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StepFun: Step 3.7 Flash vs Anthropic: Claude Sonnet Latest

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-09-23.

	StepFun: Step 3.7 Flash	Anthropic: Claude Sonnet Latest
Vendor	stepfun	~anthropic
Quality Score	100	100
Benchmark Score	29.1	-
Input Price	$0.20/M	$2.00/M
Output Price	$1.15/M	$10.00/M
Context Window	262,144	1,000,000
Max Output	230,400	128,000
Tool Calling	✓	✓
Structured Output	✓	✓
Reasoning Mode	✓	✓
Vision	✓	✓
Audio	-	-
Benchmark Scores
ai_index	32.1	-

Who wins by task?

Task	StepFun: Step 3.7 Flash	Anthropic: Claude Sonnet Latest
SQL Generation	135	132
Code Review	132	132
Code Completion	129	117
Code Refactoring	132	136
Bug Fixing	136	136
Unit Test Generation	125	124
Code Documentation	129	129
Regex Writing	122	117
CI/CD Pipelines	121	120
Frontend Component Design	125	122
Data Analysis	128	124
CSV / Spreadsheet Cleanup	129	132
ETL Scripting	127	128
JSON Extraction	131	121
Bulk Data Labeling	129	118
OCR / Document Parsing	129	131
Table Extraction from PDFs	129	131
Long-Document Summarization	134	136
Short-Form Summarization	125	113
Blog Post Writing	123	120

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