The cybersecurity landscape shifted dramatically in 2026. With the launch of Claude Code Security in February and the subsequent release of Claude Mythos Preview through Project Glasswing, AI-powered security is no longer a luxury reserved for enterprise teams with eight-figure budgets.

For startup security teams — often a single overworked engineer or a small group managing compliance, code review, vendor risk, and incident response simultaneously — Claude has become an indispensable force multiplier. Whether you’re building in stealth or scaling through Series B, here are the five highest-impact ways startup cybersecurity teams are putting Claude to work right now.