Adaptive Testing for LLMs: Does It Really Work?
The standard approach to evaluating large language models (LLMs) is simple but inefficient: run models through massive static benchmarks, average the scores, and compare results. The problem is that these benchmarks often require models to process thousands of items, many of which offer little useful information about a model's actual capabilities.
Computerized Adaptive Testing (CAT) has been quietly transforming educational assessments for decades [1, 2, 3]. Rather than using a one-size-fits-all test, CAT adapts question difficulty in real time based on the test-taker’s performance. The concept is intuitive: start with a medium-difficulty question. If the answer is correct, try something harder. If it’s wrong, step back. In this way, the test adapts continually to pinpoint the test-taker’s ability efficiently.