OpenAI Launches GPT-5.5-Cyber as Anthropic's Mythos Remains Offline

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OpenAI launched GPT-5.5-Cyber on June 22, and the model scored 85.6% on UC Berkeley's CyberGym benchmark. Anthropic's Mythos 5 scored 83.8% on the same leaderboard but remains offline after a U.S. emergency export control directive on June 12.
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