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About
Beam is an open, 501 billion-parameter AI model from Reflection AI, designed for coding and long-running AI agents. Its weights are free to download, run, and modify under an Apache 2.0 licence. This mixture-of-experts model activates about 23 billion parameters per token, helping to keep runtime costs low. Beam handles up to 1 million tokens of context and works mainly in English. Reflection AI pre-trained it on 23.8 trillion tokens, achieving an 81.6% score on SWE-bench Verified coding tests.
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