Seed 2.1 Pro
by ByteDance SeedChat
Flagship ByteDance Seed 2.1 model for complex multimodal reasoning, coding, and agents
- Context
- 256K tokens
- Max output
- 256,000 tokens
- Released
- 2026-06-23
- Weights
- Closed
bytedance-seed/seed-2-1-pro-260628 · also seen as doubao-seed-2-1-pro-260628
Specifications
Full facts as recorded, incl. what is unknown.
- Released
- 2026-06-23
- Weights
- Closed
- Input
- Text, Image, Video
- Output
- Text
- Context window
- 256,000 max across endpoints
- Max output
- 256,000
- Providers
- 1
- Epoch Capabilities Index
- not evaluated
- Direct price range
- $0.891 in · $4.45 out per 1M tokens · from its one provider
More details
- Last updated
- 2026-06-23
- Knowledge cutoff
Capabilities
Across all endpoints: supported if any endpoint supports it.
- Tool calling
- Parallel toolsunknown
- Structured output
- Reasoning
- Image input
- PDF input
- Audio input
- Audio outputunknown
- Video input
- Prompt caching
- Web searchunknown
- Computer useunknown
- System messagesunknown
- Assistant prefillunknown
- Temperature
- Streamingunknown
- Attachments
Endpoints
One row per provider and variant; gateways are listed separately.
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Price history
Atom feedNo change since 19 Oct 2026. The cheapest direct price has been $0.891 in / $4.45 out per 1M tokens at Volcengine Ark on every data refresh since then.
Tracked from 19 Oct 2026, the earliest refresh this model's headline price can be rebuilt from. Headline-eligible direct prices only, so a price the sanity check flags never draws a spike. Series as JSON
Cost calculator
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More from ByteDance Seed
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| Model | Released | Context | Listed price |
|---|---|---|---|
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| Seed Audio 1.0 | 2026-09-25 | — | unpriced |
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| Seedream 5.0 Pro | 2026-07-11 | — | unpriced |
| Seed 2.1 Turbo | 2026-06-23 | 262K | from $0.50 |
| Seed Evolving | 2026-06-23 | 256K | from $0.891 |
| Seed Character | 2026-06-23 | 256K | from $0.119 |
| Seed 2.1 Turbo | 2026-06-23 | 256K | from $0.445 |