head-to-head

Qwen: Qwen3.5 Plus 2026-04-20 vs ByteDance Seed: Seed-2.0-Lite

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.

The verdict

For a sample job of 1 million input tokens and 250,000 output tokens, both cost $0.75 at current list prices.

Qwen3.5 Plus 2026-04-20 reads up to 1,000,000 tokens at once, roughly 1,500 pages of text, against about 393 pages for Seed-2.0-Lite.

Across the 17 tasks where they differ, Qwen3.5 Plus 2026-04-20 scores higher on 17 (SQL Generation, Code Review, Code Completion and others).

Qwen3.5 Plus 2026-04-20 was released in April 2026 and Seed-2.0-Lite in March 2026.

Pick Qwen3.5 Plus 2026-04-20 if you need long documents 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.

Task	Qwen: Qwen3.5 Plus 2026-04-20	ByteDance Seed: Seed-2.0-Lite
SQL Generation	133	131
Code Review	132	126
Code Completion	131	128
Code Refactoring	136	127
Bug Fixing	136	130
Unit Test Generation	124	121
Code Documentation	131	126
Regex Writing	119	119
CI/CD Pipelines	120	117
CSV / Spreadsheet Cleanup	133	128
ETL Scripting	128	122
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	119

Scores reflect capability match + benchmark data + pricing for each task. Methodology →