# OpenAI GPT-5.5-Cyber — Security-Tuned Model in Limited Preview for Vetted Defenders

> OpenAI ships GPT-5.5-Cyber: a security-tuned preview model gated behind a Trusted Access program for verified defenders.

- Org: OpenAI
- Date: 2026-05-07
- Category: model, security
- Source: https://www.cnbc.com/2026/05/07/openai-rolls-out-new-gpt-5point5-cyber-to-vetted-cybersecurity-teams.html
- Canonical page: https://ai-tldr.dev/releases/openai-gpt-5-5-cyber/

## In short

OpenAI rolls out a security-tuned GPT-5.5 variant gated by a Trusted Access for Cyber program. Lower classifier refusals for authorized red-team, vulnerability triage, malware analysis, and detection-engineering work.

## What it is

GPT-5.5-Cyber is a tuned variant of GPT-5.5 with lower classifier-based refusals on cybersecurity-specific workflows. Access is limited to organizations vetted through OpenAI's new Trusted Access for Cyber program, with an initial focus on critical-infrastructure defenders. The base GPT-5.5 also got increased cyber safeguards in this same launch.

## How it works

Approved partners route requests through accounts flagged for Trusted Access. The classifier permits authorized work — vulnerability identification and triage, malware analysis, binary reverse engineering, detection engineering, patch validation, and red teaming — while still blocking categories OpenAI considers unsafe such as credential theft and writing malware. The UK AI Security Institute rated GPT-5.5 at parity with Anthropic's Mythos on its cyber tasks, completing a 32-step corporate-network simulation in 2 of 10 attempts versus Mythos's 3 of 10.

## Why it matters

Standard frontier models refuse much of the day-to-day work of a real red team — even on systems the operator owns. A vetted-only tier lets defenders pull GPT-5.5-class capability into pen-test, detection-engineering, and incident-response loops without prompt-engineering tricks. It also marks a more permissive stance than Anthropic's Mythos, which keeps cyber capability behind tighter rails.

## Who it's for

Verified internal security teams, MSSPs, and critical-infrastructure defenders

## Try it

Apply via OpenAI Trusted Access for Cyber

## Links

- [CNBC](https://www.cnbc.com/2026/05/07/openai-rolls-out-new-gpt-5point5-cyber-to-vetted-cybersecurity-teams.html)
- [Help Net Security](https://www.helpnetsecurity.com/2026/05/08/openai-gpt-5-5-cyber-model/)
- [SiliconAngle](https://siliconangle.com/2026/05/08/openai-introduces-gpt%E2%80%915-5%E2%80%91cyber-high-impact-cybersecurity-research/)
- [AISI Evaluation](https://www.aisi.gov.uk/blog/our-evaluation-of-openais-gpt-5-5-cyber-capabilities)