origin
What changes when survival depends on both behavior and the environment?
Organisms with evolving neural controllers compete for food and reproduce in a shared environment.
Open worldFive models, shared experimental methods.
Explore how simple interactions produce complex behavior. Each world runs in your browser, with a sandbox, challenges, and a hypothesis lab for comparing controlled interventions.
swarm
When do local interactions produce coordinated motion?
Agents respond to nearby neighbors through alignment, cohesion, and separation rules.
Open world
morph
How do reaction and diffusion rates change a pattern?
A Gray-Scott reaction-diffusion system forms spots, stripes, and other spatial patterns.
Open world
market
How do agent strategies affect prices and volatility?
Trading agents with different strategies interact through an order book in a simplified market.
Open world
social
Which interactions lead to consensus or polarization?
Opinions evolve as agents interact across a network with adjustable topology and influence.
Open worldRun an experiment
The hypothesis lab uses the same procedure across all five worlds.
Define the comparison
State a hypothesis and choose a control and treatment. Change a parameter and select the outcomes to measure.
Repeat with seeded runs
Run multiple replicates so the comparison accounts for variation between runs. Reusing a seed reproduces the same simulation.
Inspect the result
Compare the measured outcomes, effect sizes, and corrected significance tests. The result describes the model under those conditions.
Scientific reasoning benchmark
Petri-bench gives model agents hidden interventions to investigate through a limited number of experiments. It scores the answer and whether the conclusion is supported by an isolating experiment.
Programmatic access
The MCP server exposes the same simulation engines to agents for deterministic, headless experiments.
npx -y petri-labs-mcp