---
title: "Generate images with Gemini 3.1 Flash from a text prompt"
method: POST
path: "/v2/images/generate/gemini-3.1-flash"
tags: ["images-generate"]
---

# Generate images with Gemini 3.1 Flash from a text prompt

`POST /v2/images/generate/gemini-3.1-flash`

Generate one or more images with Gemini 3.1 Flash. The prompt is
consumed by the model directly, without rewriting.

The output is served at the closest aspect ratio the model supports,
at 1K resolution.

By default the request blocks until the images are ready and returns
them in `data`. Set `async` to true to return immediately after the
request is accepted, then poll for completion and results with
`GET /v1/generations/{generation_id}` using the returned
`generation_id`.

Supplying a `webhook_url` makes the request asynchronous whatever
`async` says: the response returns as soon as the request is accepted,
and the finished result is POSTed to that URL.

## Request body

- GenerateImageGemini31FlashRequest
  - `prompt` string, required — The prompt to generate images from. The model consumes it directly, without rewriting.
  - `aspect_ratio` string — The requested output aspect ratio, for example "1:1", "16:9", or "9:16". The output is served at the closest aspect ratio the model supports, at 1K resolution. Defaults to "1:1".
  - `num_images` integer — The number of images to generate.
  - `seed` integer — Random seed. Set for reproducible generation.
  - `async` boolean — When false (the default), the request blocks until the images are ready and returns them in `data`. When true, the request returns as soon as it is accepted; poll for completion and results with `GET /v1/generations/{generation_id}` using the returned `generation_id`.
  - `webhook_url` string, uri — HTTPS URL that Ideogram delivers the generated result to. Ideogram sends a JSON POST to this URL once all images for the request have finished generating. The body mirrors the synchronous generate response: `request_id`, `created`, and a `data` array containing every generated image (`url`, `prompt`, `resolution`, `seed`, `is_image_safe`). Each delivery is signed with Ed25519 and verifiable against the public keys at `https://api.ideogram.ai/v1/.well-known/jwks.json`. Must be HTTPS; private and loopback hosts and the cloud metadata service are rejected.
  - `private` boolean, nullable — When true or omitted, the output is kept private to your account. Set to false to publish the output to the public feed. Enterprise accounts always generate privately.
  - `target_collection_id` string — A collection you can write to, by its URL-safe base64 collection id. The output images are added to it when the request completes.

## Response `200`

The generated images (synchronous requests), or an acknowledgement to poll with `GET /v1/generations/{generation_id}` (`async` requests).

- GenerateImageGemini31FlashResponse — Response returned by `POST /v2/images/generate/gemini-3.1-flash`. Synchronous requests (the default) include the generated images in `data`. Requests with `async` set to true omit `data`; poll for completion and results with `GET /v1/generations/{generation_id}` using the returned `generation_id`. The seed reports the value the request resolved to when the caller left it unset.
  - `generation_id` string, required — URL-safe base64 ID of the accepted generation. Accepted by the `GET /v1/generations/{generation_id}` polling endpoint.
  - `data` GeneratedImageObject[] — The generated images, in generation order. Present only for synchronous requests (`async` omitted or false).
    - `url` string, uri, nullable — The direct link to the generated image. Empty when the image did not pass safety checks.
    - `prompt` string, required — The final prompt the image was generated from.
    - `resolution` string, required — The resolution of the generated image, formatted as "WIDTHxHEIGHT".
    - `is_image_safe` boolean, required — Whether the image passed safety checks. If false, `url` is empty.
    - `seed` integer, required — Random seed. Set for reproducible generation.
  - `seed` integer, required — Random seed. Set for reproducible generation.

## Other responses

- `400` — Invalid input provided.
- `401` — Unauthorized.
- `402` — Insufficient credits or quota.
- `422` — The prompt did not pass safety checks.
- `429` — Too many requests.
- `500` — Internal server error.
- `503` — The endpoint is temporarily unavailable.

## Changes

- **2026-09-05** `c0e3105ea651` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/ideogram/apis/ideogram-openapi-3-0/changes/v2/images/generate/gemini-3.1-flash/post.md)

---

[API](https://skmtc.dev/ideogram/apis/ideogram-openapi-3-0.md) · [All operations](https://skmtc.dev/ideogram/apis/ideogram-openapi-3-0/llms.txt) · [OpenAPI document](https://skmtc.dev/ideogram/apis/ideogram-openapi-3-0/revisions/9cbcc0689c00?raw)