Introducing OpenAI Japan

OpenAI GPT-4.5 System Card

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

Welcome GPT OSS, the new open-source model family from OpenAI!

Introducing GPT-5.4

Introducing GPT-5. 4, OpenAI’s most most capable and efficient frontier model for professional work, with state-of-the-art coding, computer use, tool search, and 1M-token context.

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.

OpenAI helps Hyatt advance AI among colleagues

Hyatt deploys ChatGPT Enterprise across its global workforce, using GPT-5. 4 and Codex to improve productivity, operations, and guest experiences.

Previewing GPT-5.6 Sol: a next-generation model

OpenAI previews GPT-5. 6 Sol, a next-generation model with stronger capabilities in coding, science, and cybersecurity, paired with its most advanced safety stack.

Polimill builds Japan's next-generation public AI infrastructure

Polimill is developing Japan's next-generation public AI infrastructure by leveraging OpenAI GPT models and Codex. The platform assists municipalities in searching and utilizing administrative knowledge, thereby accelerating local development initiatives. By integrating advanced AI tools, Polimill aims to streamline public sector operations and enhance decision‑making processes.

Introducing OpenAI London

We are excited to announce OpenAI’s first international expansion with a new office in London, United Kingdom.

Introducing OpenAI o1

Introducing GPT-5.2

GPT-5. 2 is our most advanced frontier model for everyday professional work, with state-of-the-art reasoning, long-context understanding, coding, and vision.

OpenAI Japan announces Japan Teen Safety Blueprint to put teen safety first

OpenAI Japan announces the Japan Teen Safety Blueprint, introducing stronger age protections, parental controls, and well-being safeguards for teens using generative AI.

OpenAI Codex

We’ve created an improved version of OpenAI Codex, our AI system that translates natural language to code, and we are releasing it through our API in private beta starting today.