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StepFun: Step 3.7 Flash vs xAI: Grok 4.20

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

StepFun: Step 3.7 Flash xAI: Grok 4.20
Vendorstepfunx-ai
Quality Score100100
Benchmark Score50.361.1
Input Price$0.20/M$1.25/M
Output Price$1.15/M$2.50/M
Context Window262,1442,000,000
Max Output256,000-
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio--
Benchmark Scores
ai_index49.961.0
ai_index_agentic35.5-
ai_index_coding65.3-
eqbench-55.8

Who wins by task?

TaskStepFun: Step 3.7 FlashxAI: Grok 4.20
SQL Generation 153 144
Code Review 146 150
Code Completion 130 122
Code Refactoring 144 153
Bug Fixing 155 154
Unit Test Generation 139 135
Code Documentation 133 141
Regex Writing 129 127
CI/CD Pipelines 131 131
Frontend Component Design 136 131
Data Analysis 150 136
CSV / Spreadsheet Cleanup 141 139
ETL Scripting 137 142
JSON Extraction 142 123
Bulk Data Labeling 133 120
OCR / Document Parsing 138 135
Table Extraction from PDFs 138 135
Long-Document Summarization 142 154
Short-Form Summarization 128 119
Blog Post Writing 129 132

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

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