Noometry

Model comparison

DeepSeek V4 Flash vs Grok 4 Fast

DeepSeek V4 Flash is the stronger model overall, scoring 53.6 to 39.4 on the Noometry Index.

Last verified . 24 shared benchmarks.

DeepSeek V4 Flash DeepSeek

53.6

Rank #35 Confirmed

Grok 4 Fast xAI

39.4

Rank #167 Confirmed

Summary

  • They share 24 benchmarks with published results for both. DeepSeek V4 Flash scores higher in 7 categories and Grok 4 Fast in 1 category; 8 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where DeepSeek V4 Flash leads 53.7 to 22.2.
  • The biggest single-benchmark swing is ARC-AGI-2: 61.4% for DeepSeek V4 Flash and 5.3% for Grok 4 Fast.
  • DeepSeek V4 Flash has downloadable open weights; the other is API-only.

Side by side

DeepSeek V4 FlashGrok 4 Fast
ProviderDeepSeekxAI
Noometry Index53.639.4
Released2026-04-242025-09-19
WeightsOpenProprietary
Context window1M—
Max output393K—
Input $ / M tokens$0.15—
Output $ / M tokens$0.60—
Results tracked4130

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

Category by category

Coding DeepSeek V4 Flash leads

DeepSeek V4 Flash: 47.9 (#59), Grok 4 Fast: 32.5 (#271)

BenchmarkDeepSeek V4 FlashGrok 4 Fast
LMArena WebDev15821159
WeirdML63%42.9%
LMArena Coding14571429
FrontierCode18.8%—
SciCode49.9%—
ALE-Bench1,306—

Agentic & Tool Use Not comparable

DeepSeek V4 Flash: —, Grok 4 Fast: 29.5 (#86)

BenchmarkDeepSeek V4 FlashGrok 4 Fast
τ²-bench Banking—15.7%
Cybench—30%
LMArena Search—1171

Reasoning DeepSeek V4 Flash leads

DeepSeek V4 Flash: 53.7 (#30), Grok 4 Fast: 22.2 (#201)

BenchmarkDeepSeek V4 FlashGrok 4 Fast
ARC-AGI-261.4%5.3%
Kagi LLM Benchmark52.2%66.1%
ARC-AGI-189%48.5%
LMArena Hard Prompts14441412
DTBench90.9%82.7%
Epoch Capabilities Index154.49144.2
SimpleBench61.1%—
NYT Connections (extended)89.6%—
CritPt16.6%—
Chess Puzzles33%—
Mystery Game Puzzles34%—
LMCA41.7%—
ForecastBench—60.5

Math DeepSeek V4 Flash leads

DeepSeek V4 Flash: 60.3 (#37), Grok 4 Fast: 38.9 (#123)

BenchmarkDeepSeek V4 FlashGrok 4 Fast
LMArena Math14271419
FrontierMath (Tiers 1-3)57.5%—
FrontierMath Tier 424.4%—
MathArena Final-Answer Competitions76.5%—
OTIS Mock AIME 2024-202594.4%—
ProofBench56%—

Knowledge DeepSeek V4 Flash leads

DeepSeek V4 Flash: 55.4 (#48), Grok 4 Fast: 32.0 (#214)

BenchmarkDeepSeek V4 FlashGrok 4 Fast
LMArena Expert14411411
GPQA Diamond91%—
SimpleQA Verified33.6%—
Vectara Hallucination Rate—19.7%

Multilingual DeepSeek V4 Flash leads

DeepSeek V4 Flash: 53.0 (#72), Grok 4 Fast: 51.3 (#111)

BenchmarkDeepSeek V4 FlashGrok 4 Fast
LMArena Non-English14201396
LMArena Chinese14681457
LMArena French14391431
LMArena German14181383
LMArena Japanese14061352
LMArena Korean13841357
LMArena Russian14281389
LMArena Spanish14361415

Instruction Following DeepSeek V4 Flash leads

DeepSeek V4 Flash: 74.9 (#81), Grok 4 Fast: 73.2 (#121)

BenchmarkDeepSeek V4 FlashGrok 4 Fast
LMArena Instruction Following14211387

Long Context Grok 4 Fast leads

DeepSeek V4 Flash: 43.8 (#85), Grok 4 Fast: 63.2 (#3)

BenchmarkDeepSeek V4 FlashGrok 4 Fast
LMArena Longer Query14341415
Fiction.LiveBench—94.4%

Writing & Preference DeepSeek V4 Flash leads

DeepSeek V4 Flash: 63.8 (#61), Grok 4 Fast: 60.0 (#102)

BenchmarkDeepSeek V4 FlashGrok 4 Fast
LMArena Text14321407
LMArena Creative Writing14031387
LMArena Multi-Turn14491414
EQ-Bench Creative Writing1559—

Frequently asked questions

Is DeepSeek V4 Flash better than Grok 4 Fast?

DeepSeek V4 Flash is the stronger model overall, scoring 53.6 to 39.4 on the Noometry Index.

Is DeepSeek V4 Flash or Grok 4 Fast better for coding?

DeepSeek V4 Flash scores higher on coding benchmarks: 47.9 versus 32.5 in the Noometry coding category.

How many benchmarks do DeepSeek V4 Flash and Grok 4 Fast share?

24 benchmarks have published results for both models. DeepSeek V4 Flash has 41 scored results on Noometry and Grok 4 Fast has 30.

Related comparisons

Go deeper