StepFun: Step 3.7 Flash vs Mistral: Mistral Small 4
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| StepFun: Step 3.7 Flash | Mistral: Mistral Small 4 | |
|---|---|---|
| Vendor | stepfun | mistralai |
| Quality Score | 100 | 100 |
| Benchmark Score | 50.8 | 6.1 |
| Input Price | $0.20/M | $0.15/M |
| Output Price | $1.15/M | $0.60/M |
| Context Window | 262,144 | 262,144 |
| Max Output | 230,400 | 209,715 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | 49.9 | 7.7 |
| ai_index_agentic | 35.5 | - |
| ai_index_coding | 65.3 | - |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, Mistral Small 4 costs $0.30 and Step 3.7 Flash costs $0.49, so Mistral Small 4 is about 1.6 times cheaper for the same work.
Both read up to 262,144 tokens at once, roughly 393 pages of text.
Only Step 3.7 Flash offers video input.
On our blended benchmark score Step 3.7 Flash leads 50.8 to 6.1.
Across the 20 tasks where they differ, Step 3.7 Flash scores higher on 20 (SQL Generation, Code Review, Code Completion and others).
Step 3.7 Flash was released in May 2026 and Mistral Small 4 in March 2026.
Pick Step 3.7 Flash if you need video input, benchmark performance or the stronger all-round task scores; pick Mistral Small 4 if you need lower cost.
Costs use current list prices per million tokens; page counts assume about 0.75 words per token and 500 words per page.
Who wins by task?
| Task | StepFun: Step 3.7 Flash | Mistral: Mistral Small 4 |
|---|---|---|
| SQL Generation | 153 | 132 |
| Code Review | 146 | 127 |
| Code Completion | 130 | 129 |
| Code Refactoring | 144 | 129 |
| Bug Fixing | 155 | 131 |
| Unit Test Generation | 139 | 122 |
| Code Documentation | 133 | 127 |
| Regex Writing | 129 | 120 |
| CI/CD Pipelines | 131 | 118 |
| Frontend Component Design | 136 | 122 |
| Data Analysis | 150 | 125 |
| CSV / Spreadsheet Cleanup | 141 | 128 |
| ETL Scripting | 137 | 123 |
| JSON Extraction | 142 | 131 |
| Bulk Data Labeling | 133 | 129 |
| OCR / Document Parsing | 138 | 128 |
| Table Extraction from PDFs | 138 | 128 |
| Long-Document Summarization | 142 | 130 |
| Short-Form Summarization | 128 | 124 |
| Blog Post Writing | 129 | 120 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →