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Is it a coincidence that 4.7 was seemingly quantized over past 7 days?

There's the other (orthogonal) possible explanation of using more GPUs for stress-testing before product launch.

That's less an orthogonal explanation and more an example of why they'd do something like serve a quantized model.

Nope, they deliberately enshittify the old model right before release to fake the metrics.

Good ol' sawtooth step change.