Seed 1.8 (251228) (ByteDance) API
About
Build advanced reasoning agents with Seed 1.8 (251228) (ByteDance), a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $0.25/1M input and $2.00/1M output tokens, native tool calling support. Access Seed 1.8 (251228) (ByteDance) via the LLM Gateway API with up to 256K output tokens.
Capabilities
Input Modalities
textimage
Output Modalities
text
Reasoning
Yes
Limits
Context Window
256K
Tokens
Input Limit
256K
Tokens
Max Output
256K
Tokens
Pricing
Standard (per 1M tokens)
Input
$0.25
Output
$2.00
Caching (per 1M tokens)
Read
$0.05
Frequently Asked Questions
Seed 1.8 (251228) (ByteDance) by LLM Gateway costs $0.25 per 1M input tokens and $2.00 per 1M output tokens. Cached reads cost $0.05 per 1M tokens.
Model Details
ID
bytedance/seed-1-8-251228
Provider
LLM GatewayFamily
seed
Release Date
Dec 18, 2025
Knowledge Cutoff
N/A
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
LLMGATEWAY_API_KEY
API Base URL
https://api.llmgateway.io/v1