Model maintenance: google-videos #596

Items the Google × Videos model-maintenance routine has already posted to Discord, one per line: <key> | <first posted> | <fact>.

new-model:veo-3.1-generate-001,veo-3.1-fast-generate-001 | 2026-11-10 | Cloud GA Veo 3.1 ids (retire May 4, 2027 or later) fit the Vertex Veo route, which has no cataloged id since #585; register after a live Vertex call or delete the route
new-operation:extend | 2026-11-10 | Video extension (extend task, 3–10 s per turn up to 30 s) on gemini-omni-1.2-flash has no Celeste operation; video input always sends task edit
new-field:delivery | 2026-11-10 | response_format.delivery uri (Files URI, poll until ACTIVE, for videos over 4 MB) has no Celeste parameter
new-input:reference_video | 2026-11-10 | Reference videos (up to 3 clips of 3 s; 1 for 11–15 s output) on gemini-omni-1.2-flash have no Celeste parameter