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#search-agent

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01 ·Training & Alignment·★ MEMBER·PAPER·11 min read Paper Deep-Dive: ABSeeker — Training Long-Horizon Search Agents by Grading Each Step Backward from the Answer When an agent chains dozens of web searches, the only reward is whether the final answer was right — so every good move and every bad move along the way gets graded identically. We walk through ABC (Answer-Backtracked Credit Assignment), which recovers clues by working backward from the answer and scores every step against them, and ABSeeker, the 4B model trained with it — all from the paper itself.