Fabraix

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Fabraix is an advanced adversarial verification platform designed specifically for AI agents and multi-agent systems. Built by ex-Meta engineers, it provides a dedicated adversarial staging environment called Nyx that launches over 1,000 automated strategies to stress-test AI systems across security, logic, and alignment. Unlike traditional software testing, Fabraix uses a pure blackbox approach that adapts in real-time to the agent's behavior, helping developers find reasoning gaps, prompt injections, and reward hacking before they reach production. It supports various modalities including text, voice, and browser-based interactions, and integrates directly into CI/CD pipelines for continuous safety coverage.
Adversarial verification platform for AI agents to find security and logic gaps.
FreemiumContact for PricingWebsiteFree
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fabraix.com/
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What is Fabraix?

Adversarial verification platform for AI agents to find security and logic gaps.

Fabraix is an advanced adversarial verification platform designed specifically for AI agents and multi-agent systems. Built by ex-Meta engineers, it provides a dedicated adversarial staging environment called Nyx that launches over 1,000 automated strategies to stress-test AI systems across security, logic, and alignment. Unlike traditional software testing, Fabraix uses a pure blackbox approach that adapts in real-time to the agent's behavior, helping developers find reasoning gaps, prompt injections, and reward hacking before they reach production. It supports various modalities including text, voice, and browser-based interactions, and integrates directly into CI/CD pipelines for continuous safety coverage.

Core Features
Nyx autonomous testing harness with 1,000+ adversarial strategies
Multi-turn, adaptive stress tests that reason across interactions
Pure blackbox testing with no special access or integration required
Multi-modal support for text, voice, images, and browser-based agents
Continuous CI/CD coverage for automated re-testing on every update
Adversarial Cost to Exploit (ACE) research-backed benchmarking
Popular Use Cases
  • Detecting prompt injections and PII exfiltration in LLM chatbots
  • Preventing tool-use hijacking and unsafe code execution in autonomous agents
  • Identifying reward hacking and misalignment in Reinforcement Learning (RL) systems
  • Testing financial advisors for hallucinated advice and compliance gaps
  • Probing healthcare copilots for PHI leakage and unsafe triage logic
Feature Comparison
A functional comparison based on maker input.
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Comparison details are provided for informational purposes and should be verified with the official website.
How to use
  • To use Fabraix
  • users can point the Nyx testing harness at their AI agent's endpoint. No complex integration or internal access is needed due to its blackbox nature. The system then runs parallel adversarial simulations to discover failure modes
  • which are presented in a comprehensive findings report or dashboard.
Pricing
Fabraix uses a freemium pricing model. Pricing and features may change over time.
Research
$0
For academic and independent AI research. 1 target, basic scan coverage, and standard reports.
Team
Custom
For companies building AI. Multiple targets, full interaction library, uncapped scan depth, and dashboard export.
Enterprise
Custom
Dedicated infrastructure, unlimited targets, full remediation support, SSO, and audit logging.
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