Promptfoo
promptfoo.dev
Actively hiring
Cybersecurity
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Financials
Funding and backers
Total raised
$22.7M
2 rounds on record
Latest round
$17.5M
Series A · Jul 2025 · 15 mo ago
Team
17
US Form 5500 (plan participants) · Dec 2025
Backers
2
Insight Partners, Andreessen Horowitz
The money's age
Due for its next round
15 months since the last round · not hiring
Momentum
15/100
rising traction
Last sign of life
this month
a posting or a news item
The story so fareach stage dated by its source: the company's releases, the press, registers, filings
Mar 9
Acquired OpenAI to acquire Promptfoo to expand AI application testing capabilities · SiliconANGLE
Jul 1, 2025
Raised a round Series A $17.5M · SEC Form D
Jun 28, 2024
Raised a round Venture round $5.2M · SEC Form D
2024
Founded
Tractionpublic signals, read monthly
Funding rounds
| Round | Date | Amount | Investors | Source |
|---|---|---|---|---|
| Series A | Jul 2025 | $17.5M | — | SEC Form D |
| Venture round | Jun 2024 | $5.2M | — | SEC Form D |
Registers and programsofficial lists and records that name the company
| Legal entity | Promptfoo, Inc. | SEC Form D |
Founders and leadersfrom filings, registers and the company's site
Ian WebsterExecutive Officer, DirectorSEC Form D
Backed byfrom the funds' portfolios and accelerator catalogs
Insight Partners 
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News
OpenClaw at Work: Prompt Injection Risks
OpenClaw combines web browsing, local file access, and outbound actions in one user-facing assistant. The capabilities that make OpenClaw valuable for work also increase the security risk. In a controlled lab, we tested a local OpenClaw deployment with br
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Report
OpenAI Acquires Cybersecurity Startup Promptfoo to Strengthen AI Agent Security
OpenAI is acquiring Promptfoo to strengthen AI agent security, adding enterprise testing tools for jailbreaks, prompt injections, data leaks, and governance.
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Report
McKinsey's Lilli Looks More Like an API Security Failure Than a Model Jailbreak
McKinsey's Lilli looks, on the public record, like an application-security incident that reached an AI system, not a model jailbreak. CodeWall's March 9, 2026 writeup says its autonomous agent found exposed API documentation, unauthenticated endpoints, a
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Report
OpenAI to acquire Promptfoo to expand AI application testing capabilities
OpenAI to acquire Promptfoo to expand AI application testing capabilities - SiliconANGLE
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OpenAI to buy cybersecurity startup Promptfoo to better safeguard AI agents
Promptfoo's team will join Sam Altman-led OpenAI, and its technology will be integrated into the Frontier platform for AI agents.
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Report
OpenAI to acquire AI security platform Promptfoo
OpenAI are acquiring Promptfoo, an AI security platform that helps enterprises identify and remediate vulnerabilities in AI systems.
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Report
The open-source AI red-teaming tool used by Fortune 500 companies is now part of OpenAI
OpenAI is acquiring Promptfoo, the AI red-teaming startup used by 125k developers and 30+ Fortune 500 firms, to strengthen security on its Frontier enterprise agent platform.
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Report
Open-Sourcing ModelAudit: Security Scanner for ML Model Files
Before joining Promptfoo, I worked on model scanning at Databricks. Teams pulled models from public registries, ran torch.load(), and treated the artifact like inert data. Model files are executable at load time. Since joining Promptfoo last September, I'
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People
Ian Webster
Executive Officer, Director
Michael D'Angelo
Director
Ganesh Bell
Director
Names and roles come from public filings, company registers and the company's own site. Is this you? Correct or remove · How we handle this data
Offices
Where the company hires and what each office is for
Cities
1
Hiring now
0
Countries
1
San Mateo
United States
HQ
50-200 est. staff