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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.

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Model Summary Table

Model familyRepresentative modelsRecommended entryReference image inputTypical output
Gemini image modelsgemini-3-pro-image-preview, gemini-2.5-flash-image-preview, gemini-3.1-flash-image-preview/v1beta/models/{model}:generateContentinlineData with multiple partsinlineData or URL
gpt-image-2gpt-image-2/v1/images/generationsJSON image, supports multiple Base64 imagesurl or b64_json
gpt-image-2-progpt-image-2-pro/v1/images/generationsJSON image, supports multiple Base64 imagesurl or b64_json
Jimeng Imagejimeng-4.0, jimeng-4.5/v1/images/generations, /v1/images/edits, /jmJSON image array or file uploadurl or b64_json
Doubao Seedreamdoubao-seedream-4-0-250828, doubao-seedream-4-5-251128, doubao-seedream-5-0-260128/v1/images/generationsJSON image, usually a Base64 arrayurl or b64_json
Grok Imagegrok-4-2-image/v1/images/generationsJSON image, usually a Base64 arrayMainly url
OpenAI Images-compatiblegpt-image-1, dall-e-3, dall-e-2/v1/images/generations, /v1/images/editsimage / maskurl or b64_json

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By Family

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Gemini image models

ItemDescription
Recommended APIPOST /v1beta/models/{model}:generateContent
Example modelsgemini-3-pro-image-preview, gemini-2.5-flash-image-preview, gemini-3.1-flash-image-preview
Request styleNative Gemini contents[].parts[]
Reference imagePass image binary data through inlineData
Aspect ratio parametergenerationConfig.imageConfig.aspectRatio
Size parametergenerationConfig.imageConfig.imageSize
Size characteristicsgemini-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 pageGemini Image Generation API

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gpt-image-2

ItemDescription
Recommended APIPOST /v1/images/generations
Example modelsgpt-image-2
Request styleOpenAI Images-compatible JSON
Reference imageimage: ["<base64>", ...]
Output formatresponse_format = url or b64_json
Size characteristicsPrimarily built-in base aspect ratios and size tiers
Details pagegpt-image-2 Image Generation API

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gpt-image-2-pro

ItemDescription
Recommended APIPOST /v1/images/generations
Example modelsgpt-image-2-pro
Request styleOpenAI Images-compatible JSON
Reference imageimage: ["<base64>", ...]
Output formatresponse_format = url or b64_json
Size characteristicsAdditional 2K and 4K high-resolution tiers on top of the base tiers
Details pagegpt-image-2-pro Image Generation API

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Jimeng Image

ItemDescription
Recommended APIPOST /v1/images/generations (OpenAI-compatible), POST /v1/images/edits (edit), POST /jm (official format)
Example modelsjimeng-4.0, jimeng-4.5
Request styleOpenAI Images-compatible JSON / multipart/form-data / official-format JSON
Reference imageGeneration: image: ["<url>", ...]; Edit: image file upload; Official format: image_urls array
Aspect ratio to size mappingThe size field sets the resolution, such as 1024*1024; or use ratio to set the aspect ratio
Resolutionresolution field: 1k, 2k, 4k
Output formaturl or b64_json
Official formatRequires the query parameters Action=CVSync2AsyncSubmitTask and Version=2022-08-31
Details pageJimeng Image Overview

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Doubao Seedream

ItemDescription
Recommended APIPOST /v1/images/generations
Example modelsdoubao-seedream-4-0-250828, doubao-seedream-4-5-251128, doubao-seedream-5-0-260128
Request styleOpenAI Images-compatible JSON
Reference imageimage: ["<base64>", ...]
Aspect ratio to size mapping16:9 -> 2560x1440, 9:16 -> 1440x2560, 1:1 -> 2048x2048, etc.
Output formatPrefer b64_json, but url may also be returned alone
Details pageDoubao Seedream Image Generation API

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Grok Image

ItemDescription
Recommended APIPOST /v1/images/generations
Example modelsgrok-4-2-image
Request styleOpenAI Images-compatible JSON
Reference imageimage: ["<base64>", ...]
Aspect ratio to size mapping16:9 -> 2560x1440, 9:16 -> 1440x2560, 1:1 -> 2048x2048, etc.
Output formatMainly returns url; do not rely on b64_json

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OpenAI Images-compatible

ItemDescription
Recommended APIPOST /v1/images/generations, POST /v1/images/edits
Example modelsgpt-image-1, dall-e-3, dall-e-2
Request styleNative OpenAI Images fields
Reference imageimage, mask
Output formaturl or b64_json
NotesThe common semantics of this model set are described in OpenAI Images Compatibility Overview, making it suitable for compatibility integration

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Aspect Ratios and Sizes

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Common aspect ratios

Aspect ratioCommon families
1:1Gemini, gpt-image-2, gpt-image-2-pro, Jimeng, Seedream, Grok
16:9Gemini, gpt-image-2, gpt-image-2-pro, Jimeng, Seedream, Grok
9:16Gemini, gpt-image-2, gpt-image-2-pro, Jimeng, Seedream, Grok
4:3 / 3:4gpt-image-2, gpt-image-2-pro, Jimeng, Seedream, Grok
3:2 / 2:3gpt-image-2, gpt-image-2-pro, Jimeng, Seedream, Grok
21:9Jimeng, Seedream, Grok

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gpt-image-2 base aspect ratios and size tiers

The base tiers for gpt-image-2 are as follows:
PresetActual target sizeNotes
1:11024x1024Base tier
4:31536x1152Base tier
3:21536x1024Base tier
2:31024x1536Base tier
16:91920x1080Base tier
9:161080x1920Base tier

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gpt-image-2-pro extended high-resolution tiers

On top of the base tiers, gpt-image-2-pro also exposes the following high-resolution options:
PresetActual target sizeNotes
1:1(2K)2048x2048gpt-image-2-pro extended tier
4:3(2K)2048x1536gpt-image-2-pro extended tier
3:2(2K)2560x1712gpt-image-2-pro extended tier
2:3(2K)1712x2560gpt-image-2-pro extended tier
16:9(2K)2048x1152gpt-image-2-pro extended tier
9:16(2K)1152x2048gpt-image-2-pro extended tier
1:1(4K)2880x2880gpt-image-2-pro extended tier
4:3(4K)3840x2880gpt-image-2-pro extended tier
3:2(4K)3840x2560gpt-image-2-pro extended tier
2:3(4K)2560x3840gpt-image-2-pro extended tier
16:9(4K)3840x2160gpt-image-2-pro extended tier
9:16(4K)2160x3840gpt-image-2-pro extended 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.
  1. Image Series Overview
  2. Gemini Image Generation API
  3. gpt-image-2 Image Generation API
  4. gpt-image-2-pro Image Generation API
  5. Jimeng Image Overview
  6. Doubao Seedream Image Generation API
  7. OpenAI Images Compatibility Overview
  8. OpenAI Images-Compatible Image Editing