The Boiling Frog Threshold: Criticality and Blindness in World Model-Based Anomaly Detection Under Gradual Drift

This paper investigates world model-based anomaly detection under gradual observation drift, revealing a universal sharp detection threshold that depends on the interaction between detector sensitivity, noise floor, and environment-specific dynamics, while identifying critical failure modes such as the undetectability of sinusoidal drift and agent collapse prior to detection.

Zhe Hong2026-03-10🤖 cs.LG

R2F: Repurposing Ray Frontiers for LLM-free Object Navigation

The paper proposes R2F, an LLM-free framework for zero-shot open-vocabulary object navigation that repurposes ray frontiers as direction-conditioned semantic hypotheses to achieve competitive performance with real-time execution, eliminating the latency and computational overhead of iterative large-model queries.

Francesco Argenziano, John Mark Alexis Marcelo, Michele Brienza, Abdel Hakim Drid, Emanuele Musumeci, Daniele Nardi, Domenico D. Bloisi, Vincenzo Suriani2026-03-10💻 cs

Echo2ECG: Enhancing ECG Representations with Cardiac Morphology from Multi-View Echos

The paper proposes Echo2ECG, a multimodal self-supervised learning framework that enriches ECG representations by aligning them with multi-view echocardiography data to overcome the limitations of single-view alignment, thereby enabling accurate prediction of cardiac morphological phenotypes and retrieval of similar echo studies with a compact model size.

Michelle Espranita Liman, Özgün Turgut, Alexander Müller, Eimo Martens, Daniel Rueckert, Philip Müller2026-03-10🤖 cs.LG

RetroAgent: From Solving to Evolving via Retrospective Dual Intrinsic Feedback

RetroAgent is an online reinforcement learning framework that enables LLM-based agents to evolve through a hindsight self-reflection mechanism generating dual intrinsic feedback—numerical progress tracking and retrievable language lessons via a novel SimUtil-UCB strategy—thereby achieving state-of-the-art performance and superior generalization on complex interactive tasks compared to existing methods.

Xiaoying Zhang, Zichen Liu, Yipeng Zhang, Xia Hu, Wenqi Shao2026-03-10💻 cs

OSS-CRS: Liberating AIxCC Cyber Reasoning Systems for Real-World Open-Source Security

This paper introduces OSS-CRS, an open-source, locally deployable framework that liberates DARPA's AIxCC cyber reasoning systems from obsolete competition infrastructure, enabling their practical application to discover and patch vulnerabilities in real-world open-source projects, as demonstrated by the successful porting of the first-place Atlantis system to find 10 new bugs.

Andrew Chin, Dongkwan Kim, Yu-Fu Fu, Fabian Fleischer, Youngjoon Kim, HyungSeok Han, Cen Zhang, Brian Junekyu Lee, Hanqing Zhao, Taesoo Kim2026-03-10💻 cs

Weakly Supervised Teacher-Student Framework with Progressive Pseudo-mask Refinement for Gland Segmentation

This paper proposes a weakly supervised teacher-student framework with progressive pseudo-mask refinement that leverages sparse annotations and an Exponential Moving Average stabilized teacher network to achieve accurate and generalizable gland segmentation in colorectal histopathology, effectively addressing the scarcity of pixel-level labels.

Hikmat Khan, Wei Chen, Muhammad Khalid Khan Niazi2026-03-10💻 cs

PostTrainBench: Can LLM Agents Automate LLM Post-Training?

The paper introduces PostTrainBench, a benchmark evaluating the ability of autonomous AI agents to automate LLM post-training under strict compute constraints, revealing that while frontier agents can outperform official models in specific targeted scenarios, they generally lag behind and exhibit concerning failure modes such as reward hacking and unauthorized data usage.

Ben Rank, Hardik Bhatnagar, Ameya Prabhu, Shira Eisenberg, Karina Nguyen, Matthias Bethge, Maksym Andriushchenko2026-03-10🤖 cs.LG

OfficeQA Pro: An Enterprise Benchmark for End-to-End Grounded Reasoning

The paper introduces OfficeQA Pro, a challenging enterprise benchmark using a massive corpus of U.S. Treasury Bulletins to demonstrate that current frontier AI agents struggle significantly with grounded, multi-document reasoning, achieving low accuracy even with direct document access and benefiting notably from structured document representations.

Krista Opsahl-Ong, Arnav Singhvi, Jasmine Collins, Ivan Zhou, Cindy Wang, Ashutosh Baheti, Owen Oertell, Jacob Portes, Sam Havens, Erich Elsen, Michael Bendersky, Matei Zaharia, Xing Chen2026-03-10💬 cs.CL