ACE – A dynamic benchmark measuring the cost to break AI agents

Show HN: Nyx – multi-turn, adaptive, offensive testing harness for AI agents

Based based in San Francisco, CA, USA, ACE – A dynamic benchmark measuring the cost to break AI agents works in show hn launch.

Profile

We built Nyx to solve a problem we kept hitting while building agents: AI agents break in ways traditional software doesn't. Logic bugs, reasoning failures, edge cases that manual testing and static benchmarks never explore.Nyx is an autonomous testing harness that probes your AI agents to find failure modes before users do. It’s used to find logic bugs, instruction following failures, edge cases in agent behavior, and for red-team security testing (jailbreaks, prompt injection, tool hijacking)Technical approach: * Pure blackbox (no special access needed - test like your users interact) * Multi-turn adaptive conversations * Multi-modal testing (voice, text, images, documents, browser interac

Within the show hn launch space, the company focuses on its core offering rather than a broad product line.

The company is recorded as being based in San Francisco, CA, USA.

Directory data places it at the Summer 2026 stage.

Its team size is recorded as 2 employees.

Website: fabraix.com