gpt-oss-20b

apache-2.020B

`gpt-oss-20b` is our medium-sized open-weight model for low latency, local, or specialized use-cases (21B parameters with 3.6B active parameters).

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

Model ID@cf/openai/gpt-oss-20b
Provider Cloudflare Workers AI
Creator OpenAI
Familygpt-oss
Licenseapache-2.0
Statusactive
Typechat
Input modalitiestext
Output modalitiestext
Open weight—
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——
gpt-oss-20b——

API

GET/v1/models/cloudflare-workers-ai/@cf/openai/gpt-oss-20b

gpt-oss-20b

@cf/openai/gpt-oss-20b

`gpt-oss-20b` is our medium-sized open-weight model for low latency, local, or specialized use-cases (21B parameters with 3.6B active parameters).

Changes · 3 entries
@cf/openai/gpt-oss-20bupdate655eec1Apr 16, 2026, 02:46 PM
capabilitiestool callyes
tools["function_calling"]
@cf/openai/gpt-oss-20bupdateb301ebeMar 23, 2026, 11:47 PM
modalitiesinput["text"]output["text"]
@cf/openai/gpt-oss-20bupdate2b100acMar 23, 2026, 05:30 AM
capabilitiesreasoningyes
model_typechat
parameters20
statusactive
page_urlhttps://developers.cloudflare.com/workers-ai/models/#gpt-...