Clearly no one is using Meta’s customer facing AI products. Why aren’t they using their own gpu/compute for development?

Because Muse isn't good enough and why use Muse if they'll let you use Opus for free?

that is a fair point. The contrast between Meta and Apple could not be bigger here. Apple has billions of devices and yet they decided to use 3rd party models from OpenAI and later Google to build their AI features rather than building foundational models in house. Yet Meta did opposite: they built models (spending billions of $$$ and firing 10% of the company) for billions of users who rather would not use Meta AI features.

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