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    OpenAI's GPT-5.5 Matches Anthropic's Claude Mythos in Cybersecurity Evaluations

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    OpenAI's GPT-5.5 Matches Anthropic's Claude Mythos in Cybersecurity Evaluations

    Here's what it means for you.

    The emergence of advanced AI models like GPT-5.5 and Claude Mythos is reshaping cybersecurity strategies across industries.

    What happened

    GPT-5.5 has matched the performance of Claude Mythos in cybersecurity tests.

    The Context

    • GPT-5.5 is already available in ChatGPT and through API, while Claude Mythos is limited to a small group of users.
    • The evaluation indicates that advancements in AI models are part of a broader trend in AI capabilities.
    • The tests involved multi-step cyberattack simulations, showcasing the models' ability to handle complex scenarios.

    Takeaway

    The advancements in AI cybersecurity models suggest a growing reliance on AI for tackling complex cyber threats.

    This article was generated by AI from 3 verified sources and reviewed by A47 editorial systems.

    3 Articles
    Ars Technica — All

    GPT-5.5 matches heavily hyped Mythos Preview in new cybersecurity tests

    Recent cybersecurity tests indicate that OpenAI's GPT-5.5 has matched the performance of Anthropic's highly anticipated AI model, Mythos, suggesting that the cyber threat posed by Mythos is not unique to a single model.

    13 hours ago
    Read Full Article
    Ars Technica

    GPT-5.5 matches heavily hyped Mythos Preview in new cybersecurity tests

    Recent cybersecurity tests indicate that OpenAI's GPT-5.5 has matched the performance of Anthropic's highly anticipated AI model, Mythos, suggesting that the cyber threat posed by Mythos is not unique to a single model.

    13 hours ago
    Read Full Article
    THE DECODER

    GPT-5.5 matches Claude Mythos in cyber attack tests, UK AI Security Institute finds

    OpenAI's GPT-5.5 has been evaluated by the UK AI Security Institute and found to match the performance of Anthropic's Claude Mythos in cyber attack simulations, marking it as the second AI model capable of autonomously solving such complex scenarios.

    18 hours ago
    Read Full Article
    Techmeme

    Cybersecurity analysis: GPT-5.5 reaches a similar level of performance as Mythos Preview and is the second model to solve a multi-step cyberattack simulation (AI Security Institute)

    A recent evaluation by the AI Security Institute revealed that OpenAI's GPT-5.5 has achieved a performance level comparable to Anthropic's Mythos Preview, becoming the second AI model capable of solving a multi-step cyberattack simulation. This marks...