Noometry

Model comparison

Gemini 3.8 Flash vs Grok 4.6

Gemini 3.8 Flash is the stronger model overall, scoring 61.8 to 56.9 on the Noometry Index.

Last verified . 46 shared benchmarks.

Gemini 3.8 Flash Google

61.8

Rank #11 Confirmed

Grok 4.6 xAI

56.9

Rank #21 Confirmed

Summary

  • They share 46 benchmarks with published results for both. Gemini 3.8 Flash scores higher in 8 categories and Grok 4.6 in 2 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Gemini 3.8 Flash leads 76.9 to 61.4.
  • The biggest single-benchmark swing is ARC-AGI-2: 89.2% for Gemini 3.8 Flash and 67.1% for Grok 4.6.
  • Gemini 3.8 Flash is cheaper at $0.75 / $3.75 per million input/output tokens, against $2 / $6 for Grok 4.6.
  • Gemini 3.8 Flash accepts more context: 1.05M tokens versus 500K.

Side by side

Gemini 3.8 FlashGrok 4.6
ProviderGooglexAI
Noometry Index61.856.9
Released2026-09-022026-08-12
WeightsProprietaryProprietary
Context window1.05M500K
Max output66K500K
Input $ / M tokens$0.75$2
Output $ / M tokens$3.75$6
Results tracked5049

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Category by category

Coding Too close to call

Gemini 3.8 Flash: 59.2 (#15), Grok 4.6: 58.5 (#16)

BenchmarkGemini 3.8 FlashGrok 4.6
DeepSWE73.8%67.5%
FrontierCode41.2%48%
CursorBench39.6%41.4%
LMArena WebDev15841617
FrontierSWE19.6%25.3%
SciCode56.6%56.5%
WeirdML84.8%67.3%
LMArena Coding15101465
ALE-Bench1,2701,508

Agentic & Tool Use Gemini 3.8 Flash leads

Gemini 3.8 Flash: 41.8 (#21), Grok 4.6: 39.4 (#27)

BenchmarkGemini 3.8 FlashGrok 4.6
APEX-Agents64.3%65.3%
GDP.pdf23.4%17.2%
Vending-Bench 25,0949,047
Remote Labor Index5.8%—

Reasoning Gemini 3.8 Flash leads

Gemini 3.8 Flash: 76.9 (#5), Grok 4.6: 61.4 (#20)

BenchmarkGemini 3.8 FlashGrok 4.6
ARC-AGI-289.2%67.1%
NYT Connections (extended)97.4%80%
ARC-AGI-198.5%87.5%
CritPt18.3%19.7%
Chess Puzzles61%40%
LMArena Hard Prompts15081447
Mystery Game Puzzles47%34%
DTBench95.7%97.3%
LMCA52.9%48.5%
Epoch Capabilities Index156.71156.44
SimpleBench—75.9%
EBR-Bench—30.5%
Surface Evolver Bench76.9%—

Math Grok 4.6 leads

Gemini 3.8 Flash: 65.3 (#28), Grok 4.6: 67.0 (#24)

BenchmarkGemini 3.8 FlashGrok 4.6
FrontierMath (Tiers 1-3)68.4%66%
FrontierMath Tier 422%31.7%
OTIS Mock AIME 2024-202598.9%99.2%
ProofBench48%51%
LMArena Math15281423

Knowledge Gemini 3.8 Flash leads

Gemini 3.8 Flash: 74.8 (#2), Grok 4.6: 63.3 (#20)

BenchmarkGemini 3.8 FlashGrok 4.6
GPQA Diamond95.4%94%
SimpleQA Verified69.7%49.3%
LMArena Expert15241467
Humanity's Last Exam44.5%—

Multimodal Grok 4.6 leads

Gemini 3.8 Flash: 40.7 (#45), Grok 4.6: 43.6 (#23)

BenchmarkGemini 3.8 FlashGrok 4.6
LMArena Vision13141263
Blueprint-Bench 238.6%33.2%
Furniture Assembly31.7%40%
LMArena Document—1452

Multilingual Gemini 3.8 Flash leads

Gemini 3.8 Flash: 58.0 (#5), Grok 4.6: 53.0 (#74)

BenchmarkGemini 3.8 FlashGrok 4.6
LMArena Non-English14911420
LMArena Chinese15541480
LMArena French14981461
LMArena German14931431
LMArena Japanese15021376
LMArena Korean14591397
LMArena Russian15151422
LMArena Spanish14851404

Instruction Following Gemini 3.8 Flash leads

Gemini 3.8 Flash: 78.0 (#13), Grok 4.6: 75.4 (#63)

BenchmarkGemini 3.8 FlashGrok 4.6
LMArena Instruction Following14901431

Long Context Gemini 3.8 Flash leads

Gemini 3.8 Flash: 46.3 (#24), Grok 4.6: 44.5 (#66)

BenchmarkGemini 3.8 FlashGrok 4.6
LMArena Longer Query15081454

Writing & Preference Gemini 3.8 Flash leads

Gemini 3.8 Flash: 72.2 (#15), Grok 4.6: 62.3 (#80)

BenchmarkGemini 3.8 FlashGrok 4.6
LMArena Text14991428
LMArena Creative Writing14921428
LMArena Multi-Turn15011425
EQ-Bench Creative Writing1748—

Frequently asked questions

Is Gemini 3.8 Flash better than Grok 4.6?

Gemini 3.8 Flash is the stronger model overall, scoring 61.8 to 56.9 on the Noometry Index.

Which is cheaper, Gemini 3.8 Flash or Grok 4.6?

Gemini 3.8 Flash is cheaper. It lists at $0.75 per million input tokens and $3.75 per million output tokens; Grok 4.6 lists at $2 and $6.

Is Gemini 3.8 Flash or Grok 4.6 better for coding?

They score almost the same on coding (59.2 vs 58.5); test both on your own repository before choosing.

Which has the bigger context window?

Gemini 3.8 Flash does, with 1.05M tokens against 500K.

How many benchmarks do Gemini 3.8 Flash and Grok 4.6 share?

46 benchmarks have published results for both models. Gemini 3.8 Flash has 50 scored results on Noometry and Grok 4.6 has 49.

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