AssayBench: An Assay-Level Virtual Cell Benchmark for LLMs and Agents. - Edward De Brouwer; Carl Edwards; Alexander Wu; Jenna Collier; Graham Heimberg; Xiner Li; Meena Subramaniam; Ehsan Hajiramezanali; David Richmond; Jan-Christian Hütter; Sara Mostafavi; Gabriele Scalia (CoRR, 2026)