What differs
- Engagement: Gray Swan offers private red teaming scoped to your model, policies, and attack surface, plus adversarial evaluation for model builders; HackerOne offers 15- or 30-day engagements that launch in about one week.
- Testers: Gray Swan draws on its Arena network (page cites 23,000+ red teamers); HackerOne uses vetted AI security researchers with a dedicated Solutions Architect.
- Deliverables: Gray Swan lists reproducible transcripts, severity classifications, and a remediation roadmap; HackerOne lists reproducible attack traces, proof of exploit, framework mapping, and retesting.
- Published security: Gray Swan lists SOC 2 Type 2 and Cyber Essentials; HackerOne lists SOC 2 Type 2, ISO 27001, FedRAMP, and UK Cyber Essentials Plus.
Who each tends to fit
Model builders wanting pre-release adversarial benchmarks and checkpoint comparisons may look at Gray Swan. Enterprises wanting a time-boxed test of a deployed AI application with findings mapped to security frameworks may look at HackerOne.
Last checked: . No winner declared.