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Reflection AI releases open-weight 501B model Beam for agentic coding

Reflection AI has released Apache 2.0-licensed weights for Beam, a 501B-parameter model trained with reinforcement learning to optimize token usage. The model is designed for agentic coding and long-horizon tasks, with deployment options available on AWS.

Read the full story at AWS Machine Learning Blog ↗

Timeline · 3 reports

  1. 2026-10-16 16:40 · Techmeme
    Reflection AI releases Apache 2.0-licensed weights for Beam, a 501B-parameter model, trained with RL that penalized unnecessary tokens
  2. 2026-10-16 15:23 · AWS Machine Learning Blog
    Introducing Reflection Beam: an open-weight model for agentic coding on AWS
  3. 2026-10-16 00:00 · Hugging Face Blog
    Welcome Beam: a 501B open model you can own, customize, and scale

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