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Re-measured at a non-binding cap with finish_reason recorded

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  # zeroproof-retail-concise-4b
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  **A Qwen3-4B retail agent that answers first and stops, with nothing in the
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- prompt telling it to.** 85.3% of held-out replies are in the register against
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  11.8% for the base, with no increase in omitted information.
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  The companion to
@@ -30,17 +30,30 @@ process serving base weights and adapter. Every row graded in both arms.
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  | | Base | This adapter |
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  |---|---|---|
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- | In the register | 0.118 | 0.853 |
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  | Omitted required information | 0.015 | 0.015 |
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  | Median reply length | 442 chars | 201 chars |
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- Delta +0.735, paired bootstrap over prompts, 95% CI **[+0.662, +0.809]**.
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- 100 prompts improved, 0 regressed, 36 unchanged. Sign test one-sided
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- p = 7.9e-31. At 136 prompts the eval resolves +0.074 or larger.
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  Register judged by Phi-4, a different model family from the policy. Omission
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  decided in code against the identifiers each question requires.
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  ### Answer-production rate
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  The register rate is conditional on the model having produced an answer at
 
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  # zeroproof-retail-concise-4b
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  **A Qwen3-4B retail agent that answers first and stops, with nothing in the
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+ prompt telling it to.** 83.8% of held-out replies are in the register against
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  11.8% for the base, with no increase in omitted information.
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  The companion to
 
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  | | Base | This adapter |
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  |---|---|---|
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+ | In the register | 0.118 | 0.838 |
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  | Omitted required information | 0.015 | 0.015 |
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  | Median reply length | 442 chars | 201 chars |
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+ Delta +0.721, paired bootstrap over prompts, 95% CI **[+0.647, +0.794]**.
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+ 98 prompts improved, 0 regressed, 36 unchanged. Sign test one-sided
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+ p = 3.2e-30. At 136 prompts the eval resolves +0.074 or larger.
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  Register judged by Phi-4, a different model family from the policy. Omission
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  decided in code against the identifiers each question requires.
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+ **Truncation, measured not inferred.** `finish_reason` is recorded per row.
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+ On this evaluation every reply in both arms finished on its own: 0.0% not-EOS
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+ base, 0.0% not-EOS trained, an inter-arm gap of 0.0 points, with the token cap
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+ at 2048 where neither arm reaches it. Base replies run to a median of 437
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+ characters and a 95th percentile of 2083, so the cap is not shaping the
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+ quantity being judged.
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+
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+ The cap is not a neutral parameter when the trait is concision: too low it
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+ clips the base toward brevity and understates the gain, too high it lets the
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+ base ramble and inflates it. Re-measuring at 2048 against an earlier 700 moved
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+ the airline delta not at all (+0.899 both) and retail by -0.014, so the cap was
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+ doing no work in either direction.
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+
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  ### Answer-production rate
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  The register rate is conditional on the model having produced an answer at