Tech AI LatestReflection AI releases Beam weights: a 501B open model under Apache 2.0 with 1M context
Reflection AI released Beam on 16 October 2026: a 501B mixture-of-experts model with 23B active parameters, 1M context and Apache 2.0 weights.
Summary
Reflection AI released the weights of Beam, its first open-weight model, on 16 October 2026 under the Apache 2.0 license. Beam is a text-only mixture-of-experts model with 501B total and 23B active parameters and a 1M-token context, built for coding, reasoning and agentic work. The release follows the 5 October announcement and includes BF16, FP8 and NVFP4 weights, a model card, a safety report and a public beta of the Reflection API.