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Modal Modal is a serverless container platform with sub-second cold starts and Python-first ergonomics. Phoenix uses Modal as a hosted backend for Python code evaluators that benefit from Modal’s fast container scheduling, generous timeouts, and pay-per-execution pricing.

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Configure

  1. Sign up at modal.com and create a token pair.
  2. Add MODAL_TOKEN_ID and MODAL_TOKEN_SECRET from Settings → Sandboxes.
See Settings → Sandboxes → Modal for full configuration details and Sandbox Backends for self-hosting setup.