Reflection-Beam-1.0 gets Day-0 support in vLLM

What happened

Reflection-Beam-1.0 has Day-0 support in vLLM, with 501B total parameters, 23B active per token, and a 1M-token context window. Beam combines hybrid attention with Harmony-format reasoning and tool use, and has Day-0 RL support in SkyRL through LoRA, BF16 full fine-tuning and MXFP8 RL, with vLLM rollouts. vLLM worked with Reflection and Inferact on the serving path, from fused kernels to DFlash.

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The story so far

Reflection released its first model, Reflection-Beam-1.0, as an open weights model on Hugging Face, with launch-day serving support in vLLM. Artificial Analysis gave Beam a score of 30 on its Intelligence Index, placing it second among US open weights models. Beam has 501B total parameters, 23B active per token and a 1 million-token context window. It combines hybrid attention with Harmony-format reasoning and tool use. vLLM said it worked with Reflection and Inferact on serving optimizations, including fused kernels and DFlash. SkyRL also provides launch-day reinforcement learning support through LoRA, BF16 full fine-tuning and MXFP8 RL, using vLLM rollouts.

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