What is Reflection AI's first open-weight model?

Beam, a 501B-parameter sparse mixture-of-experts model with 23B active parameters, announced on 5 October 2026 and released with Apache 2.0 weights on 16 October 2026.

Where can Beam be used?

Reflection publishes the weights on Hugging Face and offers the model through its own API platform, which it says is in public beta, as well as through cloud and hosting partners.

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AI research company

Reflection AI

Reflection AI is a US AI company that says it builds open models for everyone to access, use and build on. Its first open-weight model, Beam, is a 501B-parameter mixture-of-experts model for coding, reasoning and agentic work, released on Hugging Face under Apache 2.0 in October 2026 with a hosted API in public beta.

Last reviewed 28 Oct 2026

Facts at a glance

Type	AI research company building open-weight models
First open-weight model	Beam 1.0, 501B total and 23B active parameters source
Beam announced	5 October 2026 source
Weights released	16 October 2026, Apache 2.0 source
Products	Beam weights, Reflection API (public beta), Mirror CLI terminal harness source

Questions people ask

What is Reflection AI's first open-weight model?: Beam, a 501B-parameter sparse mixture-of-experts model with 23B active parameters, announced on 5 October 2026 and released with Apache 2.0 weights on 16 October 2026.
Where can Beam be used?: Reflection publishes the weights on Hugging Face and offers the model through its own API platform, which it says is in public beta, as well as through cloud and hosting partners.