StepFun: Step 3.7 Flash vs ByteDance Seed: Seed-2.0-Lite
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| StepFun: Step 3.7 Flash | ByteDance Seed: Seed-2.0-Lite | |
|---|---|---|
| Vendor | stepfun | bytedance-seed |
| Quality Score | 100 | 100 |
| Benchmark Score | 50.8 | - |
| Input Price | $0.20/M | $0.25/M |
| Output Price | $1.15/M | $2.00/M |
| Context Window | 262,144 | 262,144 |
| Max Output | 230,400 | 131,072 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | 49.9 | - |
| 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, Step 3.7 Flash costs $0.49 and Seed-2.0-Lite costs $0.75, so Step 3.7 Flash is about 1.5 times cheaper for the same work.
Both read up to 262,144 tokens at once, roughly 393 pages of text.
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 Seed-2.0-Lite in March 2026.
Pick Step 3.7 Flash if you need lower cost or the stronger all-round task scores.
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 | ByteDance Seed: Seed-2.0-Lite |
|---|---|---|
| SQL Generation | 153 | 131 |
| Code Review | 146 | 126 |
| Code Completion | 130 | 128 |
| Code Refactoring | 144 | 127 |
| Bug Fixing | 155 | 130 |
| Unit Test Generation | 139 | 121 |
| Code Documentation | 133 | 126 |
| Regex Writing | 129 | 119 |
| CI/CD Pipelines | 131 | 117 |
| Frontend Component Design | 136 | 122 |
| Data Analysis | 150 | 124 |
| CSV / Spreadsheet Cleanup | 141 | 128 |
| ETL Scripting | 137 | 122 |
| JSON Extraction | 142 | 131 |
| Bulk Data Labeling | 133 | 129 |
| OCR / Document Parsing | 138 | 128 |
| Table Extraction from PDFs | 138 | 128 |
| Long-Document Summarization | 142 | 129 |
| Short-Form Summarization | 128 | 123 |
| Blog Post Writing | 129 | 119 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →