PiggyGPT

Private companiesCovered

Promptfoo

San Francisco, CA · Founded 2024

Promptfoo makes an open-source tool and enterprise platform for evaluating and red-teaming language-model applications and AI agents.

Funding

Last round or tender
Series A, Jul 29, 2025, $18M raisedPromptfoo, Jul 29, 2025Led by Insight Partners. No valuation was stated.
Last valuation
No citable valuation

Secondary venues

No public venue page on file.

A venue is listed when its public page named the company on the date shown. Nothing is recorded from behind a login, and no indicative price is shown anywhere on this site.

Reads

Acquisition: Closed

The acquisition completed.

Prepared by PiggyGPT, as of Oct 7, 2026

Signals

  • Mar 9, 2026OpenAI announced it is acquiring Promptfoo, subject to customary closing conditions; no price was disclosed.OpenAI, Mar 9, 2026
  • Oct 7, 2026Promptfoo’s undated about page states it is now part of OpenAI; no closing date is given.Promptfoo

Named counterparties

  • OpenAIThe acquirer, by its announcement of March 9, 2026.OpenAI, Mar 9, 2026

Counterparties are named for a cited reason: a partnership, an investment, or a stated appetite. Naming is not a forecast.

A summary of what the figures on this page add up to, prepared by PiggyGPT from the record on file and its cited sources. Not the Street's view, and not advice.

Sources

Researched Oct 7, 2026