Beam 1.0 501B A23B
reflection/beam-1.0-501b-a23bBeam 1.0 is Reflection AI's open-weight coding and agentic reasoning model, a sparse mixture-of-experts with 501B total and 23B active parameters, a 1M-token context window, and an Apache 2.0 license. Reflection reports 80.9% on SWE-bench Verified (self-reported), positioning it as a low-cost open option for software engineering and agent work.
Cost rate
0.2x
Context
1M
Released
Oct 16, 2026
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Output
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ReasoningTool callingStructured outputs
Best at
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