GPT-4o System Card

GPT-4V(ision) system card

GPT-5.4 Thinking System Card

GPT-5.5 System Card

GPT-5.3 Instant System Card

GPT-5.5 Instant System Card

OpenAI GPT-4.5 System Card

We’re releasing a research preview of OpenAI GPT‑4. 5, our largest and most knowledgeable model yet.

Addendum to GPT-4o System Card: 4o image generation

4o image generation is a new, significantly more capable image generation approach than our earlier DALL·E 3 series of models. It can create photorealistic output.

Addendum to GPT-5.2 System Card: GPT-5.2-Codex

GPT-5.1-Codex-Max System Card

This system card outlines the comprehensive safety measures implemented for GPT‑5. 1-CodexMax.

Addendum to OpenAI o3 and o4-mini system card: OpenAI o3 Operator

We are replacing the existing GPT-4o-based model for Operator with a version based on OpenAI o3. The API version will remain based on 4o.

Fine-tuning now available for GPT-4o

GPT-5 System Card

This GPT-5 system card explains how a unified model routing system powers fast and smart responses using gpt-5-main, gpt-5-thinking, and lightweight versions like gpt-5-thinking-nano, optimized for different tasks and developer use.