OpenAI — Headquarters: San Francisco

NoteThe source directly confirms that OpenAI's headquarters is in San Francisco. The Wikidata entry explicitly states 'headquarters location: San Francisco' and provides specific coordinates and the Pioneer Building as the location. The source also notes in an image caption that the Pioneer Building in San Francisco was OpenAI's headquarters (though with a note about it being a former headquarters as of 2019, suggesting possible relocation). The claim is confirmed by the current headquarters location field in the source.