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Google usually talks about it's hardware few months after they have moved to a newer better version. They probably are already using TPUv4 by now.

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TPUv1 was never exposed externally as a thing you could rent in cloud, but with that exception, Google's been pretty consistently trying to offer the best available option to cloud customers.

(disclaimer: while I'm part-time at Google, this is my personal impression, not an official statement, etc., etc.)

They probably feel TPUv3 is stable enough to give access to cloud customers now. But I doubt they do not already have TPUv4 versions running already internally in some capacity maybe only for testing.

Since you mention it: Cloud TPUv3 is now available in beta (brand new!) See: https://cloud.google.com/tpu/

(420 TFlop/s, 128GB HBM)

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