Beam is Reflection's first open-weight model: a sparse Mixture-of-Experts system with 501 billion total parameters and 23 billion active per token, trained for coding, reasoning and agentic workloads. The weights are published on Hugging Face for anyone to download and run.
Reflection pairs the open release with a hosted API platform for teams that want Beam without operating their own infrastructure, and publishes a model card covering capability, pretraining and its safety and alignment approach.
