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Anthropic: Claude Sonnet 5 vs StepFun: Step 3.7 Flash

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-08-13.

Anthropic: Claude Sonnet 5 StepFun: Step 3.7 Flash
Vendoranthropicstepfun
Quality Score100100
Benchmark Score91.650.1
Input Price$2.00/M$0.20/M
Output Price$10.00/M$1.15/M
Context Window1,000,000262,144
Max Output128,000256,000
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio--
Benchmark Scores
ai_index91.251.0
ai_index_agentic82.035.9
ai_index_coding100.065.3

Who wins by task?

TaskAnthropic: Claude Sonnet 5StepFun: Step 3.7 Flash
SQL Generation 172 153
Code Review 168 146
Code Completion 119 130
Code Refactoring 165 144
Bug Fixing 182 155
Unit Test Generation 155 139
Code Documentation 142 133
Regex Writing 135 129
CI/CD Pipelines 145 131
Frontend Component Design 147 136
Data Analysis 172 150
CSV / Spreadsheet Cleanup 153 141
ETL Scripting 155 138
JSON Extraction 139 142
Bulk Data Labeling 124 133
OCR / Document Parsing 147 138
Table Extraction from PDFs 147 138
Long-Document Summarization 160 142
Short-Form Summarization 122 128
Blog Post Writing 140 130

Scores reflect capability match + benchmark data + pricing for each task. Methodology →

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