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 $0.03/1M input and $0.13/1M output tokens, native tool calling support, open weights architecture. Access GPT OSS 20B via the OpenRouter API with up to 118K output tokens.
Capabilities
Input Modalities
text
Output Modalities
text
Reasoning
Yes
Structured Output
Yes
Tool Use
Yes
WeightsOpen
Limits
Context Window
131K
Tokens
Input Limit
131K
Tokens
Max Output
118K
Tokens
Pricing
Standard (per 1M tokens)
Input
$0.03
Output
$0.13
Caching (per 1M tokens)
Read
$0.03
Frequently Asked Questions
GPT OSS 20B by OpenRouter costs $0.03 per 1M input tokens and $0.13 per 1M output tokens. Cached reads cost $0.03 per 1M tokens.
Model Details
ID
openai/gpt-oss-20b
Provider
OpenRouterFamily
gpt-oss
Release Date
Aug 5, 2025
Knowledge Cutoff
Jun 30, 2024
API Integration
NPM Package
@openrouter/ai-sdk-provider
Environment Variables
OPENROUTER_API_KEY
API Base URL
https://openrouter.ai/api/v1