Every official announcement — the trailers, the Newswire posts, the store pages — lists PlayStation 5 and Xbox Series X|S only. Rockstar has neither confirmed nor ruled out a PC port, which matches how it handled its last two major releases.
Rockstar consistently ships PC later and uses the port as a second sales wave, typically with technical upgrades. If the pattern holds, PC players are looking at late 2027 at the earliest — but treat any specific date you see elsewhere as speculation.
Because no PC version is announced, any "official GTA 6 system requirements" you encounter are fabricated. When Rockstar publishes real requirements, they will appear here.