GPT-5.5-Cyber
GPT-5.5-Cyber is an AI model released by OpenAI on Monday, Jun 22 2026, 60 days after GPT-5.5-Pro. Benchmark results (shown below) cover CyberGym.
Benchmarks
About GPT-5.5-Cyber
GPT-5.5-Cyber, announced June 22, 2026, was OpenAI's first cybersecurity-specialised model and the anchor of Daybreak, the vetted-access program for security defenders that OpenAI had introduced a month earlier. Trained to find, validate, and help patch software vulnerabilities across large codebases, it scored 85.6% on CyberGym at release, against the 81.8% posted by the general-purpose GPT-5.5.
The model never shipped to the public API — access ran through Daybreak's identity checks and monitoring, a template Google followed a month later with Gemini 3.5 Flash Cyber. Alongside the model, OpenAI and Trail of Bits launched Patch the Planet, which put the model to work on open-source projects including cURL and NATS Server. GPT-5.6-Cyber succeeded it in August 2026.
GPT-5.5-Cyber — frequently asked questions
- When was GPT-5.5-Cyber released?
- GPT-5.5-Cyber was released by OpenAI on Monday, Jun 22 2026.
- Who made GPT-5.5-Cyber?
- GPT-5.5-Cyber was built by OpenAI. Creators of ChatGPT and the GPT series of models. Pioneered large-scale language model research.
- What benchmark scores did GPT-5.5-Cyber get?
- GPT-5.5-Cyber reports 1 tracked benchmark score — CyberGym: 85.6%. Scores are the figures published at release by OpenAI. It holds the best score among all models tracked here on CyberGym.
- Is GPT-5.5-Cyber open source?
- No. GPT-5.5-Cyber is a proprietary model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.
- What came before and after GPT-5.5-Cyber?
- OpenAI's previous tracked release was GPT-5.5-Pro on Apr 23 2026, 60 days earlier. It was followed by GPT-5.6 Sol on Jun 26 2026.