Noometry

Model comparison

Claude Sonnet 4.6 vs Step 3.7 Flash

Claude Sonnet 4.6 is the stronger model overall, scoring 50.3 to 37.3 on the Noometry Index. Step 3.7 Flash costs 14× less per token, which makes it the better buy when Claude Sonnet 4.6's lead doesn't matter for your workload.

Last verified . 4 shared benchmarks.

Claude Sonnet 4.6 Anthropic

50.3

Rank #50 Confirmed

Step 3.7 Flash StepFun

37.3

Rank #207 Reported

Summary

  • They share 4 benchmarks with published results for both. Claude Sonnet 4.6 scores higher in 3 categories and Step 3.7 Flash in 0 categories; 3 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Claude Sonnet 4.6 leads 46.1 to 21.6.
  • The biggest single-benchmark swing is NYT Connections (extended): 80.9% for Claude Sonnet 4.6 and 39.7% for Step 3.7 Flash.
  • Step 3.7 Flash is cheaper at $0.18 / $1.11 per million input/output tokens, against $3 / $15 for Claude Sonnet 4.6.
  • Claude Sonnet 4.6 accepts more context: 1M tokens versus 256K.
  • Step 3.7 Flash has downloadable open weights; the other is API-only.

Side by side

Claude Sonnet 4.6Step 3.7 Flash
ProviderAnthropicStepFun
Noometry Index50.337.3
Released2026-02-172026-05-29
WeightsProprietaryOpen
Context window1M256K
Max output128K256K
Input $ / M tokens$3$0.18
Output $ / M tokens$15$1.11
Results tracked575

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Category by category

Coding Claude Sonnet 4.6 leads

Claude Sonnet 4.6: 46.3 (#67), Step 3.7 Flash: 40.0 (#150)

BenchmarkClaude Sonnet 4.6Step 3.7 Flash
SciCode46.8%40%
ALE-Bench1,327694.12
SWE-bench Verified75.2%—
DeepSWE29.9%—
FrontierCode24.3%—
LMArena WebDev1522—
WeirdML66.1%—
LMArena Coding1504—

Agentic & Tool Use Not comparable

Claude Sonnet 4.6: 39.1 (#28), Step 3.7 Flash: —

BenchmarkClaude Sonnet 4.6Step 3.7 Flash
Terminal-Bench53.4%—
APEX-Agents43%—
OSWorld 2.09.3%—
DeepResearch Bench54.9%—
OSWorld72.1%—
ExploitBench23.6%—
GBAEval48.8%—
GDP.pdf18%—
LMArena Search1221—
Vending-Bench 27,204—

Reasoning Claude Sonnet 4.6 leads

Claude Sonnet 4.6: 46.1 (#45), Step 3.7 Flash: 21.6 (#219)

BenchmarkClaude Sonnet 4.6Step 3.7 Flash
NYT Connections (extended)80.9%39.7%
CritPt3.1%2.3%
ARC-AGI-260.4%—
ARC-AGI-186.5%—
Chess Puzzles13%—
Thematic Generalization76.3%—
LMArena Hard Prompts1484—
Mystery Game Puzzles16%—
DTBench89.9%—
LMCA46.5%—
Epoch Capabilities Index152.24—
ForecastBench62—

Math Claude Sonnet 4.6 leads

Claude Sonnet 4.6: 52.9 (#49), Step 3.7 Flash: 42.9 (#82)

BenchmarkClaude Sonnet 4.6Step 3.7 Flash
MathArena Final-Answer Competitions—68.5%
OTIS Mock AIME 2024-202585.8%—
ProofBench45%—
LMArena Math1462—
FrontierMath (Feb 2025 set)32.4%—
FrontierMath Tier 4 (v1)8.3%—

Knowledge Not comparable

Claude Sonnet 4.6: 51.7 (#65), Step 3.7 Flash: —

BenchmarkClaude Sonnet 4.6Step 3.7 Flash
GPQA Diamond87.4%—
SimpleQA Verified35.5%—
Vectara Hallucination Rate10.6%—
LMArena Expert1500—

Multimodal Not comparable

Claude Sonnet 4.6: 38.0 (#68), Step 3.7 Flash: —

BenchmarkClaude Sonnet 4.6Step 3.7 Flash
LMArena Vision1283—
Blueprint-Bench 26.7%—
LMArena Document1482—

Multilingual Not comparable

Claude Sonnet 4.6: 54.4 (#41), Step 3.7 Flash: —

BenchmarkClaude Sonnet 4.6Step 3.7 Flash
LMArena Non-English1440—
LMArena Chinese1491—
LMArena French1465—
LMArena German1428—
LMArena Japanese1420—
LMArena Korean1411—
LMArena Russian1440—
LMArena Spanish1464—

Instruction Following Not comparable

Claude Sonnet 4.6: 77.4 (#25), Step 3.7 Flash: —

BenchmarkClaude Sonnet 4.6Step 3.7 Flash
LMArena Instruction Following1475—

Long Context Not comparable

Claude Sonnet 4.6: 45.3 (#44), Step 3.7 Flash: —

BenchmarkClaude Sonnet 4.6Step 3.7 Flash
LMArena Longer Query1479—

Writing & Preference Not comparable

Claude Sonnet 4.6: 70.2 (#22), Step 3.7 Flash: —

BenchmarkClaude Sonnet 4.6Step 3.7 Flash
LMArena Text1458—
LMArena Creative Writing1435—
EQ-Bench Creative Writing1810—
EQ-Bench 41207—
LMArena Multi-Turn1464—

Frequently asked questions

Is Claude Sonnet 4.6 better than Step 3.7 Flash?

Claude Sonnet 4.6 is the stronger model overall, scoring 50.3 to 37.3 on the Noometry Index. Step 3.7 Flash costs 14× less per token, which makes it the better buy when Claude Sonnet 4.6's lead doesn't matter for your workload.

Which is cheaper, Claude Sonnet 4.6 or Step 3.7 Flash?

Step 3.7 Flash is cheaper. It lists at $0.18 per million input tokens and $1.11 per million output tokens; Claude Sonnet 4.6 lists at $3 and $15.

Is Claude Sonnet 4.6 or Step 3.7 Flash better for coding?

Claude Sonnet 4.6 scores higher on coding benchmarks: 46.3 versus 40.0 in the Noometry coding category.

Which has the bigger context window?

Claude Sonnet 4.6 does, with 1M tokens against 256K.

How many benchmarks do Claude Sonnet 4.6 and Step 3.7 Flash share?

4 benchmarks have published results for both models. Claude Sonnet 4.6 has 57 scored results on Noometry and Step 3.7 Flash has 5.

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