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Reflection AI has released the open weights and post-training recipes for Beam, its 501B MoE coding model, under Apache 2.0. Google Cloud, AWS, vLLM, and Ollama delivered day-0 optimizations including DFlash2 speculative decoding, tiered KV caches, and NVFP4 checkpoints.
Reflection AI's first model is a 501B-parameter, 23B-active Apache 2.0 MoE with a 1M-token context, built for coding agents. What shipped, what it takes to host, and the four fastest ways to run it today.
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