Gemini 3.1 Flash Image Preview API

Overview

About this model

Gemini 3.1 Flash Image generation model that balances creative efficiency and visual expression, suitable for creative ideation, content illustrations, and everyday design. Supports 1K / 2K / 4K. Billing notes: different resolutions correspond to different price tiers. The base price for the per-image generation mode is 1K: $0.017/image, 2K: $0.021/image, 4K: $0.028/image, and multiple images are accumulated by quantity. The above are base prices in USD; the actual cost will also apply the selected channel and user group multipliers.

Capabilities

Capability matrix

Pricing and groups

Routes and pricing

Per-request models are marked “/ request”. Other prices are in USD per 1M tokens. Rates follow provider adjustments; live prices in Model Explorer as the reference.

Snapshot: 2026-10-07 23:09. Availability reflects active probes over the past 24 hours; performance reflects actual calls.

API

Integration example

All models share one OpenAI-compatible endpoint. To switch models, change the model field. One key accesses every model.

curl https://api.yomiapi.com/v1/chat/completions \
  -H "Authorization: Bearer sk-your-yomi-key" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gemini-3.1-flash-image-preview",
    "messages": [{"role": "user", "content": "Hello"}]
  }'