When OpenAI released ChatGPT, I was among the millions captivated by what we (humanity) achieved. Truly honored to join the mission to accelerate human progress safely @OpenAI Preparedness and stand on the shoulder of giants at a pivotal moment for agentic security.

new shai hulud wave. interestingly it has this inside the payload to trigger safety refusals in potential defensive scans.

theUSshould lead on AI by continuing to develop the very best models, making sure they're safe, and getting cyber tools into the hands of trusted defenders. the new EO gets the balance right.

Today, we’re sharing that a general-purpose internal @openai model achieved a breakthrough on one of the best-known combinatorial geometry problems. Less than 1 year ago frontier AI models were at IMO gold-level performance. I expect this pace of progress to continue.

6-8 months before distilled open weight models catch up.

The security industry is entering a period of compression. Model cybersecurity capabilities are rapidly increasing, and it's critical we arm defenders with the tools they need to protect what matters most. We're launching two models today: GPT-5.5 with TAC (Trusted Access for Cyber) GPT-5.5-Cyber (Limited Preview) GPT-5.5 is our starting point for most defensive workflows. It's exceedingly good at cybersecurity workflows and tasks like secure code review, vulnerability triage, detection engineering, malware analysis, and patch validation. We think this model is the right starting place for most organizations. GPT-5.5-Cyber is exceptional for authorized workflows, including red teaming, penetration testing, and controlled validation. It's in research preview for specific organizations and requires enhanced verification and account-level controls. We expect to continue to accelerate defenders with various models, including both our flagship models through Trusted Access for Cyber, and with dedicated cyber models like GPT‑5.5‑Cyber and even more cyber-capable models in the future. openai.com/index/gpt-5-5-wit…

OpenAI’s GPT-5.5 is the second model to complete one of our multi-step cyber-attack simulations end-to-end 🧵

We've released a new 5-point action plan for strengthening cyber defense. AI is reshaping cybersecurity. The same capabilities that help defenders may be used by malicious actors. One approach is to treat these systems as too dangerous for broad defensive use and limit them to a very small number of approved partners. We think that misses the central challenge. Attackers won’t wait. Existing models are already useful for many cyber workflows and capabilities will keep advancing. Criminal groups will adopt whatever tools are available. The best way to reduce national risk is to responsibly equip and accelerate trusted defenders faster than adversaries can adapt. Check out our plan ⬇️ openai.com/index/cybersecuri…

The amount of squabbling over bugs, bug quality, AI bug extermination, how security is doomed/not doomed/unchanged/improved based on bugs… it’s ridiculous. Bugs are not the totality of cybersecurity.

The biggest opportunity for would-be startup founders is AI. But the most underpriced opportunity is probably non-AI ideas. So if you have a good non-AI idea, go for it, because everyone else is going to overlook it.

The U.S. has evidence that foreign entities, primarily in China, are running industrial-scale distillation campaigns to steal American AI. We will be taking action to protect American innovation. These foreign entities are using tens of thousands of proxies and jailbreaking techniques in coordinated campaigns to systematically extract American breakthroughs. Foreign entities who build on such fragile foundations should have little confidence in the integrity and reliability of the models they produce. The U.S. government is committed to the free and fair development of AI technologies across a competitive ecosystem, from open-source to proprietary models. Read the memo: whitehouse.gov/wp-content/up…

Anthropic’s Mythos raised the bar for AI vuln detection but kept it invite-only. GPT-5.5 is OpenAI’s answer, and it’s open to all. We had early access. Ran the benchmarks. Blackbox GPT-5.5 already beats whitebox GPT-5. Best pentesting model we’ve tested. Read our analysis: bit.ly/48OX7v6

Introducing GPT-5.5 A new class of intelligence for real work and powering agents, built to understand complex goals, use tools, check its work, and carry more tasks through to completion. It marks a new way of getting computer work done. Now available in ChatGPT and Codex.

We’re expanding Trusted Access for Cyber with additional tiers for authenticated cybersecurity defenders. Customers in the highest tiers can request access to GPT-5.4-Cyber, a version of GPT-5.4 fine-tuned for cybersecurity use cases, enabling more advanced defensive workflows. openai.com/index/scaling-tru…

Intel SGX has fallen! Its most important key is in our hands: we extracted the Global Wrapping Key from an instance of the Intel Gemini Lake platform