ByteDanceSeed 2.1

Seed 2.1 Pro

Seed 2.1 Pro is a general agent model for office work, code engineering and complex visual inputs. The family connects planning, file processing and tool use.

Technical guide

The release work covers full software tasks, including requirements, coding and debugging. Its visual examples include generating interactive pages from floor plans and design mockups.Seed 2.1 technical overview

Practical use

Practical guidance. For a long document task, test whether the model preserves the required facts after tool calls. A large input window alone does not prove that a final report used each source correctly.

Specifications & access

Seed 2.1 Pro specifications
DetailValue and conditions
AccessAPI
Model identifiersdoubao-seed-2-1-pro-260915doubao-seed-2-1-pro-260628
Current China release260915: 1,024K context; 256K maximum answer.Volcano Engine current model catalog
Earlier release260628 remains listed with 256K context.Volcano Engine current model catalog

Related models

  • Seed 2.1 model for agent workflows and multimodal understanding.

    Launch date not confirmedAPI
  • Multimodal Seed 2.1 model with a separate System One interface for fixed-choice probabilities and scores.

    Launch date not confirmedAPI