Reflection Launches Beam 1.0, a 501B Open-Weight MoE Model

Reflection launched Beam, a 501B MoE model, with open weights under the Apache 2.0 license and 40+ ecosystem partners. NVIDIA AI says it was trained on NVIDIA GB300 NVL72 and delivers over 70K tokens/sec/GPU on Blackwell Ultra out of the box on day 0. Reflection’s quoted announcement includes BF16, FP8 and NVFP4 weights, a DFlash2 drafter, and Mirror CLI; the Beam 1.0 NVFP4 checkpoint is available at https://huggingface.co/reflection/Beam-1.0-501B-A23B-NVFP4.

Hugging Face says a livestream with the Reflection team about how they built Beam starts in minutes. Stream: https://t.co/q6OKvCiB9o https://t.co/scNsrfsC3s In the quoted announcement, Reflection says Beam is available across platforms with open weights under Apache 2.0, in collaboration with 40+ partners, including a tokenizer, reference implementation, BF16, FP8 and NVFP4 weights, and a DFlash2 drafter.

Reflection released Beam on Hugging Face, a 501B MoE model with 23B active parameters per token, a 1M-token context window, and an Apache 2.0 license. The text-only model targets coding and agentic work, with BF16, FP8, and NVFP4 checkpoints and day-0 support in transformers, vLLM, and SGLang. Hugging Face provides deployment and post-training recipes alongside its own task evaluations and demos.