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%. Tracked scores may come from lab reports or independent benchmarks; source details accompany the benchmark data.

Is GPT-5.5-Cyber open source?

No. GPT-5.5-Cyber is a closed 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.

GPT-5.5-Cyber

Released Jun 22 2026

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

CyberGym

85.6%

#3 of 13

Compare GPT-5.5-Cyber with

GPT-5.5-Cyber

Suggested comparisons

GPT-5.5-CybervsGPT-6 Sol GPT-5.5-CybervsClaude Opus 5.5 GPT-5.5-CybervsGemini 3.8 Flash GPT-5.5-CybervsMuse Spark 1.3 GPT-5.5-CybervsGrok 4.7 GPT-5.5-CybervsDeepSeek-V4.1-Flash GPT-5.5-CybervsMistral Medium 3.5 GPT-5.5-CybervsKimi K3 GPT-5.5-CybervsGLM-5.3-Flash GPT-5.5-CybervsQwen3.8-Max-0902 GPT-5.5-CybervsNemotron 3.5 Lightning

About

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.

Frequently asked questions

: GPT-5.5-Cyber was released by OpenAI on Monday, Jun 22 2026.
: GPT-5.5-Cyber was built by OpenAI. Creators of ChatGPT and the GPT series of models. Pioneered large-scale language model research.
: GPT-5.5-Cyber reports 1 tracked benchmark score — CyberGym: 85.6%. Tracked scores may come from lab reports or independent benchmarks; source details accompany the benchmark data.
: No. GPT-5.5-Cyber is a closed model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.
: 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.