Parameter

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4.1Score#157 of 999 agents#4 of 12 in Pentester

Why it ranks #157

Parameter, an AI pentester from YC W26, ranks #157 of 999 AI agents and #4 of 12 in Pentester, with a score of 4.1 of 10. Data as of 3 Oct 2026.

The score adds four parts, each 0 to 10, by weight. Every point comes from public evidence. How scoring works ·

Proof 4 × 30% 1.2
Scale 4 × 30% 1.2
Momentum 3 × 25% 0.8
Autonomy 6 × 15% 0.9
= 4.1

Proof
Do customers use it? 30% of the score
4
Claims a customer result and work done at scale.
- +2
  A customer result
  “Through this, we have prevented an estimated $3B+ in potential damages (based on exposed record counts and IBM's Cost of a Data Breach benchmarks).”
  Launch YC post · 9 Feb 2026
- +2
  Work done at scale
  “In the past few weeks, our agents found critical vulnerabilities in dozens of YC companies (ones you’ve heard of): SQL injection exposing billions of records, demonstrated a PoC worm that could infect entire networks, gained access to hundreds of codebases, and more.”
  Launch YC post · 9 Feb 2026
Not found: revenue or growth (+4), named customers (+3), a customer count (+2)
Scale
Is there a real company behind it? 30% of the score
4
14 people.
- +4
  14 people on its YC page10 to 19 people
Not found: funding round in its news (+3)
Momentum
Is it shipping and growing now? 25% of the score
3
Shows hiring and a new batch.
- +2
  Hiring: 2 open rolesMember of Security Staff, Member of Technical StaffYC page
- +1
  New: YC Winter 2026
Not found: launch YC post in the last 6 months (+3), new traction claim in the last 6 months (+2), funding news in the last year (+2)
Autonomy
How much of the job does it do on its own? 15% of the score
6
Supervised agent: takes actions in other systems; a person approves key steps.
- +6
  Level 2 of 4: Supervised agentTakes actions in other systems; a person approves key steps.
What the model read
- Acts in other systems: 69% likely
- Finishes whole tasks: 36% likely
- Calls itself an agent: 98% likely
Level 2: Takes actions in other systems; a person approves key steps.

About Parameter

Parameter builds AI agents that run continuous penetration tests against your apps and infrastructure. Instead of a once-a-year penetration test, Parameter's agents works 24/7 to find and verify critical vulnerabilities so you can prevent them before attackers.

Formerly Hex Security