GPT-OSS 120B
OpenAI's first open-weight reasoning model for teams wanting to run and customize models on their own infrastructure
GPT-OSS 120B
OpenAI • August 2025
Training Data
Up to August 2025
GPT-OSS 120B
August 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
Key Features
Capabilities
Other OpenAI Models
Explore more models from OpenAI
GPT-5.6 Sol
OpenAI's flagship GPT-5.6 model — its most capable system yet for complex coding, cybersecurity, and scientific reasoning, with new max reasoning effort and ultra subagent mode
GPT-5.6 Terra
The balanced mid-tier of the GPT-5.6 family — matches GPT-5.5 quality on high-volume business tasks at roughly half the price
GPT-5.6 Luna
The fastest, most cost-efficient GPT-5.6 model — strong everyday capability at OpenAI's lowest price for summarization, drafting, and routine automation
