Promptfoo is an open-source platform for identifying and fixing vulnerabilities in AI models and applications, headquartered in San Francisco, United States, founded in 2024.
| Date | Round | Amount | Investors |
|---|---|---|---|
| 2025-07-30 | Series A | $18.4M | Insight Partners, Andreessen Horowitz |
| 2024-07-22 | Seed | $5M | Andreessen Horowitz |
Promptfoo was acquired by OpenAI (2026-03-09).
Data from The Signal by Return on Security — cybersecurity funding, M&A activity, and company intelligence.