gpt-oss-20b

apache-2.020B

- Text in/text out only - Chat Completions API - Streaming - Function calling - Structured outputs - Reasoning - Available via managed compute and Foundry Local

Intelligence
Reasoning
Speed
Context
131K
Max output
131K

Capabilities

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

Details

Provider Azure AI Foundry
Creator OpenAI
Familygpt-oss
Licenseapache-2.0
Statusactive
Typechat
Input modalitiestext
Output modalitiestext
Open weightYes
Parameters20B
Architecture—
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-120b 1131K131K
gpt-oss-20b131K131K
gpt-oss——

API

GET/v1/models/azure/gpt-oss-20b

gpt-oss-20b

- Text in/text out only - Chat Completions API - Streaming - Function calling - Structured outputs - Reasoning - Available via managed compute and Foundry Local

Changes · 5 entries
gpt-oss-20bupdate1cd659eMar 24, 2026, 04:19 AM
capabilitiesjson modeyes
gpt-oss-20bupdate2b100acMar 23, 2026, 05:30 AM
parameters20
tools["function_calling"]
description- Text in/text out only - Chat Completions API - Streamin...
tagline- Text in/text out only - Chat Completions API - Streamin...
gpt-oss-20bupdate7a4f1f6Mar 22, 2026, 05:43 AM
model_typechat
gpt-oss-20bupdatec9a70c5Mar 21, 2026, 08:12 AM
knowledge_cutoffMay 31, 2024→2024-05-31
gpt-oss-20bcreate7f5c66fMar 21, 2026, 05:16 AM