Noometry

Model comparison

Gemini 3.1 Pro Preview vs Grok 4.3

Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 43.8 on the Noometry Index. Grok 4.3 costs 2.9× less per token, which makes it the better buy when Gemini 3.1 Pro Preview's lead doesn't matter for your workload.

Last verified . 40 shared benchmarks.

Gemini 3.1 Pro Preview Google

56.7

Rank #23 Confirmed

Grok 4.3 xAI

43.8

Rank #86 Confirmed

Summary

  • They share 40 benchmarks with published results for both. Gemini 3.1 Pro Preview scores higher in 10 categories and Grok 4.3 in 0 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Gemini 3.1 Pro Preview leads 71.7 to 35.9.
  • The biggest single-benchmark swing is NYT Connections (extended): 97.4% for Gemini 3.1 Pro Preview and 55.2% for Grok 4.3.
  • Grok 4.3 is cheaper at $1.25 / $2.50 per million input/output tokens, against $2 / $12 for Gemini 3.1 Pro Preview.
  • Gemini 3.1 Pro Preview accepts more context: 1.05M tokens versus 1M.

Side by side

Gemini 3.1 Pro PreviewGrok 4.3
ProviderGooglexAI
Noometry Index56.743.8
Released2026-02-192026-04-17
WeightsProprietaryProprietary
Context window1.05M1M
Max output66K30K
Input $ / M tokens$2$1.25
Output $ / M tokens$12$2.50
Results tracked7140

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Category by category

Coding Too close to call

Gemini 3.1 Pro Preview: 42.5 (#99), Grok 4.3: 41.6 (#121)

BenchmarkGemini 3.1 Pro PreviewGrok 4.3
LMArena WebDev14471357
SciCode58.9%47.3%
WeirdML72.1%49.9%
LMArena Coding14841415
ALE-Bench1,161944.17
SWE-bench Verified75.6%—
DeepSWE11.7%—
GSO22.6%—
MirrorCode8.9%—
AlgoTune2.02—

Agentic & Tool Use Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 37.7 (#34), Grok 4.3: 27.7 (#99)

BenchmarkGemini 3.1 Pro PreviewGrok 4.3
GDP.pdf17%8%
LMArena Search12111165
Vending-Bench 23,77435.26
Terminal-Bench80.2%—
APEX-Agents35.3%—
τ²-bench Banking26%—
DeepResearch Bench47.8%—
PostTrainBench22%—
BALROG57%—
ExploitBench26.1%—
GBAEval0.8%—
METR Time Horizons77%—

Reasoning Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 71.7 (#12), Grok 4.3: 35.9 (#68)

BenchmarkGemini 3.1 Pro PreviewGrok 4.3
NYT Connections (extended)97.4%55.2%
CritPt17.7%8%
Chess Puzzles55%25%
LMArena Hard Prompts14851396
DTBench97.1%90.7%
LMCA53.8%38.3%
Epoch Capabilities Index154.77149.16
ForecastBench5960.3
ARC-AGI-277.1%—
SimpleBench79.6%—
ARC-AGI-198%—
EnigmaEval36.8%—
Thematic Generalization79.4%—
EBR-Bench14.3%—
Mystery Game Puzzles34%—

Math Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 62.1 (#34), Grok 4.3: 46.0 (#74)

BenchmarkGemini 3.1 Pro PreviewGrok 4.3
FrontierMath (Tiers 1-3)59.6%42.8%
FrontierMath Tier 426.8%14.6%
OTIS Mock AIME 2024-202595.6%93.3%
ProofBench26%11%
LMArena Math14851388
MathArena Final-Answer Competitions86.5%—
FrontierMath (Feb 2025 set)36.9%—
FrontierMath Tier 4 (v1)16.7%—

Knowledge Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 71.8 (#3), Grok 4.3: 52.5 (#62)

BenchmarkGemini 3.1 Pro PreviewGrok 4.3
GPQA Diamond94.4%88.8%
SimpleQA Verified73.5%33.2%
LMArena Expert14851385
Humanity's Last Exam46.4%—
Vectara Hallucination Rate10.4%—

Multimodal Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 37.9 (#69), Grok 4.3: 31.6 (#104)

BenchmarkGemini 3.1 Pro PreviewGrok 4.3
LMArena Vision12961229
Blueprint-Bench 226.5%0%
Furniture Assembly26.7%—
LMArena Document1444—

Multilingual Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 57.0 (#12), Grok 4.3: 50.5 (#120)

BenchmarkGemini 3.1 Pro PreviewGrok 4.3
LMArena Non-English14771385
LMArena Chinese15291422
LMArena French14871412
LMArena German14911395
LMArena Japanese14931379
LMArena Korean14551356
LMArena Russian14981399
LMArena Spanish14791398

Instruction Following Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 77.0 (#32), Grok 4.3: 72.1 (#140)

BenchmarkGemini 3.1 Pro PreviewGrok 4.3
LMArena Instruction Following14661366

Long Context Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 47.4 (#18), Grok 4.3: 42.5 (#123)

BenchmarkGemini 3.1 Pro PreviewGrok 4.3
LMArena Longer Query14831393
CL-bench20.8%—
CL-bench Life16.9%—

Writing & Preference Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 66.1 (#37), Grok 4.3: 58.5 (#118)

BenchmarkGemini 3.1 Pro PreviewGrok 4.3
LMArena Text14811397
LMArena Creative Writing14821380
EQ-Bench 411421075
LMArena Multi-Turn14881406
EQ-Bench Creative Writing1491—

Frequently asked questions

Is Gemini 3.1 Pro Preview better than Grok 4.3?

Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 43.8 on the Noometry Index. Grok 4.3 costs 2.9× less per token, which makes it the better buy when Gemini 3.1 Pro Preview's lead doesn't matter for your workload.

Which is cheaper, Gemini 3.1 Pro Preview or Grok 4.3?

Grok 4.3 is cheaper. It lists at $1.25 per million input tokens and $2.50 per million output tokens; Gemini 3.1 Pro Preview lists at $2 and $12.

Is Gemini 3.1 Pro Preview or Grok 4.3 better for coding?

They score almost the same on coding (42.5 vs 41.6); test both on your own repository before choosing.

Which has the bigger context window?

Gemini 3.1 Pro Preview does, with 1.05M tokens against 1M.

How many benchmarks do Gemini 3.1 Pro Preview and Grok 4.3 share?

40 benchmarks have published results for both models. Gemini 3.1 Pro Preview has 71 scored results on Noometry and Grok 4.3 has 40.

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