SimSpace is the realistic cyber simulation infrastructure for continuously training, testing, and validating AI agents before they are deployed into production security environments. It recreates enterprise networks, cloud infrastructure, security tools, and attacker behavior so organizations can evaluate how AI agents detect threats, automate responses, and operate against real-world cyber scenarios in conditions that closely mirror live operations. By enabling AI agents to work together with human operators in an intelligent cyber range, SimSpace serves as the AI Proving Grounds for elite cyber teams. Security organizations use SimSpace to benchmark AI performance, validate agentic workflows, and ensure AI-driven detection and response systems are reliable, effective, and operationally ready before being deployed into real-world cybersecurity operations.