AI Hacking Agent Startup Tenzai Raises $75 Million

Team S · 2025-11-12T17:00:34.000Z

Tenzai, an Israel-based cybersecurity startup, emerged from stealth with a $75 million seed at a $330 million valuation, aiming to use AI agents (fine-tuned on Anthropic and OpenAI models) to autonomously find and exploit application vulnerabilities, then propose fixes for human review. Cofounders Pavel Gurvich and Ariel Zeitlin previously sold Guardicore to Akamai for $600 million; cofounders Ofri Ziv, Itamar Tal, and Aner Mazur (ex-Snyk) round out the team. Backers include Greylock, Lux, and Battery, with Greylock’s Asheem Chandna pegging the AI security testing market at $5 billion. Tenzai targets bespoke, critical apps for enterprises—competing more with consultancies like Deloitte and PwC than commodity tools—and enters a field with rivals like Terra Security and XBOW. Gurvich argues AI can uncover serious issues at scale; Anthropic reported its Sonnet 4.5 found new vulnerabilities in 33% of tested open-source tools.

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AI Hacking Agent Startup Tenzai Raises $75 Million | Newnex