head-to-head

Anthropic: Claude Sonnet 5 (batch) 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 (batch)	StepFun: Step 3.7 Flash
Vendor	anthropic	stepfun
Quality Score	100	100
Benchmark Score	91.6	50.1
Input Price	$1.00/M	$0.20/M
Output Price	$5.00/M	$1.15/M
Context Window	1,000,000	262,144
Max Output	128,000	256,000
Tool Calling	✓	✓
Structured Output	✓	✓
Reasoning Mode	✓	✓
Vision	✓	✓
Audio	-	-
Benchmark Scores
ai_index	91.2	51.0
ai_index_agentic	82.0	35.9
ai_index_coding	100.0	65.3

Who wins by task?

Task	Anthropic: Claude Sonnet 5 (batch)	StepFun: Step 3.7 Flash
SQL Generation	172	153
Code Review	168	146
Code Completion	120	130
Code Refactoring	165	144
Bug Fixing	182	155
Unit Test Generation	155	139
Code Documentation	143	133
Regex Writing	136	129
CI/CD Pipelines	145	131
Frontend Component Design	147	136
Data Analysis	172	150
CSV / Spreadsheet Cleanup	154	141
ETL Scripting	155	138
JSON Extraction	140	142
Bulk Data Labeling	126	133
OCR / Document Parsing	147	138
Table Extraction from PDFs	147	138
Long-Document Summarization	160	142
Short-Form Summarization	123	128
Blog Post Writing	141	130

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