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HackerOne

Bug bounty platform with time-boxed AI red teaming

Human-led engagementsAutomated platformAgents and toolsFrontier model safetyCrowdsourcedCompliance mapping

HackerOne’s AI Red Teaming runs 15 or 30 day engagements by vetted AI security researchers supported by adversarial agents, with a dedicated solutions architect. It tests prompts, models, APIs, integrations and agent workflows, and maps findings to six frameworks, from OWASP LLM Top 10 to ISO/IEC 42001. In Feb 2025 it ran Anthropic’s CBRN-focused jailbreak challenge: 339 participants and $55K paid to four teams.

Best for: A fixed-length test by many researchers, or a public jailbreak bounty.

$49M Series E (Jan 2022), about $160M raised in total

  • ✓ Maps to OWASP
  • ✓ Maps to MITRE ATLAS
  • ✓ Maps to the EU AI Act
  • – SOC 2 or ISO 27001
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Facts checked November 9, 2026 against the sources listed below. HackerOne does not pay to appear here.

1 Legal nameHackerOne
2 HeadquartersSan Francisco, CA, USA
3 Founded2012
4 TeamNot disclosed
5 What they testLLM apps, Agents and tool use, RAG, Prompt injection and jailbreaks, Data leakage, Bias and harms, Frontier safety (CBRN, cyber)
6 FrameworksOWASP LLM Top 10, OWASP Agentic Top 10, MITRE ATLAS, NIST AI RMF, EU AI Act, ISO/IEC 42001, Gartner AI TRiSM, CWE
7 CertificationsNot disclosed
8 Published pricesNot disclosed
9 Customers and partnersRan Anthropic’s Constitutional Classifiers jailbreak challenge in Feb 2025. Quotes Snap as an AI red teaming customer and shows IBM, Adobe, Zoom and Cloudflare logos.

Where we recommend them

Worth knowing before you sign

  • Feb 2026 researcher backlash over terms that seemed to allow AI training on reports; the CEO said it does not train on submissions, and the terms were updated.
  • Paused Internet Bug Bounty submissions in 2026, citing a flood of AI-generated reports.
  • Stats such as 1,700+ AI assets tested are self-reported.

Go to HackerOne's site

Sources

  1. Vendor: AI red teaming
  2. Vendor blog: Anthropic jailbreak challenge
  3. SecurityWeek: Series E
  4. The Register: AI training terms
  5. SC Media: CEO statement

Work at HackerOne? Send corrections with a source to editors@bestairedteamingcompanies.com. We fix verified errors within five business days.

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