27.6 (#93), Mistral Small 3.1: —

BenchmarkGrok 4.3Mistral Small 3.1
GDP.pdf8%—
LMArena Search1165—
Vending-Bench 235.26—

Reasoning Grok 4.3 leads

Grok 4.3: 34.9 (#60), Mistral Small 3.1: 18.9 (#249)

BenchmarkGrok 4.3Mistral Small 3.1
Chess Puzzles25%1%
LMArena Hard Prompts13971278
Epoch Capabilities Index149.13127.48
NYT Connections (extended)55.2%—
CritPt8%—
DTBench90.7%—
LMCA38.3%—
ForecastBench60.3—

Math Grok 4.3 leads

Grok 4.3: 45.8 (#60), Mistral Small 3.1: 13.7 (#295)

BenchmarkGrok 4.3Mistral Small 3.1
OTIS Mock AIME 2024-202593.3%3.9%
LMArena Math13881261
FrontierMath (Tiers 1-3)42.8%—
FrontierMath Tier 414.6%—
ProofBench11%—
Omni-MATH—24.8%

Knowledge Grok 4.3 leads

Grok 4.3: 52.5 (#57), Mistral Small 3.1: 22.6 (#266)

BenchmarkGrok 4.3Mistral Small 3.1
GPQA Diamond88.8%41.9%
LMArena Expert13851258
SimpleQA Verified33.2%—
MMLU-Pro—61%
GPQA (HELM)—39.2%

Multimodal Too close to call

Grok 4.3: 31.6 (#96), Mistral Small 3.1: 32.6 (#93)

BenchmarkGrok 4.3Mistral Small 3.1
LMArena Vision12311136
Blueprint-Bench 20%—

Multilingual Grok 4.3 leads

Grok 4.3: 50.7 (#114), Mistral Small 3.1: 41.4 (#204)

BenchmarkGrok 4.3Mistral Small 3.1
LMArena Non-English13851255
LMArena Chinese14231254
LMArena French14121270
LMArena German13951266
LMArena Japanese13791210
LMArena Korean13571206
LMArena Russian13991263
LMArena Spanish14021283

Instruction Following Grok 4.3 leads

Grok 4.3: 72.3 (#135), Mistral Small 3.1: 63.8 (#225)

BenchmarkGrok 4.3Mistral Small 3.1
LMArena Instruction Following13661264
IFEval—75%

Long Context Grok 4.3 leads

Grok 4.3: 42.5 (#118), Mistral Small 3.1: 39.5 (#172)

BenchmarkGrok 4.3Mistral Small 3.1
LMArena Longer Query13931300

Writing & Preference Grok 4.3 leads

Grok 4.3: 58.6 (#112), Mistral Small 3.1: 37.2 (#254)

BenchmarkGrok 4.3Mistral Small 3.1
LMArena Text13971278
LMArena Creative Writing13801253
LMArena Multi-Turn14061270
EQ-Bench Creative Writing—761
WildBench—78.8%
EQ-Bench 41075—

Frequently asked questions

Is Grok 4.3 better than Mistral Small 3.1?

Grok 4.3 is the stronger model overall, scoring 43.6 to 31.4 on the Noometry Index. Mistral Small 3.1 costs 3.9× less per token, which makes it the better buy when Grok 4.3's lead doesn't matter for your workload.

Which is cheaper, Grok 4.3 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; Grok 4.3 lists at $1.25 and $2.50.

Is Grok 4.3 or Mistral Small 3.1 better for coding?

Grok 4.3 scores higher on coding benchmarks: 41.3 versus 37.7 in the Noometry coding category.

Which has the bigger context window?

Grok 4.3 does, with 1M tokens against 128K.

How many benchmarks do Grok 4.3 and Mistral Small 3.1 share?

22 benchmarks have published results for both models. Grok 4.3 has 40 scored results on Noometry and Mistral Small 3.1 has 28.

Related comparisons

Go deeper