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Was released after.

I'm confused. From what I can tell GPT-2 was released in 2019...

It was not the last version they released open source. GPT-OSS-120B was released open source after it.

Oh duh, you are absolutely right. I thought you were saying they never released GPT-2.

For clarity here, "after" was 6 years later, once Meta and then the Chinese labs had already established the ecosystem