Reflection calls Beam a 501B open-weight model. Its own post says the weights come later this month.
Reflection AI announced Beam, a 501 billion parameter Mixture-of-Experts model with 23 billion active, as its first open-weight model.
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Open the evidence3 source pages +
The claim we checked
Reflection's Beam is a 501B open-weight model, competitive with larger open models on coding and agentic tasks.
These are quoted receipts, not a count of independent investigations. Several reports may rely on the same original source.
Beam is a sparse Mixture-of-Experts model with 501 billion total parameters, 23 billion active
We will release the weights, technical report, model card, and developer artifacts later this month.
Open model that is not yet open or widely accessible via API.
the frontier open-weight model at the center of its pitch still has not been released publicly