OpenAI Acquires AI Security Startup Promptfoo To Enhance AI Agent Safety
Building Size
—
Asset Type
—
Closing
Mar 9, 2026
About this deal
AI
OpenAI has acquired Promptfoo, an AI security startup founded in 2024 by Ian Webster and Michael D’Angelo. This acquisition aims to strengthen the safety of OpenAI's AI agents, although specific deal value details are not disclosed.
Summary of transaction details:
- Deal Type: Acquisition
- Transaction Amount: Not disclosed
- Company Name: Promptfoo
- Founders: Ian Webster and Michael D’Angelo
- Headquarters: San Francisco, California
- Specialization: Testing LLMs for vulnerabilities
- Clients: Over 25% of Fortune 500 companies
Promptfoo specializes in both open-source libraries and enterprise solutions for security evaluation of agentic workflows, including automated red-teaming and risk monitoring. The integration of Promptfoo’s technology into OpenAI Frontier will expand its open-source offerings.
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Market CRE Market Snapshot
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Purchase Price
Annual NOI
Loan Amount
Interest Rate (%)
Loan Term (yrs)
Down Payment (%)
Cap Rate
5.80%
Cash-on-Cash
-1.66%
Monthly Payment
$14,164
Annual Debt Svc
$169,964
Annual Cash Flow
$-11,334
DSCR
0.93