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OpenAI Widens Access to Cybersecurity Model After Anthropic’s Mythos Reveal

·Source: SecurityWeek

Updated:

Executive Summary

GPT‑5.4‑Cyber is a model fine-tuned for defenders, lowering boundaries for legitimate cybersecurity work. The post OpenAI Widens Access to Cybersecurity Model After Anthropic’s Mythos Reveal appeared first on SecurityWeek .

Analysis

GPT‑5.4‑Cyber is a model fine-tuned for defenders, lowering boundaries for legitimate cybersecurity work. The post OpenAI Widens Access to Cybersecurity Model After Anthropic’s Mythos Reveal appeared first on SecurityWeek .
Source Attribution

Originally published by SecurityWeek on Apr 16, 2026.

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