head-to-head
MoonshotAI: Kimi K3 vs StepFun: Step 3.7 Flash
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-08-13.
| MoonshotAI: Kimi K3 | StepFun: Step 3.7 Flash | |
|---|---|---|
| Vendor | moonshotai | stepfun |
| Quality Score | 100 | 100 |
| Benchmark Score | 96.9 | 50.1 |
| Input Price | $3.00/M | $0.20/M |
| Output Price | $15.00/M | $1.15/M |
| Context Window | 1,048,576 | 262,144 |
| Max Output | - | 256,000 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | 98.5 | 51.0 |
| ai_index_agentic | 89.5 | 35.9 |
| ai_index_coding | 100.0 | 65.3 |
Who wins by task?
| Task | MoonshotAI: Kimi K3 | StepFun: Step 3.7 Flash |
|---|---|---|
| SQL Generation | 173 | 153 |
| Code Review | 170 | 146 |
| Code Completion | 118 | 130 |
| Code Refactoring | 167 | 144 |
| Bug Fixing | 185 | 155 |
| Unit Test Generation | 157 | 139 |
| Code Documentation | 141 | 133 |
| Regex Writing | 135 | 129 |
| CI/CD Pipelines | 147 | 131 |
| Frontend Component Design | 149 | 136 |
| Data Analysis | 175 | 150 |
| CSV / Spreadsheet Cleanup | 153 | 141 |
| ETL Scripting | 157 | 138 |
| JSON Extraction | 138 | 142 |
| Bulk Data Labeling | 122 | 133 |
| OCR / Document Parsing | 147 | 138 |
| Table Extraction from PDFs | 147 | 138 |
| Long-Document Summarization | 161 | 142 |
| Short-Form Summarization | 122 | 128 |
| Blog Post Writing | 141 | 130 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →
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