Seed 1.8 API
About
Build advanced reasoning agents with Seed 1.8, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $0.12/1M input and $1.19/1M output tokens, native tool calling support. Access Seed 1.8 via the Volcengine Ark API with up to 64K output tokens.
Capabilities
Input Modalities
textimage
Output Modalities
text
Reasoning
Yes
Structured Output
Yes
Tool Use
Yes
WeightsClosed
Temperature
Adjustable
Attachment
Supported
Limits
Context Window
256K
Tokens
Input Limit
256K
Tokens
Max Output
64K
Tokens
Pricing
Standard (per 1M tokens)
Input
$0.12
Output
$1.19
Caching (per 1M tokens)
Read
$0.02
Frequently Asked Questions
Seed 1.8 by Volcengine Ark costs $0.12 per 1M input tokens and $1.19 per 1M output tokens. Cached reads cost $0.02 per 1M tokens.
Model Details
ID
doubao-seed-1-8-251228
Provider
Volcengine ArkFamily
seed
Release Date
Dec 28, 2025
Knowledge Cutoff
N/A
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
ARK_API_KEY
API Base URL
https://ark.cn-beijing.volces.com/api/v3