OpenAI Introduces a Rival to Mythos and Three Voice Models

OpenAI unveils GPT-5.5-Cyber for cybersecurity, alongside three new voice models.

OpenAI has unveiled GPT-5.5-Cyber, a modification of its flagship AI model tailored for cybersecurity tasks. It is available to a limited group of developers.

The neural network is not designed for significant expansion of capabilities in the digital environment; rather, it has been trained for more flexible handling of security tasks: identifying and classifying vulnerabilities, verifying fixes, and analyzing malware.

“GPT‑5.5‑Cyber will allow a limited group of partners to explore complex workflows where access specificity matters,” the startup’s blog states.

The release by OpenAI comes a month after the launch of Mythos, an AI model from Anthropic that garnered significant attention for its cybersecurity capabilities. The firm refrained from releasing the neural network to the public due to high security risks. Instead, it introduced Project Glasswing, an initiative for testing the tool in secure conditions.

In April, OpenAI released GPT-5.4-Cyber in response, aimed at finding vulnerabilities as part of the Trusted Access for Cyber program launched in February.

Voice Models

The company did not stop there. OpenAI introduced three voice models:

• GPT‑Realtime‑2 — the first neural network with GPT‑5-level logical reasoning capabilities. It can handle more complex queries and engage in natural conversation;
• GPT‑Realtime‑Translate — an LLM for simultaneous translation, keeping pace with the speaker’s speech;
• GPT‑Realtime‑Whisper — a streaming system for real-time speech-to-text conversion.

Introducing GPT-Realtime-2 in the API: our most intelligent voice model yet, bringing GPT-5-class reasoning to voice agents.

Voice agents are now real-time collaborators that can listen, reason, and solve complex problems as conversations unfold.

Now available in the API… pic.twitter.com/2DY1LU2vO8

— OpenAI (@OpenAI) May 7, 2026

GPT‑Realtime‑2 offers five levels of reasoning: minimal, low, medium, high, and very high. The context window has been expanded from 32,000 to 128,000 tokens.

GPT‑Realtime‑Translate translates live speech from over 70 languages into 13. The context window is 16,000 tokens.

GPT‑Realtime‑Whisper can create subtitles during meetings, conferences, lessons, broadcasts, and also generate notes and summaries during or immediately after conversations.

The models are available in the Realtime API.

Codex Extension for Chrome

OpenAI has released a Codex extension for the Chrome browser on macOS and Windows. The tool interacts with applications and websites and operates in parallel across all tabs in the background.

Codex now works directly in Chrome on macOS and Windows.

It’s even better at working with apps and sites in Chrome, and now works in parallel across tabs in the background without taking over your browser.

To get started, install the Chrome plugin in the Codex app. pic.twitter.com/pjtHd9gC69

— OpenAI (@OpenAI) May 7, 2026

“Codex can quickly handle routine tasks in the browser such as navigating structured pages and performing complex data entry processes,” the announcement states.

At each stage of task execution, the model independently selects the most suitable tool.

Emergency Contact in ChatGPT

OpenAI has added an “Emergency Contact” feature to ChatGPT. It allows a user (or a parent in a child’s account) to designate a contact person for emergencies.

If the company’s “trained specialists” detect that a user has been asking questions about self-harm, the trusted contact will receive a notification. The method of contact can be chosen — messenger, email, or another ChatGPT account.

Back in September 2025, OpenAI implemented parental controls in the chatbot.