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This is measurably true. They claim they don't know why because "they haven't changed anything" but it is true at the very least

I think at least some of this is expectation setting. I'd been saving my prompts from the beginning. In some cases I saved the results.

On the API: My prompts are getting 'harder' and expecting more. My old prompts still work just fine still.

On the website: Copy pasting the same old prompts still work... but the 'flavor' of the text that pops out definitely feels worse.

I haven't seen any actual data showing a degredation.