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US-based Reflection's Beam open-source LLM released with 501B parameters

By PulseAugur Editorial · [1 sources] ·

A new US-based open-source large language model, named Reflection's Beam, has been released. It boasts 501 billion parameters, with 23 billion actively used, and is licensed under the Apache 2.0 license. While it outperforms other Western open-source models, it is noted to be slower than models like GLM 5.3, Kimi K3, and DeepSeek V4.1. AI

IMPACT This release introduces a new large-scale open-source model, potentially fostering further development and competition in the LLM space.

RANK_REASON New open-source model release from a US-based entity. [lever_c_demoted from frontier_release: ic=1 ai=1.0]

Read on Mastodon — mastodon.social →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

US-based Reflection's Beam open-source LLM released with 501B parameters

How we ranked this

Signal score
3 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
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Significant
New open-source model release from a US-based entity. [lever_c_demoted from frontier_release: ic=1 ai=1.0]
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Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
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model release, product
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High
Clearly on-topic for AI-industry coverage.
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Breaking (< 6h)
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COVERAGE [1]

  1. Mastodon — mastodon.social TIER_1 English(EN) · mohith808 ·

    the US open model built to rival china dropped yesterday reflection's beam: 501B params, 23B active, apache 2.0 in its own table it beats every western open mod

    the US open model built to rival china dropped yesterday reflection's beam: 501B params, 23B active, apache 2.0 in its own table it beats every western open model but trails glm 5.3, kimi k3 and deepseek v4.1 flash on every shared row catching up is a start. rival is early weight…

    LINKS reflection.ai/…/introducing-beam

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