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Questions & unknowns Research & technical analysis
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Multiple readings Introducing Beam: Reflection’s 501B open-weight model — Reflection Research & technical analysis · 2 attributable reactions
Showing signals surfaced by Marc Lanctot ×
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Established Models & releases Release 15d ago
Reflection Beam 501B model launch

Introducing Beam: Reflection’s 501B open-weight model — Reflection

4 experts across 4 network communities independently surfaced this.

4 experts 4 communities 1 sources clustered
Marc Lanctot Ramon Astudillo Tim Kellogg Sung Kim
How the network is reacting Experts are approaching this through 2 distinct lenses.
Multiple readings

Research & technical analysis

1 expert

Evidence, methods and technical implications.

“Reflection AI's Beam: a highly efficient agentic open model with 501B total parameters and 23B active. - Frontier reasoning efficiency - Advances the Western open frontier on coding & agentic tasks - Trained end-to-end from scratch Full weights release this…”

Questions & unknowns

1 expert

What remains unresolved or contested.

“Its interesting that Mistral went for 1T while Reflection went for 0.5T. RL is becoming king. I wonder how the pre-training vs RL post-training napkin math looks like reflection.ai/blog/introdu...”

2 experts discussed this · 2 posts
Sung Kim: Reflection AI's Beam: a highly efficient agentic open model with 501B total parameters and 23B active. - Frontier reasoning efficiency - Advances the Western open frontier on coding & agentic tasks…
Al Merose: I can’t wait to see how Marin’s model stacks up when it’s fully cooked. It has a similar parameter makeup, and the entire dev process is fully open source. bsky.app/profile/open...
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Primary source reflection.ai ↗
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3 experts · 5 posts · 16d ago
Marc Lanctot Christian Wolf David Picard
Reaction converging Research & technical analysis · 3
David Picard: 6 papers to review for ICLR. Fair game. It's a lot, but I understand I have to contribute, sure. But 16 days to do it is just bad. I won't be able to deliver the best review I can do in such a shor…
Christian Wolf: I have only 3 but now I receive invites from ACs to receive additional papers.... ?!?
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3 experts · 3 posts · 5d ago
Marc Lanctot Andres Guadamuz Max Woolf
Max Woolf: I regret having praised 404 in the past this is an embarrassing attempt to join in on a dogpile, and they should be ashamed that they're publicly acting like this for an organisation with a humanis…
Marc Lanctot: Ok so it's not just me..I was sure I had more positive memories of this outlet as well. When I read the Character AI bankrupty piece from yesterday, it def gave major sleazy tabloid vibes... "Enshi…
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