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.
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