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Not the parent, but the only other source of that claim I found was Dylan Patel's recent post from semianalysis.

Was that for 5.1 or 5.2? I recall that info spreading after 5.1’s release, I guess I naively assumed 5.2 was a delayed base model update.

You can just ask ChatGPT what its training cut-off is, and it'll say June 2024.

Ask! 5.2 says August 2025.

Oh! I stand corrected.