Doubao Seed 2.1 Pro
Canonical page on the main site: sinoaihub.com/models/doubao-seed-2-1-pro
Type
model
Definition
Doubao Seed 2.1 Pro is a ByteDance model in the Doubao Seed family: 1,048,576-token context window; 262,144 max output; closed-weight; proprietary license; released 2026-09.
Key facts
- Context window: 1,048,576 tokens (max output 262,144)
- Weights: closed; proprietary license
- API pricing: $6.0 input / $30.0 output per 1M tokens (CNY)
- Released: 2026-09
- Capabilities: reasoning, vision, tool calling
Provider
Model Family
Doubao Seed
Version
260915
Aliases
- doubao-seed-2-1-pro-260915
- doubao-seed-2-1-pro-260628
Release Date
2026-09
Release History
| date | event | source | verification_date |
|---|---|---|---|
| 2026-06-23 | Doubao Seed 2.1 family released | https://seed.bytedance.com/en/blog/seed2-1-officially-released-advancing-ai-productivity | 2026-09-20 |
| 2026-09 | Seed 2.1 Pro with 1M-token context (version 260915) | https://docs.volcengine.com/docs/ark/model-release-announcement | 2026-09-20 |
Status
active
Context Window
1048576
Maximum Output
262144
Capabilities
- reasoning: Yes
- vision: Yes
- tool_calling: Yes
- structured_output: Yes
- agent_capability: Yes
- computer_use: Yes
Open Weight
No
License
proprietary
Self Hosting
No
Api Available
Yes
Pricing
- input_price_per_1m: 6.0
- output_price_per_1m: 30.0
- currency: CNY
- pricing_ref: bytedance
Official Api
Yes
Cloud Providers
- Volcengine Ark
Regions
- china
Benchmark Results
- Code Arena Frontend: 1539 (rank 8) (vendor_reported)
Related Technologies
Known Limitations
- Architecture and parameter counts are not publicly disclosed by ByteDance for the Seed 2.1 series (API-only model)
- API served from cn-beijing region only; no international endpoint verified as of 2026-09-20
- No open-weight release; no self-hosting
- Exact release day for the 260915 version not officially stated (month 2026-09 only)
Verification Status
partially_verified
Model Versions
| version | date | source | verification_date |
|---|---|---|---|
| 260628 | — | https://docs.volcengine.com/docs/ark/model-list?lang=zh | 2026-09-29 |
| 260915 | 2026-09 | https://docs.volcengine.com/docs/ark/model-release-announcement | 2026-09-29 |
License Changes
No documented license changes on record as of 2026-09-29.
Last Verified
2026-09-20
Sources
| evidence_id | source_name | source_url | source_type | published | verified | confidence | conflict |
|---|---|---|---|---|---|---|---|
| src-models-doubao-seed-2-1-pro-1 | Ark official model list | https://docs.volcengine.com/docs/ark/model-list?lang=zh | Official documentation | — | 2026-09-20 | high | — |
| src-models-doubao-seed-2-1-pro-2 | Ark official model pricing | https://docs.volcengine.com/docs/ark/model-pricing?lang=zh | Official documentation | — | 2026-09-20 | high | — |
| src-models-doubao-seed-2-1-pro-3 | Ark model release announcements | https://docs.volcengine.com/docs/ark/model-release-announcement | Official documentation | — | 2026-09-20 | high | — |
| src-models-doubao-seed-2-1-pro-4 | ByteDance Seed official blog — Seed 2.1 release | https://seed.bytedance.com/en/blog/seed2-1-officially-released-advancing-ai-productivity | Official | 2026-06-23 | 2026-09-20 | high | — |