A Lab Just Open-Sourced Its Training Harness (Plus 501B Weights)
Reflection AI dropped Beam this week — 501 billion parameters of open weights under Apache 2.0. That's the headline. But here's what actually caught my eye: they also open-sourced Mirror CLI, their actual training harness. Meta never did that with Llama. I haven't run Beam myself — no independent b…
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- 2026-10-17 13:13 · DEV Community — Machine Learning
A Lab Just Open-Sourced Its Training Harness (Plus 501B Weights)