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Sijun Tan

5 accepted papers

2026

Auditing Black-Box LLM APIs with a Rank-Based Uniformity Test

ICLR 2026poster

As API access becomes a primary interface to large language models (LLMs), users often interact with black-box systems that offer little transparency into the deployed model. To reduce costs or maliciously alter model behaviors, API providers may discreetly serve quantized or fine-tuned variants, wh…

Cited by 0SourcecodeScholar
2026

V1: Unifying Generation and Self-Verification for Parallel Reasoners

ICML 2026poster

Test-time scaling for complex reasoning tasks shows that leveraging inference-time compute, for example by independently sampling and aggregating multiple solutions, results in significantly better task outcomes. However, a critical bottleneck is _verification_: sampling is only effective if correct…

Cited by 0SourceScholar
2025

JudgeBench: A Benchmark for Evaluating LLM-Based Judges

ICLR 2025poster

LLM-based judges have emerged as a scalable alternative to human evaluation and are increasingly used to assess, compare, and improve models. However, the reliability of LLM-based judges themselves is rarely scrutinized. As LLMs become more advanced, their responses grow more sophisticated, requirin…

2024

LLoCO: Learning Long Contexts Offline

EMNLP 2024main

Processing long contexts remains a challenge for large language models (LLMs) due to the quadratic computational and memory overhead of the self-attention mechanism and the substantial KV cache sizes during generation. We propose LLoCO, a novel approach to address this problem by learning contexts o…