# Hugging Face — Welcome Beam: a 501B open model you can own, customize, and scale

- Company: Hugging Face (huggingface.co)
- Announced: 2026-10-16
- Category: new-model
- Coverage: not counted
- Announcement: yes
- Group: models
- Source: https://huggingface.co/blog/reflection-beam
- Record: https://forck.live/items/23502-welcome-beam-a-501b-open-model-you-can-own-customize-and-scale
- Subject: Platform
- Open weights: yes
- Models affected: Beam
- License: Apache 2.0
- Context window: 1M tokens

Reflection released Beam, a 501B-parameter mixture-of-experts model with 23B active parameters per token, supporting a 1M token context window and released under the Apache 2.0 license. The model is focused on coding and agentic use cases, and ships with a Rust-based custom harness as well as day-0 support in transformers, SGLang, and vLLM. Reflection is offering $10,000 in Hub credits for the best projects built with Beam.

## Evidence

Verbatim from https://huggingface.co/blog/reflection-beam:

> Beam by Reflection is out on Hugging Face! It is the first model from the new US lab, Reflection, and it’s open! It's a mixture-of-experts (MoEs) model with 501B parameters (23B active per token), supports text as input, has a context window of 1M tokens , and is released under the Apache 2.0 license.

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Record: https://forck.live/items/23502-welcome-beam-a-501b-open-model-you-can-own-customize-and-scale
Catalogue: https://forck.live/llms.txt
Current issue: https://forck.live/feed.md