Promptfoo Is Joining OpenAI

#1

Post by Areibman » Mon, Mar 09, 2026, 5:35 PM UTC

Promptfoo Is Joining OpenAI
promptfoo.dev

Re: Promptfoo Is Joining OpenAI

#2

Post by dangelosaurus » Mon, Mar 09, 2026, 5:44 PM UTC

Hey HN - Michael here, co-founder of Promptfoo.

Happy to answer questions.

The one I'd ask if I were reading this: what happens to Promptfoo open source? We're going to keep maintaining it. The repo will stay public under the same license, we will continue to support multiple providers, and we'll keep reviewing PRs and cutting releases.

We started Promptfoo because there was no good way to test AI systems before shipping them. That turned into evals, then red teaming, then a broader security platform. We're joining OpenAI because this work has more impact closer to the model and infrastructure layers.

Ask me anything.

Re: Promptfoo Is Joining OpenAI

#3

Post by exizt88 » Mon, Mar 09, 2026, 6:41 PM UTC

dangelosaurus wrote: post #2

Hey HN - Michael here, co-founder of Promptfoo. Happy to answer questions. The one I'd ask if I were reading this: what happens to Promptfoo open source? We're going to keep maintaining it. The repo will stay public under the same license, we will continue to support multiple providers, and we'll keep reviewing PRs and cutting releases. We started Promptfoo because there was no good way to test AI systems before ship…

You guys absolutely rock. You've built an industry standard with Promptfoo. Keeping it open source was the right choice.

Re: Promptfoo Is Joining OpenAI

#4

Post by tin7in » Mon, Mar 09, 2026, 7:54 PM UTC

dangelosaurus wrote: post #2

Hey HN - Michael here, co-founder of Promptfoo. Happy to answer questions. The one I'd ask if I were reading this: what happens to Promptfoo open source? We're going to keep maintaining it. The repo will stay public under the same license, we will continue to support multiple providers, and we'll keep reviewing PRs and cutting releases. We started Promptfoo because there was no good way to test AI systems before ship…

Thanks for your work and I really really hope the open source project stays maintained. I’ve been using it from the very beginning and it’s been great!

Re: Promptfoo Is Joining OpenAI

#5

Post by rodchalski » Mon, Mar 09, 2026, 9:01 PM UTC

[dead]

Re: Promptfoo Is Joining OpenAI

#6

Post by muhneesh » Tue, Mar 10, 2026, 6:47 AM UTC

dangelosaurus wrote: post #2

Hey HN - Michael here, co-founder of Promptfoo. Happy to answer questions. The one I'd ask if I were reading this: what happens to Promptfoo open source? We're going to keep maintaining it. The repo will stay public under the same license, we will continue to support multiple providers, and we'll keep reviewing PRs and cutting releases. We started Promptfoo because there was no good way to test AI systems before ship…

congrats on the deal.

Re: Promptfoo Is Joining OpenAI

#7

Post by riteshkew1001 » Tue, Mar 10, 2026, 10:01 AM UTC

[flagged]

Re: Promptfoo Is Joining OpenAI

#8

Post by mooreds » Tue, Mar 10, 2026, 1:30 PM UTC

dangelosaurus wrote: post #2

Hey HN - Michael here, co-founder of Promptfoo. Happy to answer questions. The one I'd ask if I were reading this: what happens to Promptfoo open source? We're going to keep maintaining it. The repo will stay public under the same license, we will continue to support multiple providers, and we'll keep reviewing PRs and cutting releases. We started Promptfoo because there was no good way to test AI systems before ship…

Congrats!

What convinced you this was the right moment and the right company to join?

You went from founding to acquisition in roughly a year and change.

Did something about the AI security landscape cause this offer to make sense? Or was it the impact you could have inside OpenAI? Or something else?