Seed 2.1 Turbo API
About
Build advanced reasoning agents with Seed 2.1 Turbo, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers available completely free of charge, native tool calling support. Access Seed 2.1 Turbo via the Volcengine Ark Coding Plan API with up to 256K output tokens.
Capabilities
Input Modalities
textimagevideo
Output Modalities
text
Limits
Context Window
256K
Tokens
Input Limit
256K
Tokens
Max Output
256K
Tokens
Pricing
Standard (per 1M tokens)
Input
Free
Output
Free
Caching (per 1M tokens)
Read
Free
Frequently Asked Questions
Seed 2.1 Turbo by Volcengine Ark Coding Plan costs Free per 1M input tokens and Free per 1M output tokens. Cached reads cost Free per 1M tokens.
Model Details
ID
doubao-seed-2.1-turbo
Provider
Volcengine Ark Coding PlanFamily
seed
Release Date
Jun 23, 2026
Knowledge Cutoff
N/A
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
ARK_CODING_PLAN_API_KEY
API Base URL
https://ark.cn-beijing.volces.com/api/coding/v3