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Promptfoo vs OpenAI Evals
Quick verdict
Promptfoo and OpenAI Evals are closely matched on licensing, self-hosting and OpenTelemetry support — the decision comes down to pricing and framework integrations below.
Side-by-side comparison from the Agent Observability Index: licensing, self-hosting, pricing model and integrations — no vendor copy, primary sources linked.
| Promptfoo | OpenAI Evals | |
|---|---|---|
| One-liner | Config-file-driven open-source CLI for prompt evals, regression testing and LLM red-teaming that runs in CI. | OpenAI's original open-source eval framework and registry; largely superseded by the hosted Evals API but still a reference implementation. |
| Category | Evals & Testing | Evals & Testing |
| OpenTelemetry-native | — | — |
| Open source | Yes | Yes |
| Self-hostable | Yes | Yes |
| Pricing model | freemium | free |
| Pricing notes | CLI/library free (MIT); paid enterprise for red-teaming at scale | MIT OSS framework; OpenAI platform also has a hosted Evals product billed via API usage |
| Frameworks | openai-sdk, anthropic, langchain, ollama, vercel-ai | openai-sdk |
| GitHub stars | 22.2k | 18.7k |
| Maturity (GitHub signal) | 100/100 (Mature) | 80/100 (Mature) |
| Funding / ownership | $5M seed (a16z, 2024) | OpenAI |
How to choose
- Both link to primary pricing sources below — verify current tiers before committing; this market shifts monthly.
Sources: Promptfoo · OpenAI Evals
Frequently asked questions
Is Promptfoo or OpenAI Evals open source?
Promptfoo: Yes. OpenAI Evals: Yes.
Can Promptfoo and OpenAI Evals be self-hosted?
Promptfoo: Yes. OpenAI Evals: Yes.
Promptfoo vs OpenAI Evals: which should I choose?
Promptfoo and OpenAI Evals are closely matched on licensing, self-hosting and OpenTelemetry support — the decision comes down to pricing and framework integrations below.