Reflection gives away Beam’s 501B weights under Apache 2.0, days after Nvidia came calling
Reflection released the weights for Beam, its first open model, on Hugging Face on Friday under Apache 2.0: 501 billion total parameters, 23 billion active per token, 52 layers with 256 experts each and eight routed, a 1M-token context, text in and text out. The download ships in BF16, FP8 and NVFP4 with a DFlash2 speculative-drafting model, day-0 support in transformers, vLLM and SGLang, full-parameter reinforcement learning through Miles, and a Rust harness built for it, launched alongside more than 40 distribution and tooling partners.
Beam was pretrained on 23.8 trillion tokens, then post-trained with a four-week reinforcement-learning run across 10.5K NVIDIA GB300 GPUs that produced more than 100 million rollouts over roughly 1.3 billion sandboxes. Reflection’s pitch is efficiency rather than raw capability: it reports reasoning comparable to GLM-5.2 at three to four times less inference compute, and says Beam stays behind Kimi K3 on raw capability while winning on intelligence per token.

WHY IT MATTERS
The significance is the license and the timing. Apache 2.0 is the most permissive widely used open license, with no revenue gate at all - not even the $20 million service clause attached to Meta’s 816B launch - so a frontier-scale 501-billion-parameter model is now downloadable and self-hostable with no strings and a cost floor set by your own hardware. That it landed six days after the Financial Times reported Nvidia was in talks to acquire the lab is the week’s sharpest irony: the open-weights asset the US ecosystem has been missing is being given away as the company that sells the silicon moves to own it. The caveat gets one line: the benchmarks and the efficiency claims are Reflection’s own, and Beam is text-only.











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