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

Provider Baseten
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

Family Comparison: gpt-oss

ModelContextMax out
gpt-oss-120b-h100-throughput——
gpt-oss-120b131K131K
gpt-oss-20b131K131K

API

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

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
gpt-oss-20bupdate2b100acMar 23, 2026, 05:30 AM
parameters20
open_weightyes
modalitiesinput["text"]output["text"]
gpt-oss-20bupdate7a4f1f6Mar 22, 2026, 05:43 AM
model_typechat
gpt-oss-20bcreate7f5c66fMar 21, 2026, 05:16 AM