Promptfoo
The AI red-teaming tool OpenAI had to buy.
- Size
- Startup (1-50)
- Founded
- 2024
- Stage
- Series A
- Last valuation
- $86M
- Raised
- $23.4M
Open-source CLI for systematic LLM security testing. 350K developers. 127 Fortune 500 companies. Acquired by OpenAI March 2026.
NO LINKS READ YET · no published dossier names Promptfoo beside another company
Company details
| Industry | AI & Machine Learning |
| Type | Tech Startup |
| Size | Startup (1-50) |
| Founded | 2024 |
| Funding | |
| Stage | Series A |
| Valuation | $86M |
| Raised | $23.4M |
| Lead investors | Insight PartnersAndreessen Horowitz |
| Website | Visit Promptfoo |
Others in the same industry
5 namesWhere Promptfoo sits against the other names we cover on this beat. Each line is that company’s verdict, not a summary of it.
Amazon (AWS)
AMZNThe 2026-07-30 print settled four of the five questions the prior dossier said it could
Cash $78.2B
Meta AI / FAIR
METAThe bear case arrived a year early and the bull case grew a new leg in the same quarter
Cash $90.3B
Meta Platforms
METAThe buildout stopped being paid for by the ad business and started being paid for by the capital markets
Cash $90.3B
Alphabet
GOOGLThe market spent two years pricing Alphabet as the AI loser; FY2025 (+15% op income, Cloud margin to 24%, Gemini at 750M users, the antitrust gun most…
Cash $55.9B
Palantir
PLTRA genuinely great business priced as a perfect one
Cash $2.0B