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Os-Marathon Agent Benchmarking: 242 Long-Horizon Tasks Performance

Summary of the OS-Marathon Benchmark Research This research introduces OS-Marathon, a new benchmark designed to evaluate the performance of Conversational Understanding Agents (CUAs) on long-horizon, repetitive tasks.Existing benchmarks primarily focus on short-term tasks, leaving a gap in assessing…

Os-Marathon Agent Benchmarking: 242 Long-Horizon Tasks Performance

Summary of the OS-Marathon Benchmark Research

This research introduces OS-Marathon, a new benchmark designed to evaluate the performance of Conversational Understanding Agents (CUAs) on long-horizon, repetitive tasks.Existing benchmarks primarily focus on short-term tasks, leaving a gap in assessing agents’ ability to handle complex, multi-step workflows common in real-world professional settings.

Key Findings & Features:

* Failure Modes: Leading CUAs struggle with three primary issues:
* Logical Incoherence: Incorrect ordering of tasks.
* Hallucination: Generating actions not grounded in reality.
* Inconsistency: Failing to maintain context and consistency across repetitive sub-workflows.
* Domains: The benchmark utilizes two realistic domains:
* Expense Report System: Automating expense report processing.
* GPA Calculator: Automating GPA calculation from transcripts.
* Difficulty Levels: Tasks are designed with varying horizon lengths and document complexity (Levels 1-4) to provide fine-grained evaluation.
* Execution Environments: Agents operate within both web-based systems and local spreadsheet applications, creating a realistic testing ground.
* Novel Metric: Sub-Workflow Accuracy (SWA): A new metric (n/N) to measure performance on extended action sequences, going beyond simple success/failure rates.
* Exhibition Method: A technique to create condensed demonstrations from few examples, enabling agents to generalize to larger, unseen datasets.
* Improved Performance: Combining the demonstration method with AgentS2.5 and GPT-5 significantly improved agent performance.
* Data Generation: Synthetic receipts were generated using LLMs,and the Transcript domain includes both real and synthetic data.

OS-Marathon provides a standardized and challenging benchmark for evaluating and improving CUAs’ ability to handle complex, long-horizon tasks, highlighting the need for advancements in long-horizon reasoning and consistency.

Resources: The project website is available at github. io/.

About the author: Anika Shah - Technology

MSc in Computer Science, senior reporter. Anika focuses on AI ethics, cybersecurity, and emerging hardware—frequently moderating panels at CES and Web Summit. “Anika Shah decodes tech breakthroughs and startup disruption shaping tomorrow’s digital landscape.”