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Promptfoo

San Francisco, CA · Founded 2024 · Privately Held (backing)

Operator of an open-source large language model testing company intended to discover and eliminate major large language model risks. Promptfoo is based in San Francisco, CA and was founded in 2024. It was valued at $85.5 million at its early-stage round in Jul 2025, the last priced event on record. It has raised $22.7 million across 2 recorded rounds; the latest was a $17.5 million early-stage round in Jul 2025.

PMV mark · valuation
$85.5M
Oct 2026
Priced at
its early-stage round
Jul 2025
Total raised
$22.7M
Last round
Early Stage VC
Jul 2025

Promptfoo key facts

as of Oct 2026
  • Operator of an open-source large language model testing company intended to discover and eliminate major large language model risks.
  • Promptfoo is valued at approximately $85.5M as of Oct 2026, set at its early-stage round, Jul 2025; nothing has traded since, per PrivateMarketView’s mark.
  • It has raised $22.7M across 2 recorded rounds; the latest was Early Stage VC ($17.5M) in Jul 2025.
  • Notable investors include Andreessen Horowitz, Insight Partners (New York), Uncorrelated Ventures, 515 Ventures, Tobi Lütke — 8 tracked in total.
  • Promptfoo has filed 2 Form Ds with the SEC since 2024, most recently Jul 2025 ($17.5M sold to 3 investors).
  • Status: Privately Held (backing).
PrivateMarketView mark
LOW confidence
$85.5M

Valued at $85.5M at its early-stage round, Jul 2025. Nothing has traded since.

set by its last priced roundas of Oct 2026question about this number?
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Promptfoo funding rounds

2 rounds
Jul 2025Early Stage VC$17.5MSEC filing▮
Jun 2024Early Stage VC$5.2MSEC filing▮
Full funding history →

Promptfoo valuation

Promptfoo was valued at $85.5 million at its early-stage round in Jul 2025. That is the last priced event on record: no secondary trade or institutional fund mark has moved the figure since.

How much has Promptfoo raised?

Promptfoo has raised $22.7 million across 2 recorded rounds since 2024. The largest was a $5.2 million early-stage round in Jun 2024; the most recent was a $17.5 million early-stage round in Jul 2025.

Promptfoo has filed 2 Form Ds with the SEC since 2024, most recently in Jul 2025 ($17.5 million sold to 3 investors).

Promptfoo investors

8 investors are on record for Promptfoo, including Andreessen Horowitz, Insight Partners (New York), Uncorrelated Ventures and 515 Ventures. The early-stage round in Jul 2025 drew 3 investors.

About Promptfoo

Operator of an open-source large language model testing company intended to discover and eliminate major large language model risks. The company provides an open-source testing platform that custom probes for applications that identify failures and uncover potential failure modes using generating attacks and jailbreaks customized to the application, enabling developers to move quickly with a command-line interface, live reloads, and caching without software development kits, cloud dependencies, or logins.

Sector
Information Technology
HQ
San Francisco, CA, United States
Founded
2024
Employees
11
Ownership
Privately Held (backing)

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