'Trusted access for the next era of cyber defense': OpenAI reveals its Mythos rival, designed for cybersecurity pros to spot the next level of attacks

Date:
Wed, 15 Apr 2026 09:50:47 +0000

Description:
As Mythos steals the limelight, OpenAI is releasing GPT-5.4-Cyber and is teasing even better models down the line.

FULL STORY ======================================================================Copy link Facebook X Whatsapp Reddit Pinterest Flipboard Threads Email Share this article 0 Join the conversation Follow us Add us as a preferred source on Google Newsletter Tech Radar Pro Are you a pro? Subscribe to our newsletter Sign up to the TechRadar Pro newsletter to get all the top news, opinion, features and guidance your business needs to succeed! Become a Member in Seconds Unlock instant access to exclusive member features. Contact me with news and offers from other Future brands Receive email from us on behalf of our trusted partners or sponsors By submitting your information you agree to the Terms & Conditions and Privacy Policy and are aged 16 or over. You are
now subscribed Your newsletter sign-up was successful Join the club Get full access to premium articles, exclusive features and a growing list of member rewards. Explore An account already exists for this email address, please log in. Subscribe to our newsletter OpenAI launches GPT5.4Cyber, a cyberdefense variant of GPT5.4 Model adds reverse engineering and lower refusal boundaries for defenders Available via Trusted Access for Cyber program, scaled to thousands of verified users The AI-powered cybersecurity race has reached a new level after OpenAI announced a new model to rival Anthropic Mythos .

The company revealed the launch of GPT-5.4-Cyber , a modified version of the GPT-5.4 model designed for cybersecurity defense operations. The main difference is lower refusal boundaries for legitimate cybersecurity tasks, which OpenAI describes as the tool being more cyber-permissive. The model now comes with binary reverse engineering capabilities, allowing analysts to hunt for malicious code in programs and apps. Article continues below You may like Project Glasswing wants to use AI to prevent AI cyberattacks OpenAI releases Codex Security to spot the next big cyber risks to your company, promises to 'identify complex vulnerabilities that other agentic tools miss' AI powers innovation but its also powering the next wave of cyber attacks TIered
system and new announcements OpenAI is seemingly trying to frame Mythos limited access as a disadvantage, promising a more democratized solution instead - and while GPT-5.4-Cyber will be more open than Mythos, it still
wont be available to anyone.

The tool will still only be available to members of the Trusted Access for Cyber (TAC) program, but OpenAI said it is now scaling it to thousands of verified individual defenders and hundreds of teams responsible for defending critical software."

The program will now have a tiered verification system, with the highest tier unlocking GPT-5.4-Cyber. Those interested in partaking in TAC can go to chatgpt.com/cyber, while enterprises are advised to reach out to their OpenAI representative. Those who are already part of the program can apply for
higher tiers, as well.

OpenAI also said the release is in preparation of an even more capable AI model , due later this year. In preparation for increasingly more capable models from OpenAI over the next few months, we are fine-tuning our models specifically to enable defensive cybersecurity use cases, starting today with a variant of GPT5.4 trained to be cyber-permissive: GPT5.4Cyber, the announcement said. Are you a pro? Subscribe to our newsletter Sign up to the TechRadar Pro newsletter to get all the top news, opinion, features and guidance your business needs to succeed! Contact me with news and offers from other Future brands Receive email from us on behalf of our trusted partners
or sponsors By submitting your information you agree to the Terms &
Conditions and Privacy Policy and are aged 16 or over.

Mythos is an AI model allegedly so powerful that Antrhopic only gave it to a handful of the biggest software companies, such as Microsoft , Apple , and Google . The tool, they claim, was able to find decades-old vulnerabilities with ease which could, in the wrong hands, be catastrophic. The best
antivirus for all budgets Our top picks, based on real-world testing and comparisons

Read our full guide to the best antivirus 1. Best overall: Bitdefender Total Security 2. Best for families: Norton 360 with LifeLock 3. Best for mobile: McAfee Mobile Security Follow TechRadar on Google News and add us as a preferred source to get our expert news, reviews, and opinion in your feeds. Make sure to click the Follow button!

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Link to news story: https://www.techradar.com/pro/security/trusted-access-for-the-next-era-of-cybe r-defense-openai-reveals-its-mythos-rival-designed-for-cybersecurity-pros-to-s pot-the-next-level-of-attacks


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