United Kingdom · Models & research

Reflection AI launches Beam, a 501‑billion‑parameter open‑weight model that cuts inference cost

On October 5, 2026 Reflection AI unveiled Beam, a 501‑billion‑parameter mixture‑of‑experts language model that activates only 23 billion parameters per request and promises three‑to‑four‑fold lower compute for inference while matching the performance of leading Chinese models.