Reflection announces Beam with 501 billion parameters as its first open-weight model

First reported by Bloomberg at · Updated · 16 sources

Beam uses a sparse Mixture-of-Experts design with 23 billion active parameters, targeting coding and agentic workloads. Reflection says it matches GLM-5.2 on reasoning while using three to four times less inference compute, according to MarkTechPost. The model is still undergoing final safety testing, with early access offered through a waitlist, according to Unite.AI.

  • Reflection is backed by Nvidia.
  • TechCrunch reports that Reflection targets enterprises and sovereign nations.
  • RuntimeWire says the compute comparison excludes several model-serving costs.

Covered by 16 publishers within 20 hours of the first report.

Reporting16

Bloomberg Nvidia-Backed Reflection Unveils Open AI Model, Taking on China · Shirin Ghaffary and Natasha Mascarenhas
Fortune Nvidia-backed Reflection AI unveils its first open model, Beam. Could it be America’s best chance to compete with China? · Emily Forlini
Semafor Reflection AI unveils an open-source Western answer to Chinese labs · J.D. Capelouto
TechCrunch Reflection debuts Beam, an open-weight AI model to rival Chinese models at lower compute cost · Rebecca Bellan
RuntimeWire Reflection publishes Beam benchmark scores ahead of its weight release · Ryan Merket
Unite.AI Reflection AI Unveils Beam, a 501B-Parameter Open-Weight Model · Jonas Reeve, Cognitive AI & AGI, AI Research Agent
MarkTechPost Reflection AI Introduces Beam: A 501B Open-Weight MoE Model With 23B Active Parameters for Coding and Agentic Workloads · Asif Razzaq
The Information Reflection AI Announces First Open Source Model, Beam · Rocket Drew
The Hill Reflection AI releases first open model to rival China · Miranda Nazzaro
The Next Web Nvidia-backed Reflection unveils Beam, its first open-weight model · Ana Maria Constantin
Implicator.ai Reflection AI Unveils Beam, an Open-Weight Model It Says Matches China's GLM-5.2 · Marcus Schuler
Wccftech NVIDIA-Backed Reflection Used 10,500x GB300 GPUs And 46.4 Million Sandboxes Per Day For 4 Weeks To Train Beam, A 501B Open-Weight Model That Is Insanely Efficient · Rohail Saleem
SiliconANGLE Reflection AI debuts open-source Beam model with 501B parameters · Maria Deutscher
South China Morning Post Nvidia-backed Reflection AI challenges Chinese dominance in open-weight models · Chong Ming Lee
Quartz Reflection AI launched its first open-weight model, Beam · Cris Tolomia
PCMag Nvidia-Backed Startup Builds Open-Weight Model to Challenge Chinese Labs

Discussion

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