Seed 1.8 (251228) API
About
Build advanced reasoning agents with Seed 1.8 (251228), 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, open weights architecture. Access Seed 1.8 (251228) via the DevPass (LLM Gateway) API with up to 8K output tokens.
Capabilities
Input Modalities
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Output Modalities
text
Reasoning
Yes
Limits
Context Window
256K
Tokens
Input Limit
256K
Tokens
Max Output
8K
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) by DevPass (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
seed-1-8-251228
Provider
DevPass (LLM Gateway)Family
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