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StepFun: Step 3.7 Flash vs OpenAI: GPT-5.4 Nano

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-06-12.

StepFun: Step 3.7 Flash OpenAI: GPT-5.4 Nano
Vendorstepfunopenai
Quality Score100100
Benchmark Score74.473.0
Input Price$0.20/M$0.20/M
Output Price$1.15/M$1.25/M
Context Window256,000400,000
Max Output256,000128,000
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio--
Benchmark Scores
ai_index70.372.6
ai_index_agentic98.278.5
ai_index_coding61.272.4

Who wins by task?

TaskStepFun: Step 3.7 FlashOpenAI: GPT-5.4 Nano
SQL Generation 163 165
Code Review 156 161
Code Completion 130 133
Code Refactoring 151 159
Bug Fixing 171 175
Unit Test Generation 146 149
Code Documentation 136 142
Regex Writing 135 134
CI/CD Pipelines 137 140
Frontend Component Design 142 142
Data Analysis 166 164
CSV / Spreadsheet Cleanup 143 150
ETL Scripting 144 150
JSON Extraction 143 144
Bulk Data Labeling 133 134
OCR / Document Parsing 139 143
Table Extraction from PDFs 139 143
Long-Document Summarization 148 157
Short-Form Summarization 131 131
Blog Post Writing 135 138

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

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