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Security · 25 October 2026

OpenAI Resumes Frontier AI Training After Fixing Brotli Vulnerability

OpenAI resumed training its advanced AI models after strengthening security and fixing a Brotli flaw. The company disclosed the fix following earlier vulnerabilities highlighted by METR and Redwood Research.

Why it matters

OpenAI’s training pipeline is back online after a Brotli fix; anticipate accelerated model releases from competitors.

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