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Reflection releases Beam 501B open weights under Apache 2.0

Reflection AI released Beam 501B model weights on October 16, following its earlier preview announcement. It provides BF16, FP8 and NVFP4 forms of the 501B total-parameter, 23B active-parameter model, plus a draft model, under Apache 2.0. The release makes self-hosting possible for qualified teams; published benchmark and efficiency claims remain the maker’s claims. This is Reflection’s model, regardless of where other apps later host it.

Reflection AI

Beam 501B

Products

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2 sources

Primary source · October 16, 2026

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