Reflection AI debuts open-source Beam model with 501B parameters

Reflection AI released Beam, an open-source large language model with 501 billion parameters.

The company reports that Beam can outperform some tasks compared to GLM-5.2 while using less hardware, and approaches the performance of Qwen 3.8-Max, a model with over 2 trillion parameters.

Beam is initially available through an early access program, with weights and tools to be released later this month.