Noometry

Model comparison

Claude Opus 4.1 vs Step 3

Claude Opus 4.1 and Step 3 score almost the same on the Noometry Index (41.0 vs 40.5), so choose on price, context window or the category you care about most.

Last verified . 15 shared benchmarks.

Claude Opus 4.1 Anthropic

41.0

Rank #142 Confirmed

Step 3 StepFun

40.5

Rank #149 Confirmed

Summary

  • They share 15 benchmarks with published results for both. Claude Opus 4.1 scores higher in 7 categories and Step 3 in 2 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in math, where Step 3 leads 37.6 to 22.3.
  • Step 3 has downloadable open weights; the other is API-only.

Side by side

Claude Opus 4.1Step 3
ProviderAnthropicStepFun
Noometry Index41.040.5
Released2025-08-05—
WeightsProprietaryOpen
Context window200K—
Max output32K—
Input $ / M tokens$15—
Output $ / M tokens$75—
Results tracked4817

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Category by category

Coding Claude Opus 4.1 leads

Claude Opus 4.1: 44.4 (#73), Step 3: 40.1 (#147)

BenchmarkClaude Opus 4.1Step 3
LMArena Coding14791367
SWE-bench Verified73.3%—
LMArena WebDev1390—
WeirdML45.9%—
ALE-Bench674.77—
AlgoTune1.34—

Agentic & Tool Use Not comparable

Claude Opus 4.1: 35.0 (#41), Step 3: —

BenchmarkClaude Opus 4.1Step 3
Terminal-Bench38%—
GDPval43.6%—
Cybench42%—
DeepResearch Bench48.3%—
LMArena Search1148—
METR Time Horizons66.8%—

Reasoning Claude Opus 4.1 leads

Claude Opus 4.1: 32.2 (#76), Step 3: 28.4 (#105)

BenchmarkClaude Opus 4.1Step 3
LMArena Hard Prompts14431355
SimpleBench60%—
Kagi LLM Benchmark—62.3%
Chess Puzzles7%—
EnigmaEval7.2%—
EBR-Bench7.9%—
Mystery Game Puzzles21%—
DTBench80%—
LMCA37.1%—
Epoch Capabilities Index144.12—
ForecastBench62—

Math Step 3 leads

Claude Opus 4.1: 22.3 (#277), Step 3: 37.6 (#148)

BenchmarkClaude Opus 4.1Step 3
LMArena Math14311366
FrontierMath (Tiers 1-3)12.6%—
FrontierMath Tier 42.4%—
OTIS Mock AIME 2024-202568.9%—
FrontierMath (Feb 2025 set)7.2%—
FrontierMath Tier 4 (v1)4.2%—

Knowledge Claude Opus 4.1 leads

Claude Opus 4.1: 42.0 (#101), Step 3: 36.8 (#164)

BenchmarkClaude Opus 4.1Step 3
LMArena Expert14391333
GPQA Diamond77.3%—
Humanity's Last Exam11.5%—
Confabulations17.1%—
Vectara Hallucination Rate11.8%—

Multimodal Step 3 leads

Claude Opus 4.1: 26.8 (#119), Step 3: 35.5 (#86)

BenchmarkClaude Opus 4.1Step 3
LMArena Vision—1177
VPCT35%—

Multilingual Claude Opus 4.1 leads

Claude Opus 4.1: 52.0 (#95), Step 3: 46.3 (#159)

BenchmarkClaude Opus 4.1Step 3
LMArena Non-English14051327
LMArena Chinese14271397
LMArena German14131371
LMArena Korean13801269
LMArena Russian14221331
LMArena Spanish14481371
LMArena French1431—
LMArena Japanese1378—

Instruction Following Claude Opus 4.1 leads

Claude Opus 4.1: 75.6 (#58), Step 3: 70.4 (#164)

BenchmarkClaude Opus 4.1Step 3
LMArena Instruction Following14351332

Long Context Claude Opus 4.1 leads

Claude Opus 4.1: 44.5 (#63), Step 3: 40.3 (#157)

BenchmarkClaude Opus 4.1Step 3
LMArena Longer Query14551326

Writing & Preference Claude Opus 4.1 leads

Claude Opus 4.1: 62.4 (#74), Step 3: 54.3 (#151)

BenchmarkClaude Opus 4.1Step 3
LMArena Text14191350
LMArena Creative Writing14121321
LMArena Multi-Turn14441341
Short-Story Creative Writing84.7%—

Frequently asked questions

Is Claude Opus 4.1 better than Step 3?

Claude Opus 4.1 and Step 3 score almost the same on the Noometry Index (41.0 vs 40.5), so choose on price, context window or the category you care about most.

Is Claude Opus 4.1 or Step 3 better for coding?

Claude Opus 4.1 scores higher on coding benchmarks: 44.4 versus 40.1 in the Noometry coding category.

How many benchmarks do Claude Opus 4.1 and Step 3 share?

15 benchmarks have published results for both models. Claude Opus 4.1 has 48 scored results on Noometry and Step 3 has 17.

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