Towards Data Science

Same Answer, Different Reason: What a Reasoning Model Says When It Follows a Planted Hint

The article examines how a small reasoning model responds when presented with incorrect answers to 200 exam questions. By inserting wrong answers and observing the model’s reasoning, the author explores whether the model’s justification aligns with the planted hint or diverges. The study highlights the model’s tendency to follow misleading cues and the implications for evaluating its reasoning process.

Towards Data Science
Sep 2

A RAG That Says “Not in This Document” Has to Show Four Kinds of Evidence

The article discusses the importance of a Retrieval-Augmented Generation (RAG) system providing clear evidence when it states that information is not present in a document. It outlines four distinct types of evidence that should accompany such a claim to avoid presenting a confident but incorrect answer or an unsupported “no answer.” The piece emphasizes that each evidence type serves as a safeguard against misinformation in enterprise document intelligence.

By Kezhan Shi
arXiv AI
Oct 16

When Reasoning Traces Conflict with Evidence: How Answer Configuration Shapes Evidence Following

The study investigates how a retained reasoning trace influences answer accuracy and its interaction with evidence. By comparing two answer configurations—continuation of the model’s own thinking versus a separate answer call—across GPT‑OSS, Gemma4, and Qwen3 on HotpotQA and MuSiQue, the authors find that the separate call significantly improves evidence‑following while the trace itself remains crucial for accuracy. The analysis also reveals that the final line of a trace is most valuable, that gold evidence aids early reasoning, and that distractors weaken correction under a separate call.

By Shaoang Li, Yanhang Shi, Jian Li
Towards Data Science
1d ago

Why a Tiny GPT Can Know Two Facts and Still Not Connect Them

A tiny GPT model was trained to memorize every fact presented to it, yet it failed to answer any question that required combining two of those facts. The author tested a one-line fix suggested in a recent paper, which only partially resolved the issue. The post highlights the limitations of small language models in integrating multiple pieces of information.

By Utkarsh Mangal
arXiv AI
Oct 16

Does Latent Chain-of-Thought Actually Reason? A Single, Unifying Taxonomy for Latent Reasoning

The paper investigates whether latent chain-of-thought (latent CoT) models truly perform reasoning by examining twenty-one model-task configurations across different training recipes, tasks, and backbones. Using chain deletion, content replacement, probes, and trajectory analysis, the authors find that on logical tasks the latent chain often contains an answer before the chain starts and can be deleted with little effect, while on arithmetic tasks the chain’s content is essential. The study introduces a taxonomy that distinguishes what a chain represents from how a model uses it, clarifying that readable latent states alone do not prove reasoning.

By Jingjie Qiu, Sheldon Yu, Xunyi Jiang, Jiajin Liu, Zihan Huang, Zhendong Chu, Tong Yu, Julian McAuley, Junda Wu
arXiv Machine Learning
4d ago

Does Reasoning Make Language Models Agree?

The paper investigates how reasoning affects agreement among language models. It distinguishes reasoning as an intervention from reasoning as an observed behavior, comparing agreement under controlled changes in reasoning effort versus observed reasoning lengths. Across nine models and three classification tasks, enabling reasoning increases agreement on the same individuals, while longer reasoning traces correlate with less consistent predictions across models.

By Mila Gorecki, Moritz Hardt
Towards Data Science
Oct 29

Is the #1 AI Model Really #1?

The article examines the performance of AI models on a 2,000-question test, finding that the top two models were indistinguishable at the conventional 5% significance level. When the test was reduced to 200 questions, a different model would have claimed first place roughly three times out of ten trials. The piece questions the reliability of declaring a single model as the best based on limited testing.

By Utkarsh Mangal