Substack's failed fundraise
How an aborted Series C could make the company stronger
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Four big reasons to worry about DeepSeek (and four reasons to calm down)
The Chinese AI upstart has rattled Silicon Valley — but how much the game has changed remains to be seen
OpenAI launches its agent
Hands on with Operator — a promising but frustrating new frontier for artificial intelligence
TikTok comes back from the dead
PLUS: What we actually learned about Mark Zuckerberg last week
Mark blames Sheryl
PLUS: What executives are telling employees about Meta's move to the right