Fabraix
fabraix.com
Vulnerability Management
Penetration Testing
Cybersecurity AI
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Backers
2
Y Combinator, BYLD
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The story so fareach stage dated by its source: the company's releases, the press, registers, filings
Jun 2026
Went through Y Combinator
Feb 10
Launched on Hacker News Show HN: Fabraix Playground – Weekly Wordle for Breaking AI Agents
Apr 2025
Website went live first capture in the Wayback Machine
Tractionpublic signals, read monthly
Backed byfrom the funds' portfolios and accelerator catalogs
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News
Bounding the Blast Radius: A Survey of Prompt-Injection Defenses for LLM Agents
Prompt injection has no known general solution. We organize the defense landscape into a four-layer taxonomy, analyze the documented failure mode of each layer, and argue for composing defenses under explicit cost and latency budgets, then verifying the r
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Adversarial Cost to Exploit (ACE): A Dynamic Benchmark for AI Agent Security
We introduce Adversarial Cost to Exploit (ACE), measuring the token expenditure an adversary must invest to breach an LLM agent. Six budget-tier models show an order-of-magnitude variance in adversarial cost.
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2026 so far has matched all of 2024 for AI security incidents.
We catalogued 41 AI security incidents since January 2024. Q1 2026 alone matched all of 2024. March had 8 - the worst single month on record.
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SWE-bench will hit 90% this year.
Six models are within 1.3 points on SWE-bench Verified. Binary benchmarks are saturating - what will replace them?
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Offices
Where the company hires and what each office is for
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Countries
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San Francisco
United States
HQ