Fabraix

Category

AI & Machine Learning

Launched

July 13, 2026

Stage

Unknown

Founder

Zach

Website

fabraix.com

Fabraix builds autonomous AI agents that adversarially test other AI agents for security vulnerabilities. Their flagship product, Nyx, is a black box testing harness that probes AI systems across security, logic, and alignment. Nyx uses over 10,000 distinct attack strategies—including jailbreaks, prompt injections, exfiltration attempts, and reasoning exploits—in multi turn, adaptive campaigns. It operates without any integration or internal access, simulating real world attacks to surface failure modes that static benchmarks and manual audits miss. Fabraix also offers an open source Playground where researchers and security enthusiasts can run attack campaigns against their own systems and participate in monthly challenges to break live AI agents for rewards.