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Reflection previews Beam, a 501B coding model, with weights promised later

Reflection announced Beam, a sparse 501B-parameter model built for coding and agent work. The company says early access is by signup while red teaming continues; weights, a model card and technical artifacts are promised later in October under Apache 2.0. This is a preview announcement, not a released open-weight model.

Reflection AI

Beam

Models

Published (date only)

Updated

1 source

Primary source · Reflection AI · October 5, 2026

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