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

gpt-oss-20b

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

Changes · 6 entries
openai/gpt-oss-20bupdateca7a400Nov 2, 2026, 03:02 AM
parameters22→21
openai/gpt-oss-20bupdatee3d7dedAug 31, 2026, 04:13 AM
parameters22→21
openai/gpt-oss-20bupdate1cd659eMar 24, 2026, 04:19 AM
capabilitiesfine tuningyes
openai/gpt-oss-20bupdateb301ebeMar 23, 2026, 11:47 PM
modalitiesinput["text"]output["text"]
openai/gpt-oss-20bupdate2b100acMar 23, 2026, 05:30 AM
capabilitiestool callyes
model_typechat
parameters22
page_urlhttps://huggingface.co/openai/gpt-oss-20b
descriptionWelcome to the gpt-oss series, [OpenAI’s open-weight mode...
release_date2025-08-04
context_window131072
licenseapache-2.0
taglineWelcome to the gpt-oss series, [OpenAI’s open-weight mode...
architecturemoe
open_weightyes
tools["function_calling"]
openai/gpt-oss-20bcreate7f5c66fMar 21, 2026, 05:16 AM