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Further confirmation about 5.1/5.0/4.1/4o etc using the original pretrain from this Time interview with Greg Brockman
At 8:20 (emphasis mine):
For a period of about two years, right from when we announced GPT-4o in April of 2024 to December of 2025, we were really squeezing the juice out of the GPT-4o model, right? that that we sort of had a bunch of pieces that uh we were improving but that fundamentally we were on the same underlying base model
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