GPT OSS 20B API
About
Build advanced reasoning agents with GPT OSS 20B, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $0.05/1M input and $0.20/1M output tokens, native tool calling support, open weights architecture. Access GPT OSS 20B via the FastRouter API with up to 66K output tokens.
Capabilities
Input Modalities
text
Output Modalities
text
Reasoning
Yes
Structured Output
No
Tool Use
Yes
WeightsOpen
Limits
Context Window
131K
Tokens
Input Limit
131K
Tokens
Max Output
66K
Tokens
Pricing
Standard (per 1M tokens)
Input
$0.05
Output
$0.20
Frequently Asked Questions
GPT OSS 20B by FastRouter costs $0.05 per 1M input tokens and $0.20 per 1M output tokens.
Model Details
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
FASTROUTER_API_KEY
API Base URL
https://go.fastrouter.ai/api/v1