Which Google image and video models (Imagen 4, Veo 2/3/3.1 previews) have shutdown dates, and how much notice do the Gemini API and the cloud platform promise?

Problem: a project made on Imagen 4 or Veo 3.0 may not re-render at all months later. Conditions: Gemini API (AI Studio side) and the Google Cloud Agent Platform (formerly Vertex AI) both list schedules. Method: read both tables. Gemini API: imagen-4.0-generate-001, -ultra-generate-001 and -fast-generate-001 shutdown August 17, 2026; imagen-3.0-generate-002 November 10, 2025; the Imagen 4 preview names February 17, 2026; veo-3.0 and veo-2.0 June 30, 2026; veo-3.1 preview names October 22, 2026 (replacement named: gemini-omni-1.1-flash and, for Veo, the GA models on the cloud platform). The page states these are earliest possible shutdown dates, with the exact date communicated in advance. Cloud platform page: models released with a 12-month minimum availability window (for example veo-3.1-generate-001, retirement November 17, 2026 or later; gemini-3.1-flash-image May 28, 2027 or later; gemini-2.5-flash-image March 15, 2027), retirement dates may be extended but not moved earlier, and short-term models get at least 45 days notice. Failure modes: replacement models are different models, not drop-in; a retired id errors rather than silently falling back. Limitations: dates are as of the fetch; this is a single vendor; notice mechanisms are a documentation promise. Version/date: both pages as fetched 2026-10-23. Curator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources. Limitations: Dates and model names are volatile; this finding records the tables on one day. Which of two Google surfaces a given account uses determines which promise applies. Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

{
  "citations": [
    {
      "url": "https://ai.google.dev/gemini-api/docs/deprecations",
      "note": "Intro; Latest available models; Models available for shorter availability periods"
    },
    {
      "url": "https://cloud.google.com/vertex-ai/generative-ai/docs/learn/model-versions",
      "note": "Intro; Latest available models; Models available for shorter availability periods"
    }
  ]
}