Noometry

Model comparison

GPT-5.4 mini vs Step 3

GPT-5.4 mini is the stronger model overall, scoring 44.8 to 39.9 on the Noometry Index.

Last verified . 17 shared benchmarks.

GPT-5.4 mini OpenAI

44.8

Rank #69 Confirmed

Step 3 StepFun

39.9

Rank #145 Confirmed

Summary

  • They share 17 benchmarks with published results for both. GPT-5.4 mini scores higher in 9 categories and Step 3 in 0 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in knowledge, where GPT-5.4 mini leads 51.4 to 36.2.
  • The biggest single-benchmark swing is Kagi LLM Benchmark: 37.9% for GPT-5.4 mini and 62.3% for Step 3.
  • Step 3 has downloadable open weights; the other is API-only.

Side by side

GPT-5.4 miniStep 3
ProviderOpenAIStepFun
Noometry Index44.839.9
Released2026-03-17—
WeightsProprietaryOpen
Context window400K—
Max output128K—
Input $ / M tokens$0.75—
Output $ / M tokens$4.50—
Results tracked4617

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Category by category

Coding GPT-5.4 mini leads

GPT-5.4 mini: 45.0 (#67), Step 3: 39.5 (#144)

BenchmarkGPT-5.4 miniStep 3
LMArena Coding14381367
FrontierCode27%—
LMArena WebDev1397—
SciCode49.9%—
WeirdML60.3%—
ALE-Bench1,189—

Agentic & Tool Use Not comparable

GPT-5.4 mini: 29.6 (#74), Step 3: —

BenchmarkGPT-5.4 miniStep 3
DeepResearch Bench36.3%—

Reasoning GPT-5.4 mini leads

GPT-5.4 mini: 30.3 (#77), Step 3: 27.6 (#102)

BenchmarkGPT-5.4 miniStep 3
Kagi LLM Benchmark37.9%62.3%
LMArena Hard Prompts14241355
ARC-AGI-218.9%—
NYT Connections (extended)61.8%—
ARC-AGI-163.7%—
CritPt10%—
Chess Puzzles24%—
Thematic Generalization61.7%—
Mystery Game Puzzles11%—
DTBench80%—
LMCA40.8%—
Epoch Capabilities Index148.83—
ForecastBench57—

Math GPT-5.4 mini leads

GPT-5.4 mini: 45.4 (#63), Step 3: 34.9 (#148)

BenchmarkGPT-5.4 miniStep 3
LMArena Math14181366
FrontierMath (Tiers 1-3)51.2%—
FrontierMath Tier 49.8%—
OTIS Mock AIME 2024-202588.9%—
ProofBench21%—
FrontierMath (Feb 2025 set)28.3%—
FrontierMath Tier 4 (v1)2.1%—

Knowledge GPT-5.4 mini leads

GPT-5.4 mini: 51.4 (#62), Step 3: 36.2 (#161)

BenchmarkGPT-5.4 miniStep 3
LMArena Expert14341333
GPQA Diamond86.9%—
SimpleQA Verified29.4%—
Vectara Hallucination Rate5.5%—

Multimodal GPT-5.4 mini leads

GPT-5.4 mini: 39.0 (#51), Step 3: 34.9 (#81)

BenchmarkGPT-5.4 miniStep 3
LMArena Vision12451176

Multilingual GPT-5.4 mini leads

GPT-5.4 mini: 52.1 (#94), Step 3: 46.5 (#154)

BenchmarkGPT-5.4 miniStep 3
LMArena Non-English14051327
LMArena Chinese14461396
LMArena German14071371
LMArena Korean13691271
LMArena Russian14171331
LMArena Spanish14031372
LMArena French1440—
LMArena Japanese1375—

Instruction Following GPT-5.4 mini leads

GPT-5.4 mini: 74.3 (#99), Step 3: 70.6 (#159)

BenchmarkGPT-5.4 miniStep 3
LMArena Instruction Following14051332

Long Context GPT-5.4 mini leads

GPT-5.4 mini: 42.9 (#107), Step 3: 40.3 (#152)

BenchmarkGPT-5.4 miniStep 3
LMArena Longer Query14071326

Writing & Preference GPT-5.4 mini leads

GPT-5.4 mini: 64.2 (#56), Step 3: 54.5 (#146)

BenchmarkGPT-5.4 miniStep 3
LMArena Text14111351
LMArena Creative Writing13701322
LMArena Multi-Turn14291340
EQ-Bench Creative Writing1665—

Frequently asked questions

Is GPT-5.4 mini better than Step 3?

GPT-5.4 mini is the stronger model overall, scoring 44.8 to 39.9 on the Noometry Index.

Is GPT-5.4 mini or Step 3 better for coding?

GPT-5.4 mini scores higher on coding benchmarks: 45.0 versus 39.5 in the Noometry coding category.

How many benchmarks do GPT-5.4 mini and Step 3 share?

17 benchmarks have published results for both models. GPT-5.4 mini has 46 scored results on Noometry and Step 3 has 17.

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