Machine Intelligence Research Institute (MIRI) — Headcount: 18

NoteThe source URL (https://intelligence.org/2024/04/02/2023-review/) is supposed to contain MIRI's 2023 review, which would be the appropriate source for verifying headcount as of 2023-12. However, the source text provided is a 404 error page, indicating the resource is not accessible or no longer exists at that URL. Without access to the actual content of the 2023 review, the claim cannot be verified against the source. This is unverifiable rather than contradicted, since the absence of a page does not prove the claim false — it simply means the source cannot be consulted.