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Learnings from Jev

@_pi0_
Pooya Parsa 🧈@_pi0_
14 views Sep 18, 2026 ~1 min read
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This morning i was reading a very nice article from @4rcherhume reverse engineering @typesafeai Jev. It had many intresting findings that made me doing some evals on the model to learn more about it.

https://x.com/i/status/2100531690427031906

  • Code examples below use advocaat
  • Research was done by Fable you can check evals and results
  • 1. Options order changes result

    Mutiple evals showed that reordering labels moved probabilities by up to %20. Keep the map stable, and re-test results when edited.

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    2. Batch independent questions

    Shared state is charged once. Questions can be answered in parallel.

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    3. Put shared facts in state instead of option descriptions.

    Multiple questions can’t read each other’s instructions or answers.

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    4. Compute in code. Ask for judgment.

    Use deterministic code for exact calculations. Use the model to interpret the situation.

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    5. .confidence field is derived

    confidence is derived from the probability distribution.

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    6. Calibrate thresholdson your own data.

    Start with 100-150 labelled real examples. Check accuracy within probability bands, then choose your thresholds.

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