OpenAI unveils GPT-5.4-Cyber a week after rival's announcement of AI model
Cristiana Gigina
April 14 : OpenAI on Tuesday unveiled GPT-5.4-Cyber, a variant of its latest flagship model fine-tuned specifically for defensive cybersecurity work, following rival Anthropic's announcement of frontier AI model Mythos. Mythos, announced on April 7, is being deployed as part of Anthropic's "Project Glasswing", a controlled initiative under which select organizations are permitted to use the unreleased Claude Mythos Preview model for defensive cybersecurity purposes. It has found "thousands" of
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