LiveBench: A Challenging, Contamination-Free LLM Benchmark
Authors: name: Colin White, name: Samuel Dooley, name: Manley Roberts, name: Arka Pal, name: Ben Feuer, name: Siddhartha Jain, name: Ravid Shwartz-Ziv, name: Neel Jain, name: Khalid Saifullah, name: Siddartha Naidu, name: Chinmay Hegde, name: Yann LeCun, name: Tom Goldstein, name: Willie Neiswanger, name: Micah Goldblum

Test set contamination, wherein test data from a benchmark ends up in a newer
model's training set, is a well-documented obstacle for fair LLM evaluation and
can quickly render benchmarks obsolete. To mitigate this, many recent
benchmarks crowdsource new prompts and evaluations from human or LLM judges;
however, these can introduce significant biases, and break down when scoring
hard questions. In this work, we introduce a new benchmark for LLMs designed to
be immune to both test set contamination and the pitfalls of LLM judging and
human crowdsourcing. We release LiveBench, the first benchmark that (1)
contains frequently-updated questions from recent information sources, (2)
scores answers automatically according to objective ground-truth values, and
(3) contains a wide variety of challenging tasks, spanning math, coding,
reasoning, language, instruction following, and data analysis. To achieve this,
LiveBench contains questions that are based on recently-released math
competitions, arXiv papers, news articles, and datasets, and it contains
harder, contamination-free versions of tasks from previous benchmarks such as
Big-Bench Hard, AMPS, and IFEval. We evaluate many prominent closed-source
models, as well as dozens of open-source models ranging from 0.5B to 110B in
size. LiveBench is difficult, with top models achieving below 65% accuracy. We
release all questions, code, and model answers. Questions will be added and
updated on a monthly basis, and we will release new tasks and harder versions
of tasks over time so that LiveBench can distinguish between the capabilities
of LLMs as they improve in the future. We welcome community engagement and
collaboration for expanding the benchmark tasks and models.