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StepFun: Step 3.7 Flash vs xAI: Grok 4.3

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-07-27.

StepFun: Step 3.7 Flash xAI: Grok 4.3
Vendorstepfunx-ai
Quality Score100100
Benchmark Score50.358.0
Input Price$0.20/M$1.25/M
Output Price$1.15/M$2.50/M
Context Window262,1441,000,000
Max Output256,000-
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio--
Benchmark Scores
ai_index49.962.0
ai_index_agentic35.539.8
ai_index_coding65.369.7

Who wins by task?

TaskStepFun: Step 3.7 FlashxAI: Grok 4.3
SQL Generation 153 158
Code Review 146 155
Code Completion 130 120
Code Refactoring 144 155
Bug Fixing 155 164
Unit Test Generation 139 144
Code Documentation 133 139
Regex Writing 129 130
CI/CD Pipelines 131 136
Frontend Component Design 136 138
Data Analysis 150 153
CSV / Spreadsheet Cleanup 141 147
ETL Scripting 137 145
JSON Extraction 142 134
Bulk Data Labeling 133 124
OCR / Document Parsing 138 141
Table Extraction from PDFs 138 141
Long-Document Summarization 142 152
Short-Form Summarization 128 120
Blog Post Writing 129 134

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

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