GPT-OSS 120B
OpenAI Released December 2025
OpenAI's first open-weight reasoning model for teams wanting to run and customize models on their own infrastructure
GPT-OSS 120B
OpenAI • December 2025
Training Data
Up to August 2025
GPT-OSS 120B
December 2025
Parameters
120 billion
Training Method
Open-weight Reasoning Training
Context Window
128,000 tokens
Knowledge Cutoff
August 2025
Key Features
Open Weights • Self-hosted • Customizable • Reasoning Focused
Capabilities
Reasoning: Excellent
Customization: Outstanding
Self-hosting: Outstanding
What's New in This Version
First open-weight reasoning model from OpenAI, designed for enterprise self-hosting
OpenAI's first open-weight reasoning model for teams wanting to run and customize models on their own infrastructure
What's New in This Version
First open-weight reasoning model from OpenAI, designed for enterprise self-hosting
Technical Specifications
Parameters 120 billion
Context Window 128,000 tokens
Training Method Open-weight Reasoning Training
Knowledge Cutoff August 2025
Training Data Up to August 2025
Key Features
Open Weights Self-hosted Customizable Reasoning Focused
Capabilities
Reasoning: Excellent
Customization: Outstanding
Self-hosting: Outstanding
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