Noometry

Model comparison

Gemini 3 Flash Preview vs Grok 4.1 Fast

Gemini 3 Flash Preview is the stronger model overall, scoring 52.3 to 40.9 on the Noometry Index. Grok 4.1 Fast costs 4.1× less per token, which makes it the better buy when Gemini 3 Flash Preview's lead doesn't matter for your workload.

Last verified . 30 shared benchmarks.

Gemini 3 Flash Preview Google

52.3

Rank #33 Confirmed

Grok 4.1 Fast xAI

40.9

Rank #131 Confirmed

Summary

  • They share 30 benchmarks with published results for both. Gemini 3 Flash Preview scores higher in 10 categories and Grok 4.1 Fast in 0 categories; 10 gaps are clear of the uncertainty.
  • The widest gap is in knowledge, where Gemini 3 Flash Preview leads 58.8 to 32.6.
  • The biggest single-benchmark swing is τ²-bench Banking: 27.3% for Gemini 3 Flash Preview and 13.1% for Grok 4.1 Fast.
  • Grok 4.1 Fast is cheaper at $0.20 / $0.50 per million input/output tokens, against $0.50 / $3 for Gemini 3 Flash Preview.
  • Gemini 3 Flash Preview accepts more context: 1.05M tokens versus 128K.

Side by side

Gemini 3 Flash PreviewGrok 4.1 Fast
ProviderGooglexAI
Noometry Index52.340.9
Released2025-12-172025-06-27
WeightsProprietaryProprietary
Context window1.05M128K
Max output66K30K
Input $ / M tokens$0.50$0.20
Output $ / M tokens$3$0.50
Results tracked5932

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Category by category

Coding Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 51.5 (#35), Grok 4.1 Fast: 33.8 (#236)

BenchmarkGemini 3 Flash PreviewGrok 4.1 Fast
LMArena WebDev14391241
LMArena Coding14601411
ALE-Bench1,367394.93
SWE-bench Verified75.4%—
SWE-bench Verified (bash only)75.8%—
SWE-bench Multilingual72.7%—
GSO9.8%—
WeirdML61.6%—

Agentic & Tool Use Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 38.6 (#27), Grok 4.1 Fast: 36.1 (#35)

BenchmarkGemini 3 Flash PreviewGrok 4.1 Fast
τ²-bench Banking27.3%13.1%
LMArena Search11981171
Vending-Bench 23,6351,107
Terminal-Bench64.3%—
Berkeley Function Calling Leaderboard—69.6%
τ²-bench Airline82.5%—
τ²-bench Retail76.8%—
τ²-bench Telecom91.2%—
DeepResearch Bench49.8%—
BALROG48.1%—
GDP.pdf10%—

Reasoning Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 49.2 (#35), Grok 4.1 Fast: 42.3 (#45)

BenchmarkGemini 3 Flash PreviewGrok 4.1 Fast
SimpleBench61.1%56%
NYT Connections (extended)83.1%87.4%
LMArena Hard Prompts14651407
DTBench89.1%87.7%
ForecastBench58.561
ARC-AGI-233.6%—
ARC-AGI-184.7%—
Chess Puzzles40%—
Mystery Game Puzzles26%—
LMCA43.1%—
Epoch Capabilities Index151.83—

Math Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 51.4 (#42), Grok 4.1 Fast: 30.9 (#201)

BenchmarkGemini 3 Flash PreviewGrok 4.1 Fast
MathArena Final-Answer Competitions67.6%60.9%
ProofBench15%4%
LMArena Math14721408
FrontierMath (Tiers 1-3)51.2%—
FrontierMath Tier 417.1%—
OTIS Mock AIME 2024-202595.6%—
FrontierMath (Feb 2025 set)35.6%—
FrontierMath Tier 4 (v1)4.2%—

Knowledge Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 58.8 (#30), Grok 4.1 Fast: 32.6 (#203)

BenchmarkGemini 3 Flash PreviewGrok 4.1 Fast
Vectara Hallucination Rate13.5%17.8%
LMArena Expert14611398
GPQA Diamond89.4%—
SimpleQA Verified66.8%—

Multimodal Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 45.3 (#15), Grok 4.1 Fast: 36.3 (#71)

BenchmarkGemini 3 Flash PreviewGrok 4.1 Fast
LMArena Vision12851201
GeoBench88%—
VPCT72.6%—
Blueprint-Bench 20%—
LMArena Document1413—

Multilingual Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 55.9 (#26), Grok 4.1 Fast: 51.1 (#110)

BenchmarkGemini 3 Flash PreviewGrok 4.1 Fast
LMArena Non-English14581391
LMArena Chinese15101441
LMArena French14781416
LMArena German14971404
LMArena Japanese14881347
LMArena Korean14431361
LMArena Russian14801387
LMArena Spanish14701411

Instruction Following Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 75.8 (#52), Grok 4.1 Fast: 72.8 (#127)

BenchmarkGemini 3 Flash PreviewGrok 4.1 Fast
LMArena Instruction Following14371376

Long Context Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 44.4 (#63), Grok 4.1 Fast: 42.4 (#121)

BenchmarkGemini 3 Flash PreviewGrok 4.1 Fast
LMArena Longer Query14521390

Writing & Preference Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 65.6 (#44), Grok 4.1 Fast: 57.4 (#126)

BenchmarkGemini 3 Flash PreviewGrok 4.1 Fast
LMArena Text14661408
LMArena Creative Writing14571394
LMArena Multi-Turn14711389
EQ-Bench Creative Writing—1327

Frequently asked questions

Is Gemini 3 Flash Preview better than Grok 4.1 Fast?

Gemini 3 Flash Preview is the stronger model overall, scoring 52.3 to 40.9 on the Noometry Index. Grok 4.1 Fast costs 4.1× less per token, which makes it the better buy when Gemini 3 Flash Preview's lead doesn't matter for your workload.

Which is cheaper, Gemini 3 Flash Preview or Grok 4.1 Fast?

Grok 4.1 Fast is cheaper. It lists at $0.20 per million input tokens and $0.50 per million output tokens; Gemini 3 Flash Preview lists at $0.50 and $3.

Is Gemini 3 Flash Preview or Grok 4.1 Fast better for coding?

Gemini 3 Flash Preview scores higher on coding benchmarks: 51.5 versus 33.8 in the Noometry coding category.

Which has the bigger context window?

Gemini 3 Flash Preview does, with 1.05M tokens against 128K.

How many benchmarks do Gemini 3 Flash Preview and Grok 4.1 Fast share?

30 benchmarks have published results for both models. Gemini 3 Flash Preview has 59 scored results on Noometry and Grok 4.1 Fast has 32.

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