What a difference a year makes. At last year's San Francisco Tech Week, OpenAI was valued at a mere $157 billion, and there was unease about whether tech had truly left the doldrums of the post-COVID downturn behind. Now OpenAI has reached a lofty $500 billion valuation. AI has gone mainstream and is fueling investor frenzy in all manner of startups. The good times are back in tech, and San Francisco is the white hot center of it all. "This year, there's an energy I haven't seen in a long time,"

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