ByteDance: Doubao-Seed-2.1-Pro
doubao-seed-2.1-pro- Input / Output
- $0.8824 / $4.41
- Context
- 256K
- Max output
- 256K
- Modalities
- VisionChat
- Capabilities
- Tool usePrompt CacheReasoning
About Doubao-Seed-2.1-Pro
Doubao-Seed-2.1-Pro is the flagship of ByteDance's Seed 2.1 generation, announced in June 2026 as an agent for real-world productivity across office work, coding and creative tasks. ByteDance emphasises coding delivery, long multi-step agent tasks and multimodal understanding, including hour-long video. It takes text and images, with reasoning and tool calling.
Where it works well
- Built for agent execution: multi-step jobs such as project planning and file processing, which ByteDance lists as core capabilities.
- Covers the coding cycle of architecture, implementation, debugging and validation in one model, according to ByteDance.
- ByteDance reports WorldVQA 53.0 and ERQA 72.0 on its Seed2.1 page, covering world knowledge and spatial reasoning.
- Context and output room are large and tool calling and prompt caching are supported.
When to choose another model
- Schema-enforced JSON output is not available, so Seed 2.1 Turbo is the choice when schema-bound output is required.
- ByteDance gives Pro the highest quality in the family, but Turbo is meant for scaled, cheaper production traffic.
- Video understanding is a described strength of the family, but video input is not accepted; send key frames as images.
Getting started
Create API key
Create a key in Console, then use it with every model on the platform.
Send your first request
Copy the example for your language and run it against the endpoint.
Text to textResponses APIPOST/v1/responsesAPI format:curl https://api.tokenlab.sh/v1/responses \ -H "Content-Type: application/json" \ -H "Authorization: Bearer sk-xxx" \ -d '{ "model": "doubao-seed-2.1-pro", "input": "Hello!" }'
Pricing
The Verified price applies to Verified, which costs less on most models. The Official price is the model maker's published price and applies to the more reliable Official route. Auto bills the route that completes the request.
Input tokens <= 256K · Text to text
per 1M tokens- Official price
- Input $0.8824 / Output $4.41 / Cache read $0.1765
- Verified price
- —
- Discount
- —
Cache read
- Official price
- $0.1765
- Verified price
- —
- Discount
- —
| Official priceper 1M tokens | Verified priceper 1M tokens | Discount | |
|---|---|---|---|
| Input tokens <= 256K · Text to text | Input $0.8824 / Output $4.41 / Cache read $0.1765 | — | — |
| Prompt cache pricing | |||
| Cache read | $0.1765 | — | — |
Usage & activity
Success rate is the share of requests that completed. Latency is how long a full response takes; P95 means 95% of requests finished within that time.
Usage & availability
Last 24 hours- Requests
- Success rate
- P95 latency
- Total tokens
Data is based on aggregate user requests, excluding status checks.
Open in Console
Open Doubao-Seed-2.1-Pro in Console with a prompt ready to edit or send.
Help me try doubao-seed-2.1-pro with a short message at /v1/responses. Show the reply, latency, and cost.
Use cases
Best for- Reasoning
- Vision
Software delivery agents
Hand it a feature request and let it design, implement, debug and validate across a repository using tool calls.
Office automation
Plan a project, process a folder of files and produce a summary or spreadsheet with a chain of tool calls.
Spatial and visual QA
Ask questions about floor plans, maps or product photos where position and layout matter.
Hard-case escalation
Send the requests that Turbo fails on to Pro so most traffic stays on the lighter model.
Prompt examples
Add pagination to our API and its React client, update the tests, run them with the shell tool, and fix any failures before you report back.
The attached image is a floor plan. Which rooms have a window on the south wall, and how would furniture fit in the largest bedroom?
Process these twelve meeting notes, extract action items per person, and draft a one-page project plan with dates.
This model has conditional pricing. Monthly token totals alone cannot produce a reliable estimate; use the detailed pricing for the request specification, cache, and applicable time window.
FAQ
What exactly is Doubao-Seed-2.1-Pro?
It is ByteDance's flagship Seed 2.1 model, unveiled at the Volcano Engine FORCE conference in June 2026. ByteDance presents it as a next-generation agent for real-world productivity, with strength in coding and multimodal understanding.
How is Seed 2.1 Pro different from Seed 2.1 Turbo?
Pro is the larger, more capable model for complex tasks; Turbo is the smaller one for scaled production. ByteDance says Pro generally scores higher, while Turbo stays competitive. Turbo also supports JSON schema output.
Is it better than Seed 2.0 Pro?
ByteDance positions Seed 2.1 as an upgrade in coding delivery, long agent tasks and multimodal understanding. Prompts tuned on 2.0 Pro should be re-tested, since behaviour can differ between generations.
Does it accept video?
Not as direct input. ByteDance describes hour-long video understanding for Seed 2.1, but this model takes text and images, so send key frames as images.
Does it support tool calling?
Yes. Tool calling, reasoning and prompt caching are all supported, so it can drive agent loops that read files, run commands and act on the results.
How much does Doubao-Seed-2.1-Pro cost?
On TokenLab, Doubao-Seed-2.1-Pro costs Input $0.8824 / Output $4.41 per 1M tokens. The pricing table above shows the full breakdown. Rates depend on the billing unit, specification, and usage. Compare matching conditions in the model's detailed pricing; a single rate does not determine the total cost.
What are the context window and output limit of Doubao-Seed-2.1-Pro?
Doubao-Seed-2.1-Pro accepts up to 262,144 tokens of context and returns up to 262,144 tokens in one response.
Which endpoint should Doubao-Seed-2.1-Pro use?
Use https://api.tokenlab.sh/v1/responses for Doubao-Seed-2.1-Pro. The request example below shows the matching code shape.
Which operations does Doubao-Seed-2.1-Pro support?
Doubao-Seed-2.1-Pro supports Text to text. Select an operation above to see its endpoint and request example.
Compare Doubao-Seed-2.1-Pro
Sources
Reviewed Oct 2, 2026
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