How much funding has Fabraix raised?

Fabraix has raised $500K in total funding, most recently a Pre-Seed round.

Who are Fabraix's investors?

Fabraix's investors include Y Combinator Continuity Fund, Byld Ventures.

Where is Fabraix headquartered?

Fabraix is headquartered in San Francisco, California, United States.

What industry is Fabraix in?

Fabraix operates in Artificial Intelligence, Cybersecurity.

Fabraix

Find vulnerabilities in your AI systems before users do.

San Francisco, United States · Founded 2026 · $500K raised

Artificial Intelligence

Cybersecurity

Headquarters: San Francisco, California
Employees: 1–10
Founded: 2026
Business Model: B2B

Website: fabraix.com
Total Funding: $500K
Last Round: $500K Pre-SeedJun 2026
Rounds: 1

About

Fabraix is a Y Combinator-backed (S26) AI security research lab that builds autonomous red-teaming agents to continuously find vulnerabilities in customer-facing AI systems. Its flagship product, Nyx, probes AI agents in pure blackbox mode — no source code access required — using a library of over 10,000 adaptive attack strategies that dynamically adjust based on the target agent's defenses, covering security, logic, and alignment failures across chat, voice, browser, and coding agents. Fabraix has achieved a 78% attack success rate on the AgentHarm benchmark (vs. 67% for GPT-5.6 Sol) and has already surfaced exploitable vulnerabilities in AI agents at dozens of Fortune 500 companies.

Summary

Fabraix is an Artificial Intelligence company based in San Francisco, United States, founded in 2026. It has raised $500K in total across 1 round, most recently a $500K Pre-Seed round in Jun 2026. Investors include Y Combinator Continuity Fund and Byld Ventures.