Reflection LLM Big Open weights

Beam

40 days since Reflection announced it · 5 Oct 2026

Beam is an open-weights LLM from Reflection, announced 5 Oct 2026. Its context window is 1M tokens. It has 501B parameters.

Input: —; per 1M tokens
Cache write: —; per 1M tokens
Cache read: —; per 1M tokens
Output: —; per 1M tokens
Context window: 1M; tokens
Parameters: 501B; total

No price on the lab’s own pages.

Announcement: reflection.ai/blog/introducing-beam
Docs: reflection.ai/beam-model-card
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Reflection releases Beam, its first open-weights model
17 Oct 2026

Reflection · Big · Beam

open weights

Beam 5 Oct 2026

Facts last updated 14 Nov 2026, from Reflection’s own pages.