Reflection Beam — 501B open-weights MoE under Apache 2.0
Reflection released the weights for Beam, its first open-weight model: 501B-parameter MoE trained on 23.8T tokens with an RL run of 100M+ rollouts, now on Hugging Face with day-0 support across 40+ partners and a public beta of its first-party API.
Why it matters
Apache 2.0 licensing on a 500B-class agentic model trained at frontier scale; vendor positions it as the kernel of an 'open operating system for agents' with reference agentic integrations and deployment containers.
What you could build with it
An agent-platform startup could self-host Beam under Apache 2.0 as the default reasoning engine for long-horizon coding agents, avoiding per-token API bills while keeping weights on its own infrastructure.
Does it hold up?
Too early to judge — weights landed today; real-world usage evidence pending.
Learn more
First spotted on article: source.
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