GPT-5.5 model releases

A source-backed timeline for the GPT-5.5 model family, collecting release dates, labs, access details, context windows, and major lifecycle changes.

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May 7, 2026

GPT-5.5-Cyber

OpenAI

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GPT-5.5-Cyber

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OpenAIFrontierProprietary

OpenAI's limited-preview cybersecurity model for vetted defenders in Trusted Access for Cyber. It is tuned for more permissive authorized security workflows such as vulnerability triage, patch validation, malware analysis, red teaming, and controlled exploit validation, but is not generally available.

—Undisc.— ctxMay 7, 2026