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New WHALE method jointly optimizes AI agent weights and harness code

Researchers have developed a new method called WHALE (Weight-Harness Alternating LEarning) to jointly optimize AI agent performance by simultaneously updating model weights and the harness code that manages context and control flow. This approach alternates between updating the model and searching for an improved harness, addressing the bottleneck issue where optimizing one component in isolation limits the other. Experiments using Qwen3.5-2B/4B agents on tasks like SearchQA, mathematical reasoning, and chess puzzles showed WHALE significantly outperformed existing methods, achieving higher accuracy with fewer rollouts. AI

IMPACT This research could lead to more efficient and performant AI agents by improving how model weights and harness code are optimized together.

RANK_REASON The cluster describes a new research paper detailing a novel method for optimizing AI agents.

Read on Hugging Face Daily Papers →

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New WHALE method jointly optimizes AI agent weights and harness code

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COVERAGE [2]

  1. arXiv cs.AI TIER_1 English(EN) · Haechan Kim, Yoonho Lee, Gisang Lee, Chelsea Finn, Kangwook Lee ·

    WHALE: A Simple Recipe for Joint Harness-Weight Optimization

    arXiv:2609.00196v1 Announce Type: cross Abstract: Agent performance depends jointly on the model parameters and the executable harness code that manages context and control flow. Optimizing either component in isolation can leave the system bottlenecked by its frozen counterpart:…

  2. Hugging Face Daily Papers TIER_1 English(EN) ·

    WHALE: A Simple Recipe for Joint Harness-Weight Optimization

    WHALE alternates model weight updates and harness search to jointly optimize agent performance across reasoning tasks.