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How to fork a run at one step and compare models with Orca Replay

Keep the first steps of a recorded run fixed, switch to another model from a chosen checkpoint, and compare results.

Authorization notice. Orca Replay is dual-use. Only use it on software, sites and systems you own or have explicit permission to test.

Who it is forA team lead or developer choosing which model to use for a coding task who wants a fair comparison.

The problemComparing models on a task usually changes the starting context too, so results do not show the effect of the model alone.

The outcomeReplays that match the recording up to checkpoint 4, then continue on a different model, and a comparison table where the model is the only variable.

What you need first

  • Node.js and npm, to install the orcareplay package
  • A coding agent installed locally, such as Claude Code or Codex CLI, to record a run
  • A model API key and network access for recording and for live forked turns
  • A terminal with permission to install a global npm package

Steps

  1. Run npm i -g orcareplay and record a run with orca record claude.
  2. Run orca replay last --from 4 --model claude-haiku-4-5 --ui to continue the same conversation on a different model from step 4.
  3. Run orca compare last --from 4 --models a,b with the model names you want to test in place of a and b.
  4. Run orca show last after each fork to check which turns came from the trace and which came from the network.

Prompt for your agent

Use the OrcaReplay repo (Continuum-AI-Corp/OrcaReplay) to fork the recorded run `last` at checkpoint 4 onto the models <model-a> and <model-b> using `orca compare last --from 4 --models <model-a>,<model-b>`. Report one comparison table with the outcome for each model. Verify that turns before checkpoint 4 are identical across both forks.

Caveat. Forked turns after the cursor call live model APIs, so they need keys and network access and they spend tokens.

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