Image Model Support Matrix

The current externally exposed image capabilities are not limited to a single gpt-image-* model. Based on the existing scripts and gateway adaptation logic, the image stack actually covers multiple model lines, including Gemini, Jimeng Image, Doubao Seedream, Grok Image, GPT Image, and OpenAI Images-compatible models. However, their requirements for entry points, reference images, sizes, and output formats are not exactly the same.

If you only want to know “which interface should I use,” prioritize the “Recommended entry” column; if you only want to know “whether this model supports image-to-image,” prioritize the “Reference image input” column.

Model Summary Table

Model family	Representative models	Recommended entry	Reference image input	Typical output
Gemini image models	`gemini-3-pro-image-preview`, `gemini-2.5-flash-image-preview`, `gemini-3.1-flash-image-preview`	`/v1beta/models/{model}:generateContent`	`inlineData` with multiple parts	`inlineData` or URL
gpt-image-2	`gpt-image-2`	`/v1/images/generations`	JSON `image`, supports multiple Base64 images	`url` or `b64_json`
Jimeng Image	`jimeng-4.0`, `jimeng-4.5`	`/v1/images/generations`, `/v1/images/edits`, `/jm`	JSON `image` array or file upload	`url` or `b64_json`
Doubao Seedream	`doubao-seedream-4-0-250828`, `doubao-seedream-4-5-251128`, `doubao-seedream-5-0-260128`	`/v1/images/generations`	JSON `image`, usually a Base64 array	`url` or `b64_json`
Grok Image	`grok-4-2-image`	`/v1/images/generations`	JSON `image`, usually a Base64 array	Mainly `url`
OpenAI Images-compatible	`gpt-image-1`, `dall-e-3`, `dall-e-2`	`/v1/images/generations`, `/v1/images/edits`	`image` / `mask`	`url` or `b64_json`

By Family

Gemini image models

Item	Description
Recommended API	`POST /v1beta/models/{model}:generateContent`
Example models	`gemini-3-pro-image-preview`, `gemini-2.5-flash-image-preview`, `gemini-3.1-flash-image-preview`
Request style	Native Gemini `contents[].parts[]`
Reference image	Pass image binary data through `inlineData`
Aspect ratio parameter	`generationConfig.imageConfig.aspectRatio`
Size parameter	`generationConfig.imageConfig.imageSize`
Size characteristics	`gemini-3-pro-image-preview` supports `1K` / `2K`; `gemini-2.5-flash-image-preview` and `gemini-3.1-flash-image-preview` fall back to `1K`
Details page	Gemini Image Generation API

gpt-image-2

Item	Description
Recommended API	`POST /v1/images/generations`
Example models	`gpt-image-2`
Request style	OpenAI Images-compatible JSON
Reference image	`image: ["<base64>", ...]`
Output format	`response_format = url` or `b64_json`
Size characteristics	Primarily built-in base aspect ratios and size tiers
Details page	gpt-image-2 Image Generation API

Jimeng Image

Item	Description
Recommended API	`POST /v1/images/generations` (OpenAI-compatible), `POST /v1/images/edits` (edit), `POST /jm` (official format)
Example models	`jimeng-4.0`, `jimeng-4.5`
Request style	OpenAI Images-compatible JSON / multipart/form-data / official-format JSON
Reference image	Generation: `image: ["<url>", ...]`; Edit: `image` file upload; Official format: `image_urls` array
Aspect ratio to size mapping	The `size` field sets the resolution, such as `1024*1024`; or use `ratio` to set the aspect ratio
Resolution	`resolution` field: `1k`, `2k`, `4k`
Output format	`url` or `b64_json`
Official format	Requires the query parameters `Action=CVSync2AsyncSubmitTask` and `Version=2022-08-31`
Details page	Jimeng Image Overview

Doubao Seedream

Item	Description
Recommended API	`POST /v1/images/generations`
Example models	`doubao-seedream-4-0-250828`, `doubao-seedream-4-5-251128`, `doubao-seedream-5-0-260128`
Request style	OpenAI Images-compatible JSON
Reference image	`image: ["<base64>", ...]`
Aspect ratio to size mapping	`16:9 -> 2560x1440`, `9:16 -> 1440x2560`, `1:1 -> 2048x2048`, etc.
Output format	Prefer `b64_json`, but `url` may also be returned alone
Details page	Doubao Seedream Image Generation API

Grok Image

Item	Description
Recommended API	`POST /v1/images/generations`
Example models	`grok-4-2-image`
Request style	OpenAI Images-compatible JSON
Reference image	`image: ["<base64>", ...]`
Aspect ratio to size mapping	`16:9 -> 2560x1440`, `9:16 -> 1440x2560`, `1:1 -> 2048x2048`, etc.
Output format	Mainly returns `url`; do not rely on `b64_json`

OpenAI Images-compatible

Item	Description
Recommended API	`POST /v1/images/generations`, `POST /v1/images/edits`
Example models	`gpt-image-1`, `dall-e-3`, `dall-e-2`
Request style	Native OpenAI Images fields
Reference image	`image`, `mask`
Output format	`url` or `b64_json`
Notes	The common semantics of this model set are described in OpenAI Images Compatibility Overview, making it suitable for compatibility integration

Aspect Ratios and Sizes

Common aspect ratios

Aspect ratio	Common families
`1:1`	Gemini, gpt-image-2, Jimeng, Seedream, Grok
`16:9`	Gemini, gpt-image-2, Jimeng, Seedream, Grok
`9:16`	Gemini, gpt-image-2, Jimeng, Seedream, Grok
`4:3` / `3:4`	gpt-image-2, Jimeng, Seedream, Grok
`3:2` / `2:3`	gpt-image-2, Jimeng, Seedream, Grok
`21:9`	Jimeng, Seedream, Grok

gpt-image-2 base aspect ratios and size tiers

The base tiers for gpt-image-2 are as follows:

Preset	Actual target size	Notes
`1:1`	`1024x1024`	Base tier
`4:3`	`1536x1152`	Base tier
`3:2`	`1536x1024`	Base tier
`2:3`	`1024x1536`	Base tier
`16:9`	`1920x1080`	Base tier
`9:16`	`1080x1920`	Base tier

However, note that this does not mean all upstream providers natively accept these sizes. The scripts will automatically fall back to a closer official size when necessary and write the target aspect ratio into the prompt.

Overview

Text Models

Image Models

Video Models

Uploads

Tasks

Account

Image Model Support Matrix

Image Model Support Matrix

Model Summary Table

By Family

Gemini image models

gpt-image-2

Jimeng Image

Doubao Seedream

Grok Image

OpenAI Images-compatible

Aspect Ratios and Sizes

Common aspect ratios

gpt-image-2 base aspect ratios and size tiers

Recommended Reading

​Image Model Support Matrix

​Model Summary Table

​By Family

​Gemini image models

​gpt-image-2

​Jimeng Image

​Doubao Seedream

​Grok Image

​OpenAI Images-compatible

​Aspect Ratios and Sizes

​Common aspect ratios

​gpt-image-2 base aspect ratios and size tiers

​Recommended Reading

Image Model Support Matrix

Model Summary Table

By Family

Gemini image models

gpt-image-2

Jimeng Image

Doubao Seedream

Grok Image

OpenAI Images-compatible

Aspect Ratios and Sizes

Common aspect ratios

gpt-image-2 base aspect ratios and size tiers

Recommended Reading