The creator runs you through three rapid-fire math problems — 9+2, 5+3, 10-6 — then asks you to think of a number between 5 and 12. If you said 7, you're in the majority and you weren't random at all.

For the past two days, I’ve been testing an early access version of Claude Opus 4, the latest model by Anthropic that was just announced today. You can read more about the model in the official blog ...

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