Reflection AI open-sources Beam: 501B-param MoE model under Apache 2.0 for agentic coding
arena · x · 2026-10-16
Reflection AI released Beam 1.0, its first open-weight model, with weights on Hugging Face under Apache 2.0.
Key points:
- Sparse MoE with 501B total / 23B active parameters, built for advanced coding, reasoning, and long-horizon agentic workloads
- Ships with a model card (final benchmarks) and a Beam Safety Technical Report covering its full safety methodology
- Launched with 40+ partners and integrations as an "open operating system for agents": the model is the kernel, and everything above the infrastructure layer is open — reference agentic integrations, deployment containers, inference integrations, customization pipelines
- Developers can self-host, evaluate, and customize, or use it via Reflection's API
Early demos include an escape room by CoreWeave's Lorenzo Balderrama Porras where Beam repairs a planetary machine and routes light.
Related event: Reflection Open-Sources Beam-1.0, a 501B-Parameter MoE with 1M Context(20 posts)→
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