Noometry

Model comparison

Claude 3 Opus vs Step 3.5 Flash

Step 3.5 Flash is the stronger model overall, scoring 42.3 to 29.5 on the Noometry Index.

Last verified . 17 shared benchmarks.

Claude 3 Opus Anthropic

29.5

Rank #310 Confirmed

Step 3.5 Flash StepFun

42.3

Rank #116 Confirmed

Summary

  • They share 17 benchmarks with published results for both. Claude 3 Opus scores higher in 0 categories and Step 3.5 Flash in 8 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in math, where Step 3.5 Flash leads 42.6 to 14.8.
  • Step 3.5 Flash has downloadable open weights; the other is API-only.

Side by side

Claude 3 OpusStep 3.5 Flash
ProviderAnthropicStepFun
Noometry Index29.542.3
Released2024-02-292026-01-29
WeightsProprietaryOpen
Context window—256K
Max output—256K
Input $ / M tokens—$0.10
Output $ / M tokens—$0.30
Results tracked4619

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Category by category

Coding Step 3.5 Flash leads

Claude 3 Opus: 32.9 (#267), Step 3.5 Flash: 42.4 (#105)

BenchmarkClaude 3 OpusStep 3.5 Flash
LMArena Coding12641436
WeirdML19.2%—
BigCodeBench Instruct45.5%—
LiveBench Coding38.6%—
BigCodeBench Complete57.4%—
HumanEval+77.4%—
MBPP+73.3%—

Agentic & Tool Use Not comparable

Claude 3 Opus: 24.6 (#116), Step 3.5 Flash: —

BenchmarkClaude 3 OpusStep 3.5 Flash
Cybench10%—
METR Time Horizons29.5%—

Reasoning Step 3.5 Flash leads

Claude 3 Opus: 14.6 (#324), Step 3.5 Flash: 22.2 (#202)

BenchmarkClaude 3 OpusStep 3.5 Flash
LMArena Hard Prompts12451411
SimpleBench23.5%—
NYT Connections (extended)—28.4%
Chess Puzzles5%—
EnigmaEval0.8%—
LiveBench Reasoning40.6%—
DTBench61.6%—
LiveBench Data Analysis57.9%—
LMCA17%—
Epoch Capabilities Index126.91—
ForecastBench58.4—
LiveBench49.2%—
WinoGrande88.5%—

Math Step 3.5 Flash leads

Claude 3 Opus: 14.8 (#299), Step 3.5 Flash: 42.6 (#84)

BenchmarkClaude 3 OpusStep 3.5 Flash
LMArena Math12731408
MathArena Final-Answer Competitions—66.8%
OTIS Mock AIME 2024-20254.7%—
LiveBench Math43.6%—
MATH Level 537.5%—

Knowledge Step 3.5 Flash leads

Claude 3 Opus: 24.5 (#267), Step 3.5 Flash: 39.6 (#132)

BenchmarkClaude 3 OpusStep 3.5 Flash
LMArena Expert12231421
GPQA Diamond47.2%—
SimpleQA Verified12.6%—
Confabulations22.7%—
MMLU84.6%—

Multimodal Not comparable

Claude 3 Opus: 27.1 (#116), Step 3.5 Flash: —

BenchmarkClaude 3 OpusStep 3.5 Flash
LMArena Vision1023—

Multilingual Step 3.5 Flash leads

Claude 3 Opus: 41.4 (#207), Step 3.5 Flash: 50.5 (#119)

BenchmarkClaude 3 OpusStep 3.5 Flash
LMArena Non-English12581385
LMArena Chinese12481447
LMArena French12751421
LMArena German12581405
LMArena Japanese12041354
LMArena Korean11871352
LMArena Russian12801385
LMArena Spanish12461419

Instruction Following Step 3.5 Flash leads

Claude 3 Opus: 64.1 (#228), Step 3.5 Flash: 73.1 (#124)

BenchmarkClaude 3 OpusStep 3.5 Flash
LMArena Instruction Following12481385
LiveBench Instruction Following63.9%—

Long Context Step 3.5 Flash leads

Claude 3 Opus: 38.2 (#202), Step 3.5 Flash: 42.8 (#117)

BenchmarkClaude 3 OpusStep 3.5 Flash
LMArena Longer Query12591402

Writing & Preference Step 3.5 Flash leads

Claude 3 Opus: 47.2 (#213), Step 3.5 Flash: 58.8 (#113)

BenchmarkClaude 3 OpusStep 3.5 Flash
LMArena Text12621403
LMArena Creative Writing12351357
LMArena Multi-Turn12751405
LiveBench Language50.4%—

Frequently asked questions

Is Claude 3 Opus better than Step 3.5 Flash?

Step 3.5 Flash is the stronger model overall, scoring 42.3 to 29.5 on the Noometry Index.

Is Claude 3 Opus or Step 3.5 Flash better for coding?

Step 3.5 Flash scores higher on coding benchmarks: 42.4 versus 32.9 in the Noometry coding category.

How many benchmarks do Claude 3 Opus and Step 3.5 Flash share?

17 benchmarks have published results for both models. Claude 3 Opus has 46 scored results on Noometry and Step 3.5 Flash has 19.

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