My understanding is that they're promising those as endgoals of the development trajectory, not that any current model actually is AGI. Did anyone really claim that, let's say GPT4, would cure cancer or meet any AGI standard?

Well, Sam Altman had said not long ago we would have AGI in 2025, and has been constantly implying something about "AI Scientists" and this and that. He literally said "We now know how to build AGI", also not long ago. He also stated that ChatGPT passed the Turing test without much fuss. The Anthropic has been pushing the narrative about the massive job loss, implying again that there would be an absolutely transforming impact coming soon. The Microsoft MBA-in-charge will have you believe his entire life and work is supposedly managed by an army of Clippy 2.0. The Google-MBA-in-charge has now started day-dreaming about space-based clusters, because guess what, his tool generates better fake pictures than Altman's. He too peddles the nonsense about the superpowerful AI. So, again yes, they said the AI would cure cancer and meet the AGI standard, so I demand they be held accountable for their own words and provide the answers to those questions!