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Anthropic launches Claude Mythos Preview — the first AI to autonomously exploit zero-day security vulnerabilities, released only under controlled access via Project Glasswing. OpenAI upgrades GPT-5.5 and GPT-5.5 Instant with higher accuracy and fewer hallucinations. Google unveils over 260 announcements at Cloud Next '26, including Gemma 4 and the 8th-generation TPU.