gpt-oss-20b
Open Source
About
OpenAI open-weight model with 20 billion parameters. Lightweight, efficient text-only model with reasoning and function calling. Free for self-hosting. Released August 5, 2025.
Capabilities
MultimodalFunction CallingTool UseJSON Mode
Specifications
Released2025-08-05
Parameters20B
ArchitectureDecoder Only
Knowledge cutoff2025-08
Specializationgeneral