gpt-oss-20b

apache-2.021B

Welcome to the gpt-oss series, OpenAI’s open-weight models designed for powerful reasoning, agentic tasks, and versatile developer use cases.

Intelligence
Reasoning
Speed
Context
131K
Max output
131K

Capabilities

Reasoning & Interaction
Reasoning
Tool Calling
Output Control
Structured Output
JSON Mode
Infrastructure
Streaming
Batch Processing
Fine-tuning

Details

Provider Hugging Face
Creator OpenAI
Familygpt-oss
Licenseapache-2.0
Statusactive
Typechat
Input modalitiestext
Output modalitiestext
Open weightYes
Parameters21B
Architecturemoe
Context window131K tokens
Max input—
Max output131K tokens
Reasoning tokensYes
Knowledge cutoff
Release date
Sourceofficial

Tools

Function Callingfunction_calling
Call external functions and APIs

Family Comparison: gpt-oss

ModelContextMax out
gpt-oss-120b131K131K
gpt-oss-20b131K131K
gpt-oss-safeguard-20b131K—

API

GET/v1/models/huggingface/openai/gpt-oss-20b