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OpenAI: GPT-5.6 Luna Pro vs StepFun: Step 3.7 Flash

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-07-10.

OpenAI: GPT-5.6 Luna Pro StepFun: Step 3.7 Flash
Vendoropenaistepfun
Quality Score100100
Benchmark Score-49.6
Input Price$1.00/M$0.20/M
Output Price$6.00/M$1.15/M
Context Window1,050,000256,000
Max Output128,000256,000
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio--
Benchmark Scores
ai_index-49.1
ai_index_agentic-35.5
ai_index_coding-61.6

Who wins by task?

TaskOpenAI: GPT-5.6 Luna ProStepFun: Step 3.7 Flash
SQL Generation 133 152
Code Review 132 145
Code Completion 118 129
Code Refactoring 136 143
Bug Fixing 136 154
Unit Test Generation 124 138
Code Documentation 130 132
Regex Writing 118 129
CI/CD Pipelines 120 131
Frontend Component Design 122 135
Data Analysis 124 149
CSV / Spreadsheet Cleanup 133 140
ETL Scripting 128 137
JSON Extraction 122 142
Bulk Data Labeling 119 133
OCR / Document Parsing 131 137
Table Extraction from PDFs 131 137
Long-Document Summarization 137 141
Short-Form Summarization 114 128
Blog Post Writing 121 129

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

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