The document states that API access provides developers with direct access to gpt-5-thinking, gpt-5-thinking-mini, and gpt-5-thinking-nano, with the nano variant described as specifically designed for developer use cases.
This analysis describes what OpenAI's agreement states, permits, or reserves. It does not constitute a legal determination about enforceability. Regulatory applicability and practical outcomes may vary by jurisdiction, enforcement context, and individual circumstances. Read our methodology
This provision defines the model variants available to API developers, which determines the capability ceiling for applications built on the GPT-5 platform and establishes that the High capability bio/chem classification and safe-completions restrictions apply to the thinking model variants accessible via the API.
Interpretive note: The document does not detail what specific API usage restrictions, if any, are imposed by the High capability bio/chem classification on developer access to gpt-5-thinking variants, creating uncertainty about operational constraints for API users.
This provision establishes the specific model variants available to developers through the API, which governs the capabilities and associated safeguards, including safe-completions and the High bio/chem capability classification, that apply to applications built on gpt-5-thinking variants.
Cross-platform context
See how other platforms handle Developer API Access to Thinking Model Variants and similar clauses.
Compare across platforms →"In the API, we provide direct access to the thinking model, its mini version, and an even smaller and faster nano version of the thinking model, made for developers (gpt-5-thinking-nano).Excerpt from OpenAI's GPT-5 System Card
1) REGULATORY LANDSCAPE: API access to gpt-5-thinking, which carries the High capability bio/chem classification, may engage obligations under the EU AI Act for deployers who build products using this model, as deployer obligations under that …
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This provision defines the model variants available to API developers, which determines the capability ceiling for applications built on the GPT-5 platform and establishes that the High capability bio/chem classification and safe-completions restrictions apply to the thinking model variants accessible via the API.
This provision establishes the specific model variants available to developers through the API, which governs the capabilities and associated safeguards, including safe-completions and the High bio/chem capability classification, that apply to applications built on gpt-5-thinking variants.
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