Noometry

Model comparison

Claude Opus 4 vs Step 3

Claude Opus 4 is the stronger model overall, scoring 43.1 to 40.5 on the Noometry Index.

Last verified . 17 shared benchmarks.

Claude Opus 4 Anthropic

43.1

Rank #100 Confirmed

Step 3 StepFun

40.5

Rank #149 Confirmed

Summary

  • They share 17 benchmarks with published results for both. Claude Opus 4 scores higher in 6 categories and Step 3 in 3 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in knowledge, where Claude Opus 4 leads 44.0 to 36.8.
  • The biggest single-benchmark swing is Kagi LLM Benchmark: 74.3% for Claude Opus 4 and 62.3% for Step 3.
  • Step 3 has downloadable open weights; the other is API-only.

Side by side

Claude Opus 4Step 3
ProviderAnthropicStepFun
Noometry Index43.140.5
Released2025-05-22—
WeightsProprietaryOpen
Context window200K—
Max output32K—
Input $ / M tokens$15—
Output $ / M tokens$75—
Results tracked5617

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Category by category

Coding Claude Opus 4 leads

Claude Opus 4: 47.2 (#62), Step 3: 40.1 (#147)

BenchmarkClaude Opus 4Step 3
LMArena Coding14421367
SWE-bench Verified70.7%—
SWE-bench Verified (bash only)67.6%—
Aider Polyglot72%—
GSO6.9%—
WeirdML43.7%—
AlgoTune1.33—

Agentic & Tool Use Not comparable

Claude Opus 4: 34.8 (#42), Step 3: —

BenchmarkClaude Opus 4Step 3
Cybench38%—
DeepResearch Bench46.8%—
LMArena Search1127—
METR Time Horizons63.9%—

Reasoning Step 3 leads

Claude Opus 4: 27.3 (#121), Step 3: 28.4 (#105)

BenchmarkClaude Opus 4Step 3
Kagi LLM Benchmark74.3%62.3%
LMArena Hard Prompts13991355
ARC-AGI-28.6%—
SimpleBench58.8%—
ARC-AGI-135.7%—
CritPt0.3%—
EnigmaEval5.6%—
DTBench81.6%—
LMCA37.4%—
Epoch Capabilities Index142.67—
ForecastBench61.1—

Math Claude Opus 4 leads

Claude Opus 4: 42.0 (#86), Step 3: 37.6 (#148)

BenchmarkClaude Opus 4Step 3
LMArena Math13901366
OTIS Mock AIME 2024-202564.4%—
Omni-MATH61.6%—
MATH Level 585%—
FrontierMath (Feb 2025 set)4.5%—
FrontierMath Tier 4 (v1)4.2%—

Knowledge Claude Opus 4 leads

Claude Opus 4: 44.0 (#88), Step 3: 36.8 (#164)

BenchmarkClaude Opus 4Step 3
LMArena Expert13861333
GPQA Diamond76.3%—
Humanity's Last Exam10.7%—
MMLU-Pro87.5%—
Confabulations15.9%—
Vectara Hallucination Rate12%—
GPQA (HELM)70.8%—

Multimodal Step 3 leads

Claude Opus 4: 31.5 (#106), Step 3: 35.5 (#86)

BenchmarkClaude Opus 4Step 3
LMArena Vision11921177
GeoBench49%—
VPCT38%—

Multilingual Claude Opus 4 leads

Claude Opus 4: 48.8 (#138), Step 3: 46.3 (#159)

BenchmarkClaude Opus 4Step 3
LMArena Non-English13621327
LMArena Chinese13861397
LMArena German13911371
LMArena Korean13211269
LMArena Russian13921331
LMArena Spanish13891371
LMArena French1372—
LMArena Japanese1331—

Instruction Following Claude Opus 4 leads

Claude Opus 4: 77.1 (#28), Step 3: 70.4 (#164)

BenchmarkClaude Opus 4Step 3
LMArena Instruction Following14061332
IFEval91.8%—

Long Context Too close to call

Claude Opus 4: 39.6 (#172), Step 3: 40.3 (#157)

BenchmarkClaude Opus 4Step 3
LMArena Longer Query14221326
Fiction.LiveBench61.1%—

Writing & Preference Claude Opus 4 leads

Claude Opus 4: 61.2 (#89), Step 3: 54.3 (#151)

BenchmarkClaude Opus 4Step 3
LMArena Text13771350
LMArena Creative Writing13871321
LMArena Multi-Turn13961341
Short-Story Creative Writing83.6%—
EQ-Bench Creative Writing1580—
WildBench85.2%—

Frequently asked questions

Is Claude Opus 4 better than Step 3?

Claude Opus 4 is the stronger model overall, scoring 43.1 to 40.5 on the Noometry Index.

Is Claude Opus 4 or Step 3 better for coding?

Claude Opus 4 scores higher on coding benchmarks: 47.2 versus 40.1 in the Noometry coding category.

How many benchmarks do Claude Opus 4 and Step 3 share?

17 benchmarks have published results for both models. Claude Opus 4 has 56 scored results on Noometry and Step 3 has 17.

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