OpenAI unveils GPT-5.4-Cyber in restricted rollout, a direct challenge to Claude Mythos
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OpenAI has introduced GPT-5.4-Cyber, a specialized AI model for cybersecurity tasks, in a limited rollout to verified professionals. The model is designed to be tested in controlled environments to identify vulnerabilities and improve its defenses before a wider release.
OpenAI has launched GPT-5.4-Cyber, a cybersecurity-focused AI model. It's available to a select group of cybersecurity professionals who will test its limits and identify potential vulnerabilities. The model is a fine-tuned version of OpenAI's GPT-5.4 large language model, designed for complex security-related queries. By simulating real-world attack scenarios, OpenAI aims to improve the model's resilience and defensive capabilities. This move comes amid competition with Anthropic, which recently introduced its Claude Mythos Preview model. OpenAI's approach focuses on targeted improvements, while Anthropic emphasizes a more foundational leap in AI-driven security.
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