Microsoft is not a frontier AI shop at all. They just resell others' models. They don't have anything of their own worth mentioning. They missed the boat and tried to acquire OpenAI and failed, and now they pivoted their strategy to be a model-agnostic middleman.

And meta is only arguably so. Not really in the same league as OpenAI and Anthropic. More second tier like Google and xAi. (and of those Google is pretty close to the top two at times)