GPT-5.5 Instant System Card

GPT-5.5 Instant is OpenAI's latest fast-response AI model that uses safety methods similar to previous versions, but is the first Instant model classified as having high capability in cybersecurity and biological/chemical preparedness risks, so it has additional safeguards in place. The document clarifies naming conventions to avoid confusion: GPT-5.5 Instant (also called gpt-5.5-instant) should be compared to GPT-5.3 Instant, and the full GPT-5.5 model is referred to as GPT-5.5 Thinking.