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I was under the impression labs released post-training checkpoints fairly often?

So Model N/N+1 might literally have had the exact the same pretraining run and only differ on how much/what kind of postraining they got

How about expanding a little instead of just saying "that's not how training pipelines work".

pretty sure at this point no one is retraining from zero they have their big model and they fine tune it.

different training makes a different version (agent, info sec etc).

The GPT-5.5 and 5.6 Spud pretrain is a fresh pretrain run.

OpenAI has the Doug/Astro pretrain coming up next.