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Yes, an A100 costs $4.13/hour

So who is paying for the freely available models?

For example there is StableDiffusion XL here:

The owner of the space.

Sometimes huggingface pays for them if they’re popular as a sort of ad for HF spaces

Makes me wonder how much money OpenAI is burning ...

SDXL is only a 6.6B parameter model, its not a big model compared to LLMs.

Yeah, they probably don't want their 'demo' links on the HN home page.

Yes they do want those links on HN home page. Clout/likes/stars are worth more than GPU credits to most.