Some links on this page may be affiliate links. They never change a rating. Details
OpenAI announced on 9 to 10 March 2026 that it is acquiring Promptfoo, the open-source toolkit many QA and security teams use to evaluate LLM apps and red-team AI agents. Financial terms were not disclosed. If you use Promptfoo in CI today, here is what has been confirmed and what is still open.
What was announced
- The deal: OpenAI said it will acquire Promptfoo to strengthen agentic security testing and evaluation in OpenAI Frontier, its platform for building and running AI agents.
- Open source stays: OpenAI said Promptfoo will remain open source under its current license and that it will keep supporting current customers.
- Adoption: OpenAI said more than 25% of Fortune 500 companies use Promptfoo.
- Funding history: Promptfoo had raised about $23 million before the deal, including $18.4 million from Insight Partners in July 2025.
- Plan: OpenAI said security and safety testing for risks such as prompt injection, jailbreaks, data leaks and tool misuse would become built-in features of Frontier, with reporting for oversight and compliance.
Why it matters for QA teams
Agent testing is moving from a side project to a platform feature. Promptfoo was one of the few neutral, config-file-driven tools that worked the same against any model provider. Teams that test several vendors side by side will want to watch whether that neutrality holds in practice.
This is our reading, not something OpenAI or Promptfoo has said: nothing in the announcement changes how the open-source CLI works today, so there is no reason to rip it out of a working pipeline.
What we would do now
- Pin your version. Lock the Promptfoo version in CI so a future release never changes your pass or fail results unexpectedly.
- Keep your test cases portable. Store prompts, assertions and datasets in your own repo, so you can run them in another framework if you ever need to.
- Compare alternatives once. Run the same dataset through DeepEval or Ragas and note the differences while nothing is forcing your hand. Our Promptfoo vs DeepEval comparison is a good starting point.
New to the tool? See our Promptfoo tutorial and Promptfoo review.
Frequently Asked Questions
Is Promptfoo still free and open source after the OpenAI acquisition?
OpenAI said Promptfoo will remain open source under its current license, and that it will continue to support current customers. Check the project repository for any later license change.
Do I have to use OpenAI models to use Promptfoo?
Nothing in the announcement says so. Promptfoo has been model-agnostic, and OpenAI has not announced a change to that.
Should I switch to a different LLM testing tool?
Not because of this news alone. Pin your version, keep your tests portable and revisit the decision if the license, roadmap or support terms change.
Sources
- Infosecurity Magazine: OpenAI’s Promptfoo deal plugs agentic AI testing gap
- OpenAI announcement on X
- CSO Online: OpenAI to acquire Promptfoo
QA automation engineer. Each guide says what I ran myself and what I only researched, and I update it when things change. About me
One useful email a week
New guides, tool price changes and AI testing news. No spam.
