>If there is any truth to this timeline, then presumably it just means an additional 2 weeks of RL training on Astra

OpenAI finished a larger pre-train (rumors are it's the largest since GPT 4.5) in late August (not Astra). Presumably, this is post training on top of that since it lines up.

>They are not shy - if there was a more impressive claim they could make, they would have made it.

What claim would that be ?