aid: fabraix
name: Fabraix
description: >-
  Fabraix builds red-teaming AI agents that continuously find security
  vulnerabilities in customer-facing AI systems. Its flagship product, Nyx,
  autonomously discovers exploits across chat, voice, browser, and coding agents
  without needing source-code access, drawing on a library of more than 10,000
  jailbreaks and adaptive attack strategies that pursue promising approaches
  across hundreds of interactions. Fabraix also created ACE (Adversarial Cost to
  Exploit), a game-theoretic benchmark that measures AI security by the cost of
  a successful attack, enabling continuous, lower-cost vulnerability testing that
  re-assesses systems with each update. Fabraix is a Y Combinator (Summer 2026)
  company. This profile is maintained by the API Evangelist network; no public
  API, developer documentation, or machine-readable surface has been published
  by Fabraix at this time.
url: https://raw.githubusercontent.com/api-evangelist/fabraix/refs/heads/main/apis.yml
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://fabraix.com/og.png
x-type: company
x-source: vc-portfolio
x-backed-by:
- y-combinator
x-tier: stub
x-tier-reason: portfolio-lead
x-batch: Summer 2026
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- AI Security
- Red Teaming
- AI Agents
- Adversarial Verification
- Cybersecurity
- LLM Security
- Y Combinator
apis: []
common:
- type: Website
  url: https://fabraix.com
- type: X
  url: https://x.com/fabraixhq
- type: CompanyProfile
  url: https://www.ycombinator.com/companies/fabraix
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence