Cybersecurity AI (CAI) is a lightweight open-source framework that enables security professionals to build and deploy AI-powered offensive and defensive automation. It is the de facto framework for AI Security, used by thousands of individuals and hundreds of organizations. Supporting over 300 AI models like OpenAI, Anthropic, and Ollama, CAI offers built-in security tools, agent-based architecture, and guardrails for tasks like vulnerability discovery, exploitation, and assessment. Key features include modularity, real-time tracing, and Human-In-The-Loop (HITL) support for research, ethical hacking, and enterprise security.