Maarten Sap

@maartensap.bsky.social

Working on #NLProc for social good. Currently at LTI at CMU. 🏳‍🌈

Did you know gifting four koi 🐟 is offensive in Japan (4 = "shi" = death 💀), or that chopsticks 🥢upright in rice is inappropriate in China (like funeral incense 🕯️)? Top VLMs don't! Our #COLM2026 paper introduces 🌏NormViz to measure visual norm understanding in 16 countries. Best model: 25.3% 🚨 🧵👇

Overview of NORMVIZ-BENCH for visual norm understanding, consisting of 3,272 contrastive image pairs across 16 countries that differ only in the culturally relevant behavior. (a) A contrastive pair example from Japan; group accuracy requires a model to correctly classify both images in a pair. (b) Images are sourced via Text-to-Image generation,
inpainting, and Retrieval. (c) Benchmark statistics and pair type distribution.

Is the safety-capability tradeoff for LLMs real? Or could it be an artefact of the benchmarks we use to measure safety?? We did some explorations with psychometrics-inspired multi-dimensional IRT models and created BenchMIRT to explore these questions! See 🧵

Ai2@ai2.bsky.social · last mo.

Do LLM safety & capability evals measure what they claim to? We built BenchMIRT to audit them + see which model abilities their Qs actually test. On BBQ, a social-bias eval, it found the Qs distinguished models more by reasoning ability than safety. 🧵 buff.ly/bTcvqJf

LLMs refuse ambiguous queries that look harmful but aren't. Can they recover once users clarify, while staying safe? Our new interactive multi-turn benchmark measures both. 🚨 Turns out: not both at once.

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🚀 Apply to CMU LTI’s Summer 2026 “Language Technology for All” internship! 🎓 Open to pre‑doctoral students new to language tech (non‑CS backgrounds welcome). 🔬 12–14 weeks in‑person in Pittsburgh — travel + stipend paid. 💸 Deadline: Feb 20, 11:59pm ET. Apply → forms.gle/cUu8g6wb27Hs...

CMU LTI Summer 2026 Internship Program Application

We are looking for applicants for the Carnegie Mellon University Language Technology Institute's Summer 2026 "Language Technology for All" internship program. The main goal of this internship is to pr...

forms.gle

I'm excited to announce the Call for Papers for the Social Context (SoCon) and Integrating NLP and Psychology to Study Social Interactions (NLPSI) workshop, @ LREC '26 in Palma de Mallorca, Spain! 🗓Deadline: February 16, 2026 🌐Website: socon-nlpsi.github.io 🗓Workshop: May 12, 2026

SoCon-NLPSI'26 | Home

Natural Language Processing (NLP) has undergone a significant evolution, opening up the possibility of capturing high-level aspects of human communication. Key areas of interest include the pragmatics...

socon-nlpsi.github.io

🚨New paper: Reward Models (RMs) are used to align LLMs, but can they be steered toward user-specific value/style preferences? With EVALUESTEER, we find even the best RMs we tested exhibit their own value/style biases, and are unable to align with a user >25% of the time. 🧵

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📢 New #COLM2025 paper 📢 Standard benchmarks give every LLM the same questions. This is like testing 5th graders and college seniors with *one* exam! 🥴 Meet Fluid Benchmarking, a capability-adaptive eval method delivering lower variance, higher validity, and reduced cost. 🧵

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Ai2@ai2.bsky.social · last yr.

🚀 Introducing Fluid Benchmarking—an adaptive way to evaluate LLMs. Inspired by psychometrics, it tailors which questions to ask based on each model’s capability, making evals more efficient & reliable. 🧵

I'm excited cause I'm teaching/coordinating a new unique class, where we teach new PhD students all the "soft" skills of research, incl. ideation, reviewing, presenting, interviewing, advising, etc. Each lecture is taught by a different LTI prof! It takes a village! maartensap.com/11705/Fall20...

LTI 11-705 Introduction to Research in Language Technologies (Fall 2025)

maartensap.com

Language Technologies Institute | CMU@ltiatcmu.bsky.social · last yr.

Happy first day of classes to all our students, new and returning! Wishing everyone a happy and enlightening fall semester.