> ## Documentation Index
> Fetch the complete documentation index at: https://docs.apiyi.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Gemini image preview models switched to Vertex high-cost channel today · larger 4K output

> Today both gemini-3-pro-image-preview and gemini-3.1-flash-image-preview have been switched to the Vertex high-cost channel to secure supply, availability back to stable. Side change: Nano Banana Pro 4K output on Vertex is about 20MB per image versus ~10MB on AiStudio; size your download, storage and CDN bandwidth against the 20MB ceiling.

**2026/5/28 12:27 (UTC+8)** · Model Status · Google

📡 **`gemini-3-pro-image-preview` / `gemini-3.1-flash-image-preview` switched to Vertex high-cost channel today to secure supply · Nano Banana Pro 4K output is larger** — Heads-up: today both Gemini image preview models have been switched to Google's **Vertex high-cost channel** to guarantee supply, with overall availability back to stable. One side change: **Nano Banana Pro (`gemini-3-pro-image-preview`) produces larger 4K images on Vertex — about 20MB per image**, versus about **10MB on the AiStudio channel** — size your download, storage and CDN bandwidth against the 20MB ceiling.

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