Reflection AI introduced Beam on October 5, 2026, its first open-weight model: a sparse Mixture-of-Experts system with 501 billion total parameters and 23 billion active, built for coding, reasoning, and agentic workloads. Beam is undergoing final red-teaming and evaluations, and an early version is being offered to a select group of users through a waitlist. Reflection described Beam as the first model in a series and said it is already training what comes next. Capability and Efficiency…
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