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OpenAI announced on March 9, 2026, that it had agreed to acquire Promptfoo, an open-source platform for evaluating and security-testing AI applications. OpenAI said it plans to integrate Promptfoo’s technology into its Frontier enterprise platform after the deal is finalized; the announcement said closing remained subject to customary conditions, so the planned integrations should not be treated as already available.
What is the OpenAI–Promptfoo deal?
OpenAI announced an agreement to acquire Promptfoo on March 9, 2026. The companies did not disclose a purchase price or other financial terms in their official announcements. OpenAI said the transaction was still subject to customary closing conditions.
Promptfoo separately said it had agreed to be acquired and would remain open source while continuing to serve users and customers. Its current repository describes the project as part of OpenAI and says it remains available under the MIT license; that project-status wording does not establish the legal closing date. OpenAI’s announcement and Promptfoo’s announcement provide the companies’ statements.
What does Promptfoo do?
Promptfoo is software, not a physical product: a command-line interface (CLI) and library for evaluating and red-teaming applications built with large language models. Developers can use it to test prompts, models, AI agents, and retrieval-augmented generation (RAG) systems, as well as run security and code scans and connect testing to continuous integration and delivery (CI/CD) workflows. Its project supports multiple model providers. The Promptfoo repository describes its capabilities and MIT license.
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That makes Promptfoo relevant to organizations putting AI into products or internal processes: tests can be run during development to help find weaknesses before deployment, and teams can use results to decide what to fix or investigate. The acquisition announcement does not establish that any particular vulnerability will always be found or prevented.
How does AI red teaming differ from evaluations?
Evaluations measure whether an AI system behaves as intended against defined tests. Red teaming probes the system with adversarial, abusive, or unexpected inputs to expose failure modes. The two approaches complement each other: evaluations can track expected behavior systematically, while red teaming looks for ways the system may fail under pressure or misuse. OpenAI explains the distinction in its red-teaming guidance.
OpenAI’s guidance also says to use its Red Teaming service only on code or assets you own or are expressly authorized to test. That is a practical boundary for security work: do not probe someone else’s system without permission.
Why is OpenAI acquiring Promptfoo?
OpenAI said it wants to make security and evaluation more closely available in enterprise AI development. It identified three intended areas for Promptfoo technology in Frontier:
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- Automated security and safety testing.
- Integration of security and evaluation into development workflows.
- Reporting and traceability to support oversight and accountability.
The announcement named prompt injection, jailbreaks, data leaks, tool misuse, and agent behavior outside policy as risks the planned testing could help enterprises identify and remediate. These are examples of the problems the companies say they aim to address, not a guarantee that the planned integration is live or that testing can eliminate the risks.
What adoption figures did Promptfoo report?
Promptfoo said in 2026 that more than 350,000 developers had used its product, including 130,000 monthly active developers. It also said teams at more than 25% of Fortune 500 companies relied on it. These are company-reported figures, not independently audited adoption results. OpenAI’s announcement described Fortune 500 adoption as “over 25 percent.”
Will Promptfoo remain open source?
Promptfoo’s co-founders said the project would remain open source and the company would continue serving users and customers. The current repository identifies Promptfoo as part of OpenAI and retains the MIT license. The repository provides a concrete signal of the project’s stated status, but it does not by itself resolve when the acquisition legally closed or what future product changes may occur.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What this means for developers and enterprise buyers
For developers, Promptfoo’s stated open-source and MIT-licensed status means the project remains available as software that can be incorporated into development workflows. For enterprise buyers, OpenAI’s stated plan points toward tighter integration of testing, security, and reporting into Frontier, but the announcement does not specify a launch date, exact feature set, or commercial terms for those capabilities.
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OpenAI also describes a managed enterprise red-teaming service, while Promptfoo is a developer-facing CLI and library. They address related security needs through different delivery models: self-service tools in a development workflow versus managed coordination for enterprise customers. Choose based on whether your team needs hands-on tooling embedded in its build process or a managed exercise; in either case, define authorization, test scope, and how findings will be tracked before testing begins. OpenAI’s Red Teaming Network announcement describes its enterprise service.
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