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1. Harness engineering: leveraging Codex in an agent-first world

   By Ryan Lopopolo, Member of the Technical Staff

2. Bringing ChatGPT to GenAI.mil

   OpenAI for Government announces the deployment of a custom ChatGPT on GenAI.mil, bringing secure, safety-forward AI to U.S. defense teams.

3. Testing ads in ChatGPT

   OpenAI begins testing ads in ChatGPT to support free access, with clear labeling, answer independence, strong privacy protections, and user control.

4. Making AI work for everyone, everywhere: our approach to localization

   OpenAI shares its approach to AI localization, showing how globally shared frontier models can be adapted to local languages, laws, and cultures without compromising safety.

5. GPT-5 lowers the cost of cell-free protein synthesis

   An autonomous lab combining OpenAI’s GPT-5 with Ginkgo Bioworks’ cloud automation cut cell-free protein synthesis costs by 40% through closed-loop experimentation.

6. Introducing Trusted Access for Cyber

   OpenAI introduces Trusted Access for Cyber, a trust-based framework that expands access to frontier cyber capabilities while strengthening safeguards against misuse.

7. Introducing OpenAI Frontier

   OpenAI Frontier is an enterprise platform for building, deploying, and managing AI agents with shared context, onboarding, permissions, and governance.

8. Navigating health questions with ChatGPT

   A family shares how ChatGPT helped them prepare for critical cancer treatment decisions for their son alongside expert guidance from his doctors.

9. GPT-5.3-Codex System Card

   GPT‑5.3-Codex is the most capable agentic coding model to date, combining the frontier coding performance of GPT‑5.2-Codex with the reasoning and professional knowledge capabilities of GPT‑5.2.

10. Introducing GPT-5.3-Codex

    GPT-5.3-Codex is a Codex-native agent that pairs frontier coding performance with general reasoning to support long-horizon, real-world technical work.