Fortune reported Thursday, citing multiple sources familiar with the plans, that OpenAI is set to preview GPT-6 Cyber, a cybersecurity-focused model, within days — with its DevDay conference in San Francisco on Tuesday, September 29, as the likely stage. Reuters carried the report on September 24. A limited group of customers in the application-only Daybreak Red program already has access for alpha testing.

GPT-6 Cyber would be OpenAI's fourth security model of the year, following GPT-5.4 Cyber in April, GPT-5.5 Cyber in June, and GPT-5.6 Cyber in August. Alongside it, OpenAI plans a first-of-its-kind enterprise security platform — a gateway environment for building automated defenses and patching vulnerabilities, modeled on how ChatGPT serves as the consumer gateway to frontier models.

Coverage has intensified ahead of DevDay: TechGig and Forkast now report the Sept 29 preview as the working plan, with chief revenue officer Dali Rajic leading a commercial push behind the security line. One caution from The Hack Academy: OpenAI's official DevDay page confirms the event and a livestreamed keynote but says nothing about GPT-6 Cyber — so the preview date remains unconfirmed by OpenAI itself.

Resolved September 29: confirmed in substance. No 'GPT-6 Cyber' model was previewed, but the enterprise-security side landed hard: Codex Security Cloud (scheduled repo scanning with dedup and cloud-prepared fixes, Daybreak defensive models included) plus Private Intelligence — zero data retention with Private Safety Processing — and a Private Inference preview coming this fall.

Update (2026-10-08): Still unresolved: GPT-6 Cyber did not appear at DevDay 2026 (Oct 6). Fortune's later reporting said it is expected "within weeks, not days." DevDay's security announcement was Codex Security Cloud instead.

Update: DevDay 2026 (September 29) came and went with no GPT-6 Cyber preview and no enterprise security platform. OpenAI's developer event centered on Dots, Codex updates, the Pro 500 tier and the Decisions API. Marking this rumor debunked.