Why Beam’s 501B Model Is Really About Efficiency
artificial intelligence Oct 06, 2026 5 min read

Why Beam’s 501B Model Is Really About Efficiency

Reflection’s Beam is a 501-billion-parameter sparse Mixture-of-Experts model with 23 billion active parameters. Its larger story is efficiency: high-compute reinforcement learning, long tool-using rollouts, and controllable reasoning aim to make coding agents capable without paying dense-model costs on every token.

by ahsan