The AI Tea
At a glance
- What changed
- Anthropic says it is handing Petri, its open-source alignment auditing toolbox, to Meridian Labs and releasing Petri 3.0 with more adaptable and realistic behavior tests.
- Why it matters
- Safety tests matter most when multiple labs and regulators can trust and reuse them. Moving a widely used audit tool to an independent home can make results feel more neutral while keeping the tooling maintained as model APIs evolve.
- Who is affected
- AI users, security teams, policy watchers
- What to do next
- Watch whether Meridian Labs publishes clearer baselines and versioning so different labs can compare results over time without tool drift.
What changed
On May 7, 2026, Anthropic said it is transferring development of Petri, its open-source alignment testing toolbox, to Meridian Labs alongside updates branded as Petri 3.0.
Why it matters
Safety tests matter most when multiple labs and regulators can trust and reuse them. Moving a widely used audit tool to an independent home can make results feel more neutral while keeping the tooling maintained as model APIs evolve.
In plain English
Petri runs scripted, multi-step “test conversations” to see how an AI model behaves. Anthropic says an independent nonprofit will now maintain and improve it.
What this means for you
Who is affected: AI users, security teams, policy watchers
Next move: Watch whether Meridian Labs publishes clearer baselines and versioning so different labs can compare results over time without tool drift.
- Anthropic says Petri 3.0 changes the architecture to make audits more adaptable across use cases.
- It describes a “Dish” add-on meant to make tests more realistic and reduce eval-awareness artifacts.
- Anthropic says Petri is moving to Meridian Labs so the tooling is not owned by a single AI lab.
What remains uncertain
Watch whether Meridian Labs publishes clearer baselines and versioning so different labs can compare results over time without tool drift.