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docs(study): record predictions before the pilot - #113

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Oct 7, 2026
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Fills §3 of docs/decisions/2026-10-05-scaffold-vs-model.md before any small-model run. Once this merges, the predictions aren't edited again; misses get reported next to the results.

Rows reworded before recording

The first draft predated S5, so some rows couldn't be scored against study.md:

  • P1/P2 used right_disposition on the hard tier, which has 5 cases, so the CI would be about ±40pp. They now use the honest pass on the generated tier, which has 30 scored cases.
  • P4/P5 now name the generated tier, and P6 now names a size (8B).
  • P7 is now t₅₀ from the signal sweep.
  • P8 is new: the bare-model t₅₀ at 1.7B. Condition C has no deterministic floor on t₅₀, so that's where overclaiming would show.

The predictions

# Prediction Value (band) Confidence
P1 1.7B, A, honest pass 30% (±15pp) 60%
P2 8B, A, honest pass 70% (±15pp) 60%
P3 Share of 1.7B A failures that are structural 60% (±20pp) 60%
P4 A − C at 1.7B +20pp (±15pp) 55%
P5 A − C at 8B +5pp (±10pp) 55%
P6 Largest single-ablation drop at 8B typed termination 50%
P7 1.7B A t₅₀ 1.5 (±0.5) 50%
P8 1.7B C t₅₀ 0.8 (±0.5) 50%

The doc records that the values were proposed in a Claude Code session and adopted unchanged. It also lists the reference points known at the time. The write-up's Predictions section now summarises the table instead of holding a placeholder.

The change is docs only. tests/agentic/test_loop_ablations.py, the one test that references these docs, passes.

https://claude.ai/code/session_01NTGRQQFQZy48NmjGdxEQuN


Generated by Claude Code

Fills §3 of the scaffold-vs-model decision doc. The rows are reworded first so that each one
names the number in study.md it is scored against: honest pass on the generated tier instead
of right_disposition on the 5-case hard tier, a tier for the A − C gaps, a size for the
ablation question, and t50 for the curve. P8 (bare-model t50) is added. The write-up's
Predictions section summarises the table.

Claude-Session: https://claude.ai/code/session_01NTGRQQFQZy48NmjGdxEQuN
@Padraigobrien08
Padraigobrien08 merged commit cb02202 into main Oct 7, 2026
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