Models / OpenAIGPT-OSS / / gpt-oss-120B API
gpt-oss-120B API

Enterprise-Ready Open Reasoning:
gpt-oss-120B delivers sophisticated chain-of-thought reasoning capabilities in a fully open model. Built with community feedback and released under Apache 2.0, this 120B parameter model provides transparency, customization, and deployment flexibility for organizations requiring complete data security & privacy control.
gpt-oss-120B API Usage
Endpoint
How to use gpt-oss-120B
Model details
Architecture Overview:
• Mixture-of-Experts (MoE) architecture with SwiGLU activations
• Alternating attention layers between full context and sliding 128-token window
• Learned attention sink per-head for enhanced performance
Training Methodology:
• Comprehensive safety training and evaluation protocols
• Community feedback integration from global listening sessions
• Rigorous testing under Preparedness Framework
• Standard GPT-4o tokenizer with additional Harmony format tokens
Performance Characteristics:
• Native FP4 quantization for efficient inference
• 128K context window with RoPE positional encoding
• Chain-of-thought reasoning with adjustable effort levels
Prompting gpt-oss-120B
Applications & Use Cases
Enterprise Applications:
• Complex reasoning and analysis tasks
• Research and development support
• Technical documentation generation
• Strategic planning and decision support
Developer Use Cases:
• Code generation and review
• API development and integration
• System architecture design
• Technical troubleshooting and debugging
Industry Solutions:
• Healthcare: Clinical decision support and medical research
• Finance: Risk analysis and regulatory compliance
• Legal: Contract analysis and legal research
• Education: Curriculum development and tutoring systems
Deployment Scenarios:
• On-premises infrastructure for data sovereignty
• Private cloud deployments for security compliance
• Custom fine-tuning for domain-specific applications
• Multi-modal integration with existing systems