Noometry

Model comparison

Grok 4 vs Step 3.5 Flash

Grok 4 is the stronger model overall, scoring 48.1 to 42.3 on the Noometry Index.

Last verified . 17 shared benchmarks.

Grok 4 xAI

48.1

Rank #56 Confirmed

Step 3.5 Flash StepFun

42.3

Rank #116 Confirmed

Summary

  • They share 17 benchmarks with published results for both. Grok 4 scores higher in 7 categories and Step 3.5 Flash in 1 category; 7 gaps are clear of the uncertainty.
  • The widest gap is in long context, where Grok 4 leads 63.1 to 42.8.
  • Step 3.5 Flash has downloadable open weights; the other is API-only.

Side by side

Grok 4Step 3.5 Flash
ProviderxAIStepFun
Noometry Index48.142.3
Released2025-07-092026-01-29
WeightsProprietaryOpen
Context window—256K
Max output—256K
Input $ / M tokens—$0.10
Output $ / M tokens—$0.30
Results tracked4819

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Category by category

Coding Grok 4 leads

Grok 4: 50.3 (#46), Step 3.5 Flash: 42.4 (#105)

BenchmarkGrok 4Step 3.5 Flash
LMArena Coding14081436
Aider Polyglot79.6%—
WeirdML45.7%—

Agentic & Tool Use Not comparable

Grok 4: 32.3 (#68), Step 3.5 Flash: —

BenchmarkGrok 4Step 3.5 Flash
Terminal-Bench27.2%—
Berkeley Function Calling Leaderboard63%—
GDPval21.1%—
Cybench43%—
DeepResearch Bench47.3%—
BALROG43.6%—
LMArena Search1142—
METR Time Horizons66.6%—

Reasoning Grok 4 leads

Grok 4: 36.7 (#65), Step 3.5 Flash: 22.2 (#202)

BenchmarkGrok 4Step 3.5 Flash
LMArena Hard Prompts14091411
ARC-AGI-216%—
SimpleBench60.5%—
Kagi LLM Benchmark73.6%—
NYT Connections (extended)—28.4%
ARC-AGI-166.7%—
Chess Puzzles28%—
Epoch Capabilities Index146.44—
ForecastBench60.9—

Math Grok 4 leads

Grok 4: 48.4 (#64), Step 3.5 Flash: 42.6 (#84)

BenchmarkGrok 4Step 3.5 Flash
LMArena Math14221408
MathArena Final-Answer Competitions—66.8%
OTIS Mock AIME 2024-202584%—
Omni-MATH60.3%—
FrontierMath (Feb 2025 set)19.7%—
FrontierMath Tier 4 (v1)2.1%—

Knowledge Grok 4 leads

Grok 4: 53.8 (#55), Step 3.5 Flash: 39.6 (#132)

BenchmarkGrok 4Step 3.5 Flash
LMArena Expert14151421
GPQA Diamond87%—
MMLU-Pro85.1%—
Confabulations12.4%—
GPQA (HELM)72.7%—

Multimodal Not comparable

Grok 4: 33.7 (#94), Step 3.5 Flash: —

BenchmarkGrok 4Step 3.5 Flash
LMArena Vision1210—
GeoBench45%—

Multilingual Grok 4 leads

Grok 4: 51.8 (#103), Step 3.5 Flash: 50.5 (#119)

BenchmarkGrok 4Step 3.5 Flash
LMArena Non-English14031385
LMArena Chinese14271447
LMArena French14181421
LMArena German14291405
LMArena Japanese13941354
LMArena Korean13771352
LMArena Russian14101385
LMArena Spanish14201419

Instruction Following Grok 4 leads

Grok 4: 79.2 (#5), Step 3.5 Flash: 73.1 (#124)

BenchmarkGrok 4Step 3.5 Flash
LMArena Instruction Following13871385
IFEval94.9%—

Long Context Grok 4 leads

Grok 4: 63.1 (#4), Step 3.5 Flash: 42.8 (#117)

BenchmarkGrok 4Step 3.5 Flash
LMArena Longer Query14091402
Fiction.LiveBench94.4%—

Writing & Preference Too close to call

Grok 4: 58.5 (#116), Step 3.5 Flash: 58.8 (#113)

BenchmarkGrok 4Step 3.5 Flash
LMArena Text14111403
LMArena Creative Writing13971357
LMArena Multi-Turn14161405
Short-Story Creative Writing76.9%—
WildBench79.7%—

Frequently asked questions

Is Grok 4 better than Step 3.5 Flash?

Grok 4 is the stronger model overall, scoring 48.1 to 42.3 on the Noometry Index.

Is Grok 4 or Step 3.5 Flash better for coding?

Grok 4 scores higher on coding benchmarks: 50.3 versus 42.4 in the Noometry coding category.

How many benchmarks do Grok 4 and Step 3.5 Flash share?

17 benchmarks have published results for both models. Grok 4 has 48 scored results on Noometry and Step 3.5 Flash has 19.

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