Armadin said on Thursday that ​it raised $255.5 million in a Series B funding round, which values the AI cybersecurity company at more than $2.5 billion. 

Investors ‌have poured large ​sums into ​early-stage startups building defenses against AI-driven ​cyberattacks. 

Andreessen Horowitz and Accel co-led the round, joined by new investors Bain Capital Ventures and ​Redpoint as well as existing ‌backers, including Google Ventures, Kleiner Perkins, Menlo ​Ventures and In-Q-Tel.

 The round took total funding to $445 million, Armadin ‌said. 

The ​company will use ‌the money to scale ‌its platform, research, training and go-to-market efforts.

 ​Armadin uses a swarm of AI agents that act ​like hackers to find weaknesses.

 The company was founded ‌by CEO Kevin Mandia, who ‌also founded cybersecurity firm Mandiant and later sold it to Google.