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Models / Doubao Seed 2.1 Pro
Doubao Seed 2.1 Pro
Doubao Seed family · Provider: bytedance · Status: active · Released: 2026-09
Doubao Seed 2.1 Pro is a Doubao Seed model developed by bytedance, a Chinese AI company headquartered in No. 1 Building, Dazhongsi Plaza, No. 18A North Third Ring Road West, Haidian District, Beijing, China, released 2026-09 with a 1,048,576-token context window and closed weights.
| Key fact | Value |
|---|---|
| Model ID | doubao-seed-2-1-pro |
| Version | 260915 |
| Architecture | Not publicly disclosed |
| Context window | 1,048,576 tokens |
| Max output | 262,144 tokens |
| Open weights | No |
| License | proprietary |
| Self-hosting | No |
| API available | Yes |
| API pricing | $6 input / $30 output per 1M tokens (CNY) · provider pricing page |
| Regions | china |
| Cloud providers | Volcengine Ark |
Capabilities
| Capability | Supported |
|---|---|
| Reasoning | Yes |
| Coding | Unknown |
| Math | Unknown |
| Chinese | Unknown |
| English | Unknown |
| Multilingual | Unknown |
| Vision | Yes |
| Audio | Unknown |
| Video | Unknown |
| Tool calling | Yes |
| Function calling | Unknown |
| Structured output | Yes |
| Agent capability | Yes |
| RAG | Unknown |
| Computer use | Yes |
Benchmark results
| Benchmark | Version | Score | Metric | Date | Source type | Source |
|---|---|---|---|---|---|---|
| Code Arena Frontend | — | 1539 (rank 8) | arena score | 2026-06-23 | vendor_reported | link |
Benchmark scores are single data points, not universal rankings. Vendor-reported scores are labeled as such.
Known limitations
- 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)
Doubao Seed 2.1 Pro is ByteDance’s flagship text model, served through the Volcengine Ark API in the cn-beijing region. The 260915 version supports a 1M-token context window, which ByteDance positions for long-running agent tasks, asynchronous sub-task verification, multimodal understanding, deep research, tool execution, cross-application office workflows and coding.
The official model list documents deep thinking, text generation, multimodal understanding (image, video and PDF input), GUI task handling, tool calling and structured output (json_schema). As with all Doubao Seed API models, no downloadable weights are offered. API pricing is tiered in CNY per 1M tokens: 6.00 input / 30.00 output, with cache hits billed at 1.20 (as of 2026-09-20).
Provider
Pricing
Related models (same family)
API
Model family timeline
| Model | Released | Status |
|---|---|---|
| Doubao Seed 2.1 Turbo | 2026-06 | active |
| Doubao Seed Evolving | 2026-06 | active |
| Doubao Seed 2.1 Pro (this page) | 2026-09 | active |
Data interpretation
| Field | Value | Evidence type |
|---|---|---|
| Context window | 1,048,576 tokens | Official |
| Open weights | No | Official |
| License | proprietary | Official |
| API pricing | $6 / $30 per 1M tokens (CNY) | Official |
| Code Arena Frontend | 1539 (rank 8) arena score | Vendor-reported |
| Family position | 3 models in the Doubao Seed family | China AI Hub analysis |
Evidence types: Official = vendor documentation, pricing pages or model cards. Vendor-reported = benchmark scores published by the vendor. China AI Hub analysis = derived from the database itself. See the sourcing policy.
Sources
Confidence and source hierarchy per the sourcing policy. Facts change; check the source before relying on this page.
What is the context window of Doubao Seed 2.1 Pro?
Doubao Seed 2.1 Pro has a 1,048,576-token context window and a maximum output of 262,144 tokens.
Is Doubao Seed 2.1 Pro open weight?
No — Doubao Seed 2.1 Pro is not open weight.
How much does Doubao Seed 2.1 Pro cost through the API?
$6 per 1M input tokens and $30 per 1M output tokens (CNY).
Where does China AI Hub get its Doubao Seed 2.1 Pro data?
From 4 sources (official pages first), last verified 2026-09-20. Benchmark scores are labeled by source type; see the sourcing policy for details.