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OpenAI: GPT-5.6 Sol Pro (batch) vs StepFun: Step 3.7 Flash

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

OpenAI: GPT-5.6 Sol Pro (batch) StepFun: Step 3.7 Flash
Vendoropenaistepfun
Quality Score100100
Benchmark Score-50.1
Input Price$2.50/M$0.20/M
Output Price$15.00/M$1.15/M
Context Window1,050,000262,144
Max Output128,000256,000
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio--
Benchmark Scores
ai_index-51.0
ai_index_agentic-35.9
ai_index_coding-65.3

Who wins by task?

TaskOpenAI: GPT-5.6 Sol Pro (batch)StepFun: Step 3.7 Flash
SQL Generation 132 153
Code Review 132 146
Code Completion 116 130
Code Refactoring 136 144
Bug Fixing 136 155
Unit Test Generation 124 139
Code Documentation 128 133
Regex Writing 116 129
CI/CD Pipelines 120 131
Frontend Component Design 122 136
Data Analysis 124 150
CSV / Spreadsheet Cleanup 132 141
ETL Scripting 128 138
JSON Extraction 120 142
Bulk Data Labeling 116 133
OCR / Document Parsing 131 138
Table Extraction from PDFs 131 138
Long-Document Summarization 136 142
Short-Form Summarization 112 128
Blog Post Writing 120 130

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

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