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Experiments start in two places: New experiment at the top right of Simulation, or Run simulation on a cluster’s detail page. Either way the same drawer opens, and after three steps the experiment runs in the background.
Step 2 of the new-experiment drawer, showing candidate count, budget, the three experiment options, and the suggestions box
1

Select cluster

“Which cluster should we fix?” Pick a cluster from the list. Each row carries its category tag and signal count, and Search clusters narrows it down. If you came from a cluster’s detail page, this step is already filled in.
2

Configure options

“Which options should we use?”
  • Candidates 2, 3, 4, or 6. The default is 4.
  • Budget (USD) the spending cap for the experiment. The default is $2.
  • Experiment options
    • Cost optimization sweeps models and config for a cheaper candidate that keeps accuracy.
    • Consistency replays each input k times and measures stability. Turning it on lets you set k (default 3).
    • Hold-out regression guards previously-correct cases against regression. Choose Off, Light, or Full.
  • Suggestions for this experiment (optional) free text to steer the direction. For example: “Keep the prompt as-is and try improving it by tweaking guardrails, memory, or retrieval instead.”
  • More options → Reference folders (optional) pick folders to score candidates against a hand-built golden set. If you pick none, the cluster’s own cases are used.
3

Launch

“Shall we start?” The cluster, category, candidates, budget, holdout, and instructions are summarized. Press Start experiment.

While it runs

The experiment runs in the background. A measuring card appears in the board’s Experiment column, and opening it shows candidates being built in real time (see Experiment results). You can close the drawer and do something else.

Learn more

Experiment results

Read the candidates and metrics the experiment produced.

Guarding against regressions

What the Hold-out regression option does.