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Step 5 Preview
Seed2.1 Pro Preview
Seed2.1 Pro Preview is a proprietary model from ByteDance.
- Developer
- ByteDance Seed
- Released
- —
- Context window
- —
- Price in / out, per 1M tokens
- —
- Weights
- Proprietary
- Inputs
- —
- Reasoning
- —
- Tool use
- —
LMArena, by category
| Leaderboard | Rating | Rank | Votes |
|---|---|---|---|
| WebDevLMArena | 1520 | 56 / 124 | 15.5K |
LMArena, CC BY 4.0, as of Oct 22, 2026. Where a model is rated at several effort levels, its best is shown.
Compare Seed2.1 Pro Preview
ByteDance Seed
ByteDance’s Seed team builds foundation models for text, code and media. Founded 2023 (Seed), based in Beijing. seed.bytedance.com
Questions
Who makes Seed2.1 Pro Preview?
Seed2.1 Pro Preview is made by ByteDance Seed, founded 2023 (Seed) and based in Beijing.
Is Seed2.1 Pro Preview open source?
No. Seed2.1 Pro Preview is proprietary and served through its provider’s API.