The name is the button.

An agent writes the code now, and a human thumb hovers over Accept all a hundred times a day. The honest question of this decade is what, exactly, you just accepted. So I read the diff.

Eight years as a backend engineer in Stockholm, back in Tokyo since 2023, and I still ship something small most nights, usually badly. My one rule: the only real review of a model is the thing you built with it. That is why there is no leaderboard on this site.

Around a hundred and forty sources come through — the labs' own posts, the papers, the tools, the runtimes and languages nobody is watching yet, the chip under the demo, and the newsletters people actually forward. What is moving gets counted so the week reads at a glance, and every few days I explain one mechanism in plain words.

A story here is a headline, a short excerpt, one image and the link to whoever wrote it. We never reproduce the post; the images belong to their authors. A post written in Japanese appears in Japanese, exactly as it was published, and the link goes to the original.

— Yuki Halvorsen, Tokyo

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StepFun Launches Step 5 Preview: 600B Sparse MoE, 1M Context, Weights Open Oct 15

September 20

StepFun has launched Step 5 Preview, a sparse Mixture-of-Experts base model with about 600 billion total parameters and roughly 27 billion activated per token.

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StepFun Launches Step 5 Preview: 600B Sparse MoE, 1M Context, Weights Open Oct 15

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