Adaptive Security, a firm specialising in AI-powered social engineering prevention, has secured fresh investment, bringing its Series A round to $55m.
The investment was led by the OpenAI Startup Fund, which has made Adaptive its sole cybersecurity bet. This demonstrates the Fund’s confidence in the company’s human-focused approach to protection at a time when AI-enabled attacks are on the rise.
Founded to address the risks posed by AI-driven deception, Adaptive Security provides a platform designed to defend institutions and individuals against threats such as deepfake impersonation, AI-generated phishing, and synthetic voice scams. Its technology combines AI-based phishing simulations across voice, video, and messaging channels, along with personalised security awareness training, real-time reporting, and AI-driven risk scoring.
The additional funds will be used to accelerate the company’s product development and support its expansion as AI-driven attacks move rapidly from theoretical to real-world threats. Adaptive intends to continue innovating in deepfake detection and user-focused resilience training, positioning itself as a leading player in the fight against AI-enabled fraud.
Recent high-profile incidents have underlined the urgency of such defences. In June, US officials, including a member of Congress and a governor, were targeted by AI-generated messages impersonating Secretary of State Marco Rubio. That same month, OpenAI CEO Sam Altman warned at a Federal Reserve event that AI-based impersonation could spark a “fraud crisis” in the near future. Consumers have also been affected, with scams ranging from fake Ripple giveaways on X to FBI-reported voice-cloning frauds costing Michigan residents more than $240m in 2024.
Adaptive Security CEO Brian Long said, “Cybersecurity now begins with people, not just infrastructure. As AI becomes invisible infrastructure – embedded in how we shop, work, write, and think – it also enables deceptive attacks. Without upgrading how we train and protect individuals, we risk heading into a world where trust itself becomes our greatest vulnerability.”
OpenAI Startup Fund partner Ian Hathaway said, “Adaptive is moving with incredible product speed to build AI-native defenses for equally advanced threats. Their platform delivers exactly what modern security teams need — realistic deepfake simulations, AI-powered risk scoring, and training that resonates. We’re proud to back a team that’s reshaping how institutions stay resilient in the age of AI.”
Altman himself has also warned about the fragility of existing protections. Speaking in July, he said, “A thing that terrifies me is apparently there are still some financial institutions that will accept the voiceprint as authentication … That is a crazy thing to still be doing. AI has fully defeated most of the ways that people authenticate currently other than passwords.”
The latest backing builds on Adaptive Security’s original Series A round, extending its financial runway and signalling continued investor belief in its mission to redefine digital resilience against AI-enabled deception.
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