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AI news on December 22, 2025 · Monday

5 stories — deduplicated across sources, ranked by significance, every source cited.
★ Top story · OtherDec 22

Continuously hardening ChatGPT Atlas against prompt injection

OpenAI is strengthening ChatGPT Atlas against prompt injection attacks using automated red teaming trained with reinforcement learning. This proactive discover-and-patch loop helps identify novel exploits early and harden the browser agent’s defenses as AI becomes more agentic.