All of the labs would rather not have to give access to the top-of-the-line models via general API.
We were locked into this equilibrium thanks to the accident that ChatGPT came out after OpenAI had already released a completion API.
The amount of value that can be extracted from LLMs is extremely variable in different verticals.
A general-purpose API has to be priced at the median amount of value across verticals.
But the amount of value that could be extracted for, say, cancer drug discovery, is way more.
The labs would rather be able to do price discrimination by having vertical-specific APIs.
Mythos is a first step in this direction.
It can't be generally released for safety reasons… which also conveniently means that it can only be released to specific customers under specific negotiated terms.
They'd be silly to not have use-case-specific pricing in that world.