LMArena open-sources its leaderboard engine Arena-Rank
LMArena just open-sourced Arena-Rank, the standalone Python package behind its widely watched AI model leaderboards. Rewritten with a JAX backend, the toolkit calculates rankings over 30x faster than before and introduces reweighting to fairly evaluate models with fewer match records. Beyond LLM evaluations, it can also rank head-to-head match data in sports and gaming.