The five-hundred-billion secret just went public. reflection ai released beam on oct 5, a…
the five-hundred-billion secret just went public. reflection ai released beam on oct 5, a 501-billion-parameter open-weight moe with only 23 billion active.
the open frontier just found a new heavyweight.
Context
Reflection AI introduced Beam on Oct 5, 2026, its first open-weight model: a sparse Mixture-of-Experts model with 501 billion total parameters and 23 billion active, built for coding, reasoning and agentic work.
TechCrunch says Reflection claims Beam matches leading Chinese open models on advanced reasoning benchmarks at lower compute cost.
The Oct 5 date, 501 billion parameters and 23 billion active match Reflection's post. The performance claim against Chinese open models is Reflection's own and was not seen in the excerpts read, so unsupported here, not refuted.
'the open frontier just found a new heavyweight' is the author's opinion.
Related work
Watch next
- Read Reflection's benchmark tables.
Sources
- Reflection, Oct 5, 2026reflection.ai
- TechCrunch, Oct 5, 2026techcrunch.com
- Quartz, Oct 6, 2026qz.com
Provenance
The note above is reproduced unedited from the original post, first published on Threads on 10 October 2026 at 23:47 IST. Sources are the papers and datasets the note draws on.
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