DeepSeek Banned From U.S. Federal Agencies: Who It Affects and What to Use Instead
Short answer: The Department of Homeland Security ordered federal civilian agencies to stop buying DeepSeek products and to remove them, including third-party products built using DeepSeek implementations, from their IT. Private companies are not directly restricted, but software vendors to civilian agencies are affected. At list prices, GPT-5 nano and GPT-6 Luna cost less than DeepSeek V4.1 Flash on a typical workload. Federal Register notice 2026-21447, filed on October 19, 2026, and published
🎯 Vulnerability: Web Security Vulnerability
💡 Defense Fix: Implement strict input validation, contextual output encoding, and enforce least-privilege authorization controls.