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Twitter comes for Substack

There's reason to celebrate — and to worry

Casey Newton

Casey Newton

Jan 26, 2021 — 9 min read
Twitter comes for Substack

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OpenAI's big launch — and bigger departure

GPT-5.6 impresses the critics, but Fidji Simo's exit leaves OpenAI's focus — and its org chart — in flux. PLUS: Meta plays catch-up, and the "AI 2027" authors present "AI 2040."

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News at the intersection of Silicon Valley and democracy. On Monday, Tuesday, and Thursday at 5PM Pacific.