Concept
HEADPASS-X2b
The one retrieval change that worked: also feed the model the passages next to the best-matching one, plus a few found by meaning, within a fixed size limit.
From the record
- In technical terms
- After the keep step, append the top article's neighbour chunks + ≤ 2 dense candidates under +600 prompt tokens: +0.066 (+0.043…+0.091) Opus on the 180 (dev); inert on the claim kit.
Linked facts · 1
- The one retrieval change that converted: append the retrieved article's neighbouring chunks plus a few vector-search candidates, under a 600-token budget (HEADPASS-X2b).The one retrieval change that converted: append the retrieved article's neighbouring chunks plus a few vector-search candidates, under a 600-token budget (HEADPASS-X2b).Opus +0.066 (+0.043…+0.091); Haiku +0.056; fact chunk present in context 35 → 102 of 180Set180 pack self-testsStatusdev (designed on the same set)JudgeClaude Opus (judge.v1, both orders)n180Seeds1Date2026-10-14CaveatLEVER on pack-matched dev data only; inert on the claim kit (ceiling ≈ 0.011) and not a bounty-bar lever.Sourceresearch record
arms/headpass-st/HEADPASS-ST.md:57research recordarms/headpass-st/HEADPASS-ST.md:89research recordreports/REPORT-PACKS-2026-10-13.md:21research recordarms/headpass-st/HEADPASS-ST.md:57,89research recordarms/headpass-stOpen the data file