Reflection AI unveils Beam: 501B-param open agentic model with 23B active, weights this month
belizgunel · x · 2026-10-06
Reflection AI introduced Beam, its first model: a highly efficient agentic open model with 501B total and 23B active parameters.
- Frontier reasoning efficiency
- Advances the Western open frontier on coding & agentic tasks
- Trained end-to-end from scratch
- Full weights release this month
The team lead recalls the high-compute RL team was only formed in February; scalable infrastructure and a mid-training foundation kept RL stable as the run scaled up — a direct challenge to the open-weight frontier.
Related event: Reflection AI Debuts Beam, a 501B-Parameter Open-Weight Model(20 posts)→
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