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Author

Armaan Sandhu

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#artificial intelligence Preprint Sep 2026

UserProxyBench: Evaluating LLM User Simulators for Agent Benchmarks and Training

UserProxyBench, an evaluation layer over the tau-bench family, and the User Fidelity Score (UFS), which measures adherence to the benchmark's private user instructions using task-grounded rubric criteria scored independently of agent success are introduced.

Ashish Jain, Armaan Sandhu · 2 citations · ⚡1
Preprint Aug 2026

Targeting the Attention Heads Behind Object Hallucination in LLaVA

A diagnosis-to-intervention pipeline for object hallucination is presented, and a controlled account of what acting on the diagnostic signal actually does is presented: it localizes intervention sites with real, non-random leverage, reported as a behavioral profile rather than a single score.

Armaan Sandhu, Abhilasha Senapati, Hima Kammachi · 1 citation
Preprint Aug 2026

Measuring Reward Hacking and Reasoning-Answer Decoupling Under Position-Confounded Optimization

This work trains language models with GRPO on multiple-choice math problems where the correct answer is always option A, then evaluates on an unseen test set with unbiased answer positions to find reasoning-answer decoupling, which separates capability loss from a learned, transferable shortcut.

Suyash Maniyar, Armaan Sandhu, Abhishek Mishra · 0 citations

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