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Deep

Deep mode is Babel’s higher-ceremony path: it loads the governed pipeline (OLS v9) and the CLI executor with verification gates. Independent adversarial QA is optional; Desktop requires a different enabled model on the same provider when it is selected. Desktop Plan and Deep currently require OpenRouter.

Terminal window
node .\babel-cli\dist\index.js deep "Harden the migration path and verify it"
  • An orchestrator and pipeline stages (QA review, executor loop).
  • A verifier contract finalize step rather than the chat honesty gate alone.
  • More structure intended for riskier changes.

This is important and stated in the product’s own status documentation:

  • Deep is not a blanket reliability upgrade. Route availability does not mean Deep is more reliable than chat for ordinary tasks.
  • Deep is still maturing. It is under the same active-qualification boundary as the rest of the ordinary coding loop.
  • More ceremony means more time and more provider cost per task, not a correctness score.
  • Changes where an independent adversarial review pass is worth its cost.
  • Tasks where you want the full governed pipeline’s gates, not just the chat completion honesty gate.

Otherwise start with Chat or Plan.