Petri
Open-source automated alignment auditing tool that probes target models with multi-turn simulated scenarios.
| Category | Evals & Testing |
| Open source | Yes |
| Self-hostable | Yes |
| Pricing model | free |
| Pricing notes | Open source |
| Framework integrations | Inspect AI |
| Funding / ownership | Released by Anthropic (2025); stewardship donated to nonprofit Meridian Labs (2026) |
| GitHub stars | 1,230 |
| Maintenance | active (commit 2026-06-12) |
| License (GitHub) | MIT |
| Open issues | 1 |
| Maturity signal | 87/100 (Mature) — computed from public GitHub signals, see methodology |
Pricing/feature source: https://www.anthropic.com/research/petri-open-source-auditing
Maturity signal is computed from public GitHub data only. How it is calculated.
Frequently asked questions
Is Petri open source?
Yes. Licensed under MIT.
Can I self-host Petri?
Yes — Petri can run in your own infrastructure.
How much does Petri cost?
Free. Open source