Inside GPT-5.5-Cyber: Capabilities, Refusals, and Federal Briefings Explained
Originally published on NextFuture OpenAI shipped GPT-5.5-Cyber to Trusted Access for Cyber (TAC) program participants in late April 2026 — exactly one week after Anthropic announced Mythos. Unlike standard GPT-5.5, this variant is fine-tuned on offensive and defensive security workflows, hardened a
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