Try gpt oss · Guides · Model card · OpenAI blog Welcome to the gpt oss series, OpenAI’s open weight models designed for powerful reasoning, agentic tasks, and versatile developer use cases. We’re releasing two flavors of these open models: gpt oss 120b — for production, general purpose, high reasoning use cases that fit into a single H100 GPU (117B parameters with 5.1B active parameters) gpt oss 20b — for lower latency, and local or specialized use cases (21B parameters with 3.6B active parameters) Both models were trained on our harmony response format and should only be used with the harmony format as it will not work correctly otherwise. [!NOTE] This model card is dedicated to the larger gpt oss 120b model. Check out gpt oss 20b for the smaller model. Highlights Permissive Apache 2.0 license: Build freely without copyleft restrictions or patent risk—ideal for experimentation, customization, and commercial deployment. Configurable reasoning effort: Easily adjust the reasoning effort (low, medium, high) based on your specific use case and latency needs. Full chain of thought: Gain complete access to the model’s reasoning process, facilitating easier debugging and increased trust i…
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