PlanBench-XL Tests LLM Agents on Long-Horizon Tool Planning
June 23, 2026
PlanBench-XL is an evaluation framework for LLM tool-use agents operating across large-scale tool ecosystems, targeting long-horizon planning tasks. It addresses gaps in existing benchmarks that test only shallow, single-step tool calls.
HOW THIS AFFECTS YOU
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builderWorth tracking if you're building multi-step tool-use agents and need a rigorous eval harness.
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researcherUseful reference benchmark if you're evaluating agent planning depth across many tools.