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Reflection-Beam-1.0 gets Day-0 support in vLLM
- Who
- vLLM
- What
- added Day-0 support serving Reflection-Beam-1.0 with fused kernels and DFlash
- When
What happened
Reflection-Beam-1.0 from @reflection_ai has Day-0 support in vLLM. 501B total parameters, 23B active per token, and a 1M-token context window. Beam combines hybrid attention with Harmony-format reasoning and tool use. Beam also has Day-0 RL support in SkyRL (@NovaSkyAI)
Links in the post: 2Why it matters
Day-0 support in vLLM and SkyRL connects Beam’s release to inference and RL workflows, providing concrete context for developers considering how to run or train with the model.
2 reports
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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