DeepSeek: DeepSeek V4.1 Flash vs ByteDance Seed: Seed 2.1 Turbo
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| DeepSeek: DeepSeek V4.1 Flash | ByteDance Seed: Seed 2.1 Turbo | |
|---|---|---|
| Vendor | deepseek | bytedance-seed |
| Quality Score | 100 | 100 |
| Input Price | $0.05/M | $0.50/M |
| Output Price | $0.57/M | $2.50/M |
| Context Window | 1,048,576 | 262,144 |
| Max Output | 943,718 | 235,929 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, DeepSeek V4.1 Flash costs $0.19 and Seed 2.1 Turbo costs $1.12, so DeepSeek V4.1 Flash is about 5.8 times cheaper for the same work.
DeepSeek V4.1 Flash reads up to 1,048,576 tokens at once, roughly 1,573 pages of text, against about 393 pages for Seed 2.1 Turbo.
Only Seed 2.1 Turbo offers video input.
Across the 18 tasks where they differ, DeepSeek V4.1 Flash scores higher on 18 (SQL Generation, Code Review, Code Completion and others).
DeepSeek V4.1 Flash was released in September 2026 and Seed 2.1 Turbo in August 2026.
Pick DeepSeek V4.1 Flash if you need lower cost, long documents or the stronger all-round task scores; pick Seed 2.1 Turbo if you need video input.
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 | DeepSeek: DeepSeek V4.1 Flash | ByteDance Seed: Seed 2.1 Turbo |
|---|---|---|
| SQL Generation | 133 | 130 |
| Code Review | 132 | 126 |
| Code Completion | 131 | 128 |
| Code Refactoring | 136 | 127 |
| Bug Fixing | 136 | 130 |
| Unit Test Generation | 124 | 121 |
| Code Documentation | 131 | 125 |
| Regex Writing | 119 | 119 |
| CI/CD Pipelines | 120 | 117 |
| CSV / Spreadsheet Cleanup | 133 | 128 |
| ETL Scripting | 128 | 122 |
| JSON Extraction | 131 | 131 |
| Bulk Data Labeling | 129 | 129 |
| OCR / Document Parsing | 131 | 128 |
| Table Extraction from PDFs | 131 | 128 |
| Long-Document Summarization | 137 | 129 |
| Short-Form Summarization | 123 | 123 |
| Blog Post Writing | 121 | 118 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →