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Reflection AI Launches Beam, a 501B Open-Weight Model Aimed at Chinese AI Rivals

  • Foundation Models
  • AI Agents
  • Open Source

Reflection AI introduced Beam, its first open-weight frontier model, positioning the 501-billion-parameter system as a U.S.-built challenger to Chinese open models in coding, reasoning and agentic work. The Nvidia-backed startup says Beam activates 23 billion parameters per task and will be released with weights, a technical report, model card and developer artifacts later this month.

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