MoonshotAI: Kimi K2.5 vs ByteDance Seed: Seed 1.6
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.
| MoonshotAI: Kimi K2.5 | ByteDance Seed: Seed 1.6 | |
|---|---|---|
| Vendor | moonshotai | bytedance-seed |
| Quality Score | 100 | 100 |
| Benchmark Score | 64.3 | - |
| Input Price | $0.53/M | $0.25/M |
| Output Price | $3.33/M | $2.00/M |
| Context Window | 262,144 | 262,144 |
| Max Output | 65,536 | 32,768 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
| Benchmark Scores | ||
| ai_index | 62.9 | - |
| eqbench | 55.2 | - |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, Seed 1.6 costs $0.75 and Kimi K2.5 costs $1.36, so Seed 1.6 is about 1.8 times cheaper for the same work.
Both read up to 262,144 tokens at once, roughly 393 pages of text.
Only Seed 1.6 offers video input.
Across the 20 tasks where they differ, Kimi K2.5 scores higher on 18 (SQL Generation, Code Review, Code Completion and others), Seed 1.6 on 2 (JSON Extraction, Bulk Data Labeling).
Kimi K2.5 was released in January 2026 and Seed 1.6 in December 2025.
Pick Kimi K2.5 if you need the stronger all-round task scores; pick Seed 1.6 if you need lower cost or 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 | MoonshotAI: Kimi K2.5 | ByteDance Seed: Seed 1.6 |
|---|---|---|
| SQL Generation | 142 | 131 |
| Code Review | 145 | 126 |
| Code Completion | 131 | 128 |
| Code Refactoring | 145 | 127 |
| Bug Fixing | 149 | 130 |
| Unit Test Generation | 132 | 121 |
| Code Documentation | 135 | 126 |
| Regex Writing | 127 | 119 |
| CI/CD Pipelines | 128 | 117 |
| Frontend Component Design | 131 | 122 |
| Data Analysis | 136 | 124 |
| CSV / Spreadsheet Cleanup | 133 | 128 |
| ETL Scripting | 136 | 122 |
| JSON Extraction | 131 | 131 |
| Bulk Data Labeling | 128 | 129 |
| OCR / Document Parsing | 133 | 128 |
| Table Extraction from PDFs | 133 | 128 |
| Long-Document Summarization | 146 | 129 |
| Short-Form Summarization | 127 | 123 |
| Blog Post Writing | 130 | 119 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →