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Beam

Reflection AI's 501B open-weight model for coding and agent work

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What it does

Beam is Reflection AI's first open-weight model, a sparse mixture-of-experts with 501B parameters (23B active), text only, with a 1M-token context, aimed at coding, reasoning and long agent runs. Weights are on Hugging Face under Apache 2.0 in BF16, FP8 and NVFP4, and Reflection serves it through its own API and partner clouds.

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