Chenghao Yang (@chrome1996) / X

Chenghao Yang

238 posts

Chenghao Yang

@chrome1996

Senior AS @Microsoft. Ph.D. @UChicago Ex-SR @google Ex-Scientist @AWS. Ex-RA @jhuCLSP @columbianlp @TsinghuaNLP. Ex-Intern @IBM @AWS. Opinions are my own.

Redmond, WA

yangalan123.github.io

Born December 16, 1996

Joined March 2017

Pinned
Chenghao Yang
@chrome1996
Jun 24, 2025
Have you noticed… 🔍 Aligned LLM generations feel less diverse? 🎯 Base models are decoding-sensitive? 🤔 Generations get more predictable as they progress? 🌲 Tree search fails mid-generation (esp. for reasoning)? We trace these mysteries to LLM probability concentration, and
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Chenghao Yang
@chrome1996
Jun 15
Excited to contribute to this work! 👁️📝 As someone relatively new to the multimodal world, I've always wanted to explore how we can better ground LLMs. But before diving deep into modeling, I believe we need a better understanding of what our benchmarks are actually evaluating.
Harvey Yiyun Fu
@harveyiyun
Jun 15
Seeing👀 is not reasoning🤔? Introducing our new blog post. We tested 8 open VLMs on 9 VQA benchmarks, and found that a lot of "visual" accuracy isn't visual at all. Many benchmarks can be solved without ever looking at the image, and some VLMs reason better from text than from
Chenghao Yang
@chrome1996
Apr 29
What happens when we build an "AI society" with LLMs? Turns out, it's far more stereotyped than we thought. 🤖📉 Excited to share our new work on Persona Collapse—where distinct AI agents regress into narrow behavioral modes. Surprisingly, the models with the highest per-persona
Lorenzo Xiao
@lrzneedresearch
Apr 28
We have some concerns about the current state of LLM-based social simulation. We benchmarked 10 LLMs on persona simulation. Every model collapses. The "best" ones are the worst offenders. And RLHF actively makes it worse. arxiv.org/pdf/2604.24698
Chenghao Yang
@chrome1996
Mar 21
BranchingFactor v1.1 just dropped! 🚀 (Yes — it’s an actively updated paper.) (arxiv.org/abs/2506.17871) As models rely more on post-training, understanding the synergy between pre-training and alignment becomes crucial. Branching Factor (BF) offers a simple way to track the
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Chenghao Yang
@chrome1996
Jan 30
I will be doing my PhD defense today! Come and learn about my Grounded Alignment works! Detailed information (w/Zoom) below: Candidate: Chenghao Yang Date: Friday, January 30, 2026 Time: 2 pm CST Location: John Crerar Library 298 Zoom: uchicago.zoom.us/j/96014992390?… Meeting ID: