> ## Documentation Index > Fetch the complete documentation index at: https://docs.aihubmix.com/llms.txt > Use this file to discover all available pages before exploring further. # Generate Images > Creates an image given a prompt. [Learn more](https://developers.openai.com/api/docs/guides/images). ## OpenAPI ````yaml /openapi.json post /v1/images/generations openapi: 3.1.0 info: title: AIHubMix Gateway API description: | Unified multi-protocol gateway. Exposes three native shapes side-by-side: - OpenAI (`/v1/chat/completions`, `/v1/responses`, ...) - Anthropic (`/v1/messages`) - Gemini (`/v1beta/models/{model}:generateContent`) Each vendor's native SDK connects directly. Gateway-only fields are marked with `x-source.authority: gateway`. contact: name: AIHubMix Team version: 2.1.1 x-upstream: vendorSpecs: packageVersion: 0.1.1 installedFrom: npm sources: openai/official: version: '2026-05-31' hash: >- sha256:a203971a0bc0cd3b903b9488e3ac40eaa161a274dfaf172c1da73eee029147a8 anthropic/official: version: '2026-05-31' hash: >- sha256:f9d488f9290d78a081bed62fa0c040476b5d009f3db92c06c8e279e69df73fc9 layers: - role: L0-base source: avs://openai/official protocol: openai authority: official - role: L0-base source: avs://anthropic/official protocol: anthropic authority: official - role: gateway-other source: gateway/anthropic-mappings.yml protocol: all authority: gateway - role: horizontal-auth source: gateway/auth.yml protocol: all authority: gateway - role: horizontal-errors source: gateway/errors.yml protocol: all authority: gateway - role: L3-gateway source: gateway/openai-gateway.yml protocol: openai authority: gateway - role: gateway-other source: gateway/openai-image-mappings.yml protocol: all authority: gateway - role: gateway-other source: gateway/openai-mappings.yml protocol: all authority: gateway - role: L2-passthrough source: gateway/openai-passthrough.yml protocol: openai authority: gateway servers: - url: https://aihubmix.com description: Production - url: https://api.inferera.com description: Backup (use when the primary domain is unreachable) security: - gatewayBearer: [] tags: - name: OpenAI Compatible description: >- OpenAI-compatible endpoints (chat, completions, embeddings, images, audio, videos, moderations). - name: Anthropic Compatible description: Anthropic-native endpoints (messages with Anthropic protocol). - name: Google Vertex AI Compatible description: Google Gemini / Vertex AI endpoints. paths: /v1/images/generations: post: tags: - OpenAI Compatible summary: Generate Images description: >- Creates an image given a prompt. [Learn more](https://developers.openai.com/api/docs/guides/images). operationId: createImage requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/CreateImageRequest' responses: '200': description: OK content: application/json: schema: $ref: '#/components/schemas/ImagesResponse' text/event-stream: schema: $ref: '#/components/schemas/ImageGenStreamEvent' '400': description: Invalid request content: application/json: schema: $ref: '#/components/schemas/GatewayError' '401': description: Authentication failed content: application/json: schema: $ref: '#/components/schemas/GatewayError' '403': description: Permission denied content: application/json: schema: $ref: '#/components/schemas/GatewayError' '404': description: Not found content: application/json: schema: $ref: '#/components/schemas/GatewayError' '429': description: Rate limited content: application/json: schema: $ref: '#/components/schemas/GatewayError' 5XX: description: Server / upstream error content: application/json: schema: $ref: '#/components/schemas/GatewayError' components: schemas: CreateImageRequest: type: object properties: prompt: description: >- A text description of the desired image(s). The maximum length is 32000 characters for the GPT image models, 1000 characters for `dall-e-2` and 4000 characters for `dall-e-3`. type: string example: A cute baby sea otter x-providers-default: drop x-providers: openai: {} azure: {} model: anyOf: - type: string - type: string enum: - gpt-image-1.5 - dall-e-2 - dall-e-3 - gpt-image-1 - gpt-image-1-mini default: dall-e-2 example: gpt-image-1.5 nullable: true description: >- The model to use for image generation. One of `dall-e-2`, `dall-e-3`, or a GPT image model (`gpt-image-1`, `gpt-image-1-mini`, `gpt-image-1.5`). Defaults to `dall-e-2` unless a parameter specific to the GPT image models is used. x-providers-default: drop x-providers: openai: {} azure: {} 'n': type: integer minimum: 1 maximum: 10 default: 1 example: 1 nullable: true description: >- The number of images to generate. Must be between 1 and 10. For `dall-e-3`, only `n=1` is supported. x-providers-default: drop x-providers: openai: {} azure: {} quality: type: string enum: - standard - hd - low - medium - high - auto default: auto example: medium nullable: true description: > The quality of the image that will be generated. - `auto` (default value) will automatically select the best quality for the given model. - `high`, `medium` and `low` are supported for the GPT image models. - `hd` and `standard` are supported for `dall-e-3`. - `standard` is the only option for `dall-e-2`. x-providers-default: drop x-providers: openai: {} azure: {} response_format: type: string enum: - url - b64_json default: url example: url nullable: true description: >- The format in which generated images with `dall-e-2` and `dall-e-3` are returned. Must be one of `url` or `b64_json`. URLs are only valid for 60 minutes after the image has been generated. This parameter isn't supported for the GPT image models, which always return base64-encoded images. x-providers-default: drop x-providers: openai: {} azure: {} output_format: type: string enum: - png - jpeg - webp default: png example: png nullable: true description: >- The format in which the generated images are returned. This parameter is only supported for the GPT image models. Must be one of `png`, `jpeg`, or `webp`. x-providers-default: drop x-providers: openai: {} azure: {} output_compression: type: integer default: 100 example: 100 nullable: true description: >- The compression level (0-100%) for the generated images. This parameter is only supported for the GPT image models with the `webp` or `jpeg` output formats, and defaults to 100. x-providers-default: drop x-providers: openai: {} azure: {} stream: type: boolean default: false example: false nullable: true description: > Generate the image in streaming mode. Defaults to `false`. See the [Image generation guide](https://developers.openai.com/api/docs/guides/image-generation) for more information. This parameter is only supported for the GPT image models. x-providers-default: drop x-providers: openai: {} azure: {} partial_images: $ref: '#/components/schemas/PartialImages' x-providers-default: drop x-providers: openai: {} azure: {} size: anyOf: - type: string - type: string enum: - auto - 1024x1024 - 1536x1024 - 1024x1536 - 256x256 - 512x512 - 1792x1024 - 1024x1792 default: auto example: 1024x1024 nullable: true description: >- The size of the generated images. For `gpt-image-2` and `gpt-image-2-2026-04-21`, arbitrary resolutions are supported as `WIDTHxHEIGHT` strings, for example `1536x864`. Width and height must both be divisible by 16 and the requested aspect ratio must be between 1:3 and 3:1. Resolutions above `2560x1440` are experimental, and the maximum supported resolution is `3840x2160`. The requested size must also satisfy the model's current pixel and edge limits. The standard sizes `1024x1024`, `1536x1024`, and `1024x1536` are supported by the GPT image models; `auto` is supported for models that allow automatic sizing. For `dall-e-2`, use one of `256x256`, `512x512`, or `1024x1024`. For `dall-e-3`, use one of `1024x1024`, `1792x1024`, or `1024x1792`. x-providers-default: drop x-providers: openai: {} azure: {} moderation: type: string enum: - low - auto default: auto example: low nullable: true description: >- Control the content-moderation level for images generated by the GPT image models. Must be either `low` for less restrictive filtering or `auto` (default value). x-providers-default: drop x-providers: openai: {} azure: {} background: type: string enum: - transparent - opaque - auto default: auto example: transparent nullable: true description: > Allows to set transparency for the background of the generated image(s). This parameter is only supported for the GPT image models. Must be one of `transparent`, `opaque` or `auto` (default value). When `auto` is used, the model will automatically determine the best background for the image. If `transparent`, the output format needs to support transparency, so it should be set to either `png` (default value) or `webp`. x-providers-default: drop x-providers: openai: {} azure: {} style: type: string enum: - vivid - natural default: vivid example: vivid nullable: true description: >- The style of the generated images. This parameter is only supported for `dall-e-3`. Must be one of `vivid` or `natural`. Vivid causes the model to lean towards generating hyper-real and dramatic images. Natural causes the model to produce more natural, less hyper-real looking images. x-providers-default: drop x-providers: openai: {} azure: {} user: type: string example: user-1234 description: > A unique identifier representing your end-user, which can help OpenAI to monitor and detect abuse. [Learn more](https://developers.openai.com/api/docs/guides/safety-best-practices#end-user-ids). x-providers-default: drop x-providers: openai: {} azure: {} required: - prompt x-source: from: avs://openai/official authority: official ImagesResponse: type: object title: Image generation response description: The response from the image generation endpoint. properties: created: type: integer format: unixtime description: The Unix timestamp (in seconds) of when the image was created. data: type: array description: The list of generated images. items: $ref: '#/components/schemas/Image' background: type: string description: >- The background parameter used for the image generation. Either `transparent` or `opaque`. enum: - transparent - opaque output_format: type: string description: >- The output format of the image generation. Either `png`, `webp`, or `jpeg`. enum: - png - webp - jpeg size: type: string description: >- The size of the image generated. Either `1024x1024`, `1024x1536`, or `1536x1024`. enum: - 1024x1024 - 1024x1536 - 1536x1024 quality: type: string description: >- The quality of the image generated. Either `low`, `medium`, or `high`. enum: - low - medium - high usage: $ref: '#/components/schemas/ImageGenUsage' required: - created x-source: from: avs://openai/official authority: official ImageGenStreamEvent: anyOf: - $ref: '#/components/schemas/ImageGenPartialImageEvent' - $ref: '#/components/schemas/ImageGenCompletedEvent' discriminator: propertyName: type x-source: from: avs://openai/official authority: official GatewayError: type: object description: | OpenAI-compatible error envelope. Top-level `error` object carrying `message` / `type` / `param` / `code`. `request_id` lives in the `X-Request-Id` response header, not in the body. The legacy `upstream` field is no longer emitted. x-source: from: gateway authority: gateway required: - error properties: error: type: object required: - message properties: message: type: string description: Human-readable error message. type: type: string nullable: true description: > Error category. OpenAI-compatible values include invalid_request_error / authentication_error / permission_error / not_found_error / rate_limit_error, etc. The upstream value is passed through verbatim; the enum is not fixed. param: type: string nullable: true description: Name of the offending field, when applicable. code: nullable: true description: | Sub-error code. May be a string or integer (the gateway treats `code` as an arbitrary type). PartialImages: anyOf: - type: integer maximum: 3 minimum: 0 default: 0 example: 1 description: > The number of partial images to generate. This parameter is used for streaming responses that return partial images. Value must be between 0 and 3. When set to 0, the response will be a single image sent in one streaming event. Note that the final image may be sent before the full number of partial images are generated if the full image is generated more quickly. - type: 'null' x-source: from: avs://openai/official authority: official Image: type: object description: >- Represents the content or the URL of an image generated by the OpenAI API. properties: b64_json: type: string description: >- The base64-encoded JSON of the generated image. Returned by default for the GPT image models, and only present if `response_format` is set to `b64_json` for `dall-e-2` and `dall-e-3`. url: type: string format: uri description: >- When using `dall-e-2` or `dall-e-3`, the URL of the generated image if `response_format` is set to `url` (default value). Unsupported for the GPT image models. revised_prompt: type: string description: >- For `dall-e-3` only, the revised prompt that was used to generate the image. x-source: from: avs://openai/official authority: official ImageGenUsage: properties: input_tokens: type: integer description: The number of tokens (images and text) in the input prompt. total_tokens: type: integer description: >- The total number of tokens (images and text) used for the image generation. output_tokens: type: integer description: The number of output tokens generated by the model. output_tokens_details: $ref: '#/components/schemas/ImageGenOutputTokensDetails' input_tokens_details: $ref: '#/components/schemas/ImageGenInputUsageDetails' type: object required: - input_tokens - total_tokens - output_tokens - input_tokens_details title: Image generation usage description: >- For `gpt-image-1` only, the token usage information for the image generation. x-source: from: avs://openai/official authority: official ImageGenPartialImageEvent: type: object description: > Emitted when a partial image is available during image generation streaming. properties: type: type: string description: | The type of the event. Always `image_generation.partial_image`. enum: - image_generation.partial_image b64_json: type: string description: > Base64-encoded partial image data, suitable for rendering as an image. created_at: type: integer format: unixtime description: | The Unix timestamp when the event was created. size: type: string description: | The size of the requested image. enum: - 1024x1024 - 1024x1536 - 1536x1024 - auto quality: type: string description: | The quality setting for the requested image. enum: - low - medium - high - auto background: type: string description: | The background setting for the requested image. enum: - transparent - opaque - auto output_format: type: string description: | The output format for the requested image. enum: - png - webp - jpeg partial_image_index: type: integer description: | 0-based index for the partial image (streaming). required: - type - b64_json - created_at - size - quality - background - output_format - partial_image_index x-source: from: avs://openai/official authority: official ImageGenCompletedEvent: type: object description: > Emitted when image generation has completed and the final image is available. properties: type: type: string description: | The type of the event. Always `image_generation.completed`. enum: - image_generation.completed b64_json: type: string description: | Base64-encoded image data, suitable for rendering as an image. created_at: type: integer format: unixtime description: | The Unix timestamp when the event was created. size: type: string description: | The size of the generated image. enum: - 1024x1024 - 1024x1536 - 1536x1024 - auto quality: type: string description: | The quality setting for the generated image. enum: - low - medium - high - auto background: type: string description: | The background setting for the generated image. enum: - transparent - opaque - auto output_format: type: string description: | The output format for the generated image. enum: - png - webp - jpeg usage: $ref: '#/components/schemas/ImagesUsage' required: - type - b64_json - created_at - size - quality - background - output_format - usage x-source: from: avs://openai/official authority: official ImageGenOutputTokensDetails: properties: image_tokens: type: integer description: The number of image output tokens generated by the model. text_tokens: type: integer description: The number of text output tokens generated by the model. type: object required: - image_tokens - text_tokens title: Image generation output token details description: The output token details for the image generation. x-source: from: avs://openai/official authority: official ImageGenInputUsageDetails: properties: text_tokens: type: integer description: The number of text tokens in the input prompt. image_tokens: type: integer description: The number of image tokens in the input prompt. type: object required: - text_tokens - image_tokens title: Input usage details description: The input tokens detailed information for the image generation. x-source: from: avs://openai/official authority: official ImagesUsage: type: object description: > For the GPT image models only, the token usage information for the image generation. required: - total_tokens - input_tokens - output_tokens - input_tokens_details properties: total_tokens: type: integer description: > The total number of tokens (images and text) used for the image generation. input_tokens: type: integer description: The number of tokens (images and text) in the input prompt. output_tokens: type: integer description: The number of image tokens in the output image. input_tokens_details: type: object description: The input tokens detailed information for the image generation. required: - text_tokens - image_tokens properties: text_tokens: type: integer description: The number of text tokens in the input prompt. image_tokens: type: integer description: The number of image tokens in the input prompt. x-source: from: avs://openai/official authority: official securitySchemes: gatewayBearer: type: http scheme: bearer bearerFormat: API Key description: | Gateway-issued API key, formatted as `sk-gateway-xxxxxxxx`. Used by OpenAI-shaped endpoints (/v1/chat/completions, etc.). x-source: from: gateway authority: gateway ````