Reflection unveils Beam, a 501B-parameter open-weight model claiming frontier performance at lower compute
Reflection AI announced Beam, a text-only, open-weight mixture-of-experts model with 501 billion total parameters (23 billion active), a 1 million token context window, and pretraining on 23.8 trillion tokens. The startup says Beam matches top Chinese open models on advanced reasoning benchmarks while using '3–4x less inference compute,' will publish weights and full technical details this month, and is targeting enterprises and sovereign 'AI factory' deployments; the performance claims have not been independently verified.