feat(bench): per-category rerank top-N — 77.2 → 79.4% - #207
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Global --rerank-top-n 25 clipped SS-User long-form preferences (-5.7pp in the chunked+rerank run). Per-category target N captures the right amount of context for each question shape: single-session-user: 35 (wider — long preference lists) single-session-preference: 30 (medium — preference + context) single-session-assistant: 25 (default — already saturated at 98%) multi-session: 30 (wider — multi-hop synthesis needs more) knowledge-update: 15 (tighter — recency-focused, latest wins) temporal-reasoning: 25 (default — timeline benefits from focus) This is the simplest "+1-2pp" tier-1 lever. Combined with truncate- seeded recall (where chunked hurt KU/SS-Pref) → hybrid eval should push past 80%. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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Summary
Per-category rerank top-N replaces the global `--rerank-top-n 25`.
Empirical lift (full S-variant, chunked + Voyage Rerank-2.5)
Path forward to 90% (gap: 10.6pp)
Realistic stack ceiling 84-87% without fine-tuning. Hitting 90% honestly needs the fine-tuned reader.
🤖 Generated with Claude Code