Reflection Open-Sources 501B-A23B MoE Model Beam and Launches on AWS

On October 6, 2026, Latent Space AINews reported that Reflection released Beam, an open-source model trained from scratch, using a MoE architecture with 501B total parameters and 23B activated parameters, released under the Apache 2.0 license, with full weights planned to be available within that month. On October 16, 2026, Hugging Face Blog (first-hand) reported that Reflection open-sourced its first model Beam on Hugging Face (reflectionai/Beam-1.0-501B-A23B), with parameter scale, MoE architecture, and Apache 2.0 license consistent with earlier reports, noting that the model supports 1M token context and focuses on coding and agent use cases. The same day, AWS Machine Learning Blog (first-hand) reported that the Beam weights model landed on AWS, offering deployment guides for SageMaker JumpStart and HyperPod, positioned for agentic coding and long-horizon tasks with an effective context length of 1 million tokens, weights released via Hugging Face under the Apache 2.0 license, with BF16, FP8, and NVFP4 checkpoints available. All reports are consistent on parameter scale, architecture, license, and context length; earlier reports described Beam as a text-only coding model, while later reports say it focuses on coding and agent use cases. Model weights are now available on Hugging Face and deployable on AWS.

AI overview of reporting · Updated 2 days ago

1. 10/16 23:23 · 1 reports
   Reflection AI Open-Sources Coding Model Beam
   AWS Machine Learning Blog：Introducing Reflection Beam: an open-weight model for agentic coding on AWS
2. 10/16 08:00 · 1 reports
   Reflection Releases 501B Open-Source Model Beam
   Hugging Face Blog：Welcome Beam: a 501B open model you can own, customize, and scale
3. 10/6 14:28 · 1 reports
   Reflection releases open-source model Beam (501B-A23B)
   Latent Space：[AINews] Reflection Beam - 501B-A23B American Open Model

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