GENERATION API CALLS

Image Model Generation

OpenAI

This page is auto-generated from model configurations. Last updated: 2026-09-16.

This reference lists all available OpenAI image generation models and their parameters. Use these parameter names when calling the Generation API.

GPT Image
GPT Image 1.5
GPT Image 2
GPT Image 2.5 Flare
GPT Image 2.5 Sunburst

GPT Image

OpenAI’s GPT Image 1 model for image editing and generation

Model ID: model_openai-gpt-image-1-editing

Capabilities: txt2img, img2img

LLM Markdown: https://app.scenario.com/api/models/model_openai-gpt-image-1-editing/markdown

Parameter	Type	Required	Default	Min	Max	Allowed Values	Description
`referenceImages`	file_array	No	-	-	-	-	Reference images for style or content guidance
`prompt`	string	Yes	-	-	-	-	Text prompt for image editing
`numOutputs`	number	No	`1`	1	10	-	Number of images to generate
`aspectRatio`	string	No	`auto`	-	-	`auto`, `1:1`, `3:2`, `2:3`	Aspect ratio for the generated image
`inputFidelity`	string	No	`high`	-	-	`low`, `high`	Preserve details from input images
`quality`	string	No	`high`	-	-	`high`, `medium`, `low`	Generation quality
`background`	string	No	`auto`	-	-	`transparent`, `opaque`, `auto`	Background transparency

GPT Image 1.5

OpenAI’s GPT Image 1.5 model for image editing

Model ID: model_openai-gpt-image-1-5-editing

Capabilities: txt2img, img2img

LLM Markdown: https://app.scenario.com/api/models/model_openai-gpt-image-1-5-editing/markdown

Parameter	Type	Required	Default	Min	Max	Allowed Values	Description
`referenceImages`	file_array	No	-	-	-	-	Reference images for style or content guidance
`prompt`	string	Yes	-	-	-	-	Text prompt for image editing
`numOutputs`	number	No	`1`	1	10	-	Number of images to generate
`aspectRatio`	string	No	`auto`	-	-	`auto`, `1:1`, `3:2`, `2:3`	Aspect ratio for the generated image
`inputFidelity`	string	No	`high`	-	-	`low`, `high`	Preserve details from input images
`quality`	string	No	`high`	-	-	`high`, `medium`, `low`	Generation quality
`background`	string	No	`auto`	-	-	`transparent`, `opaque`, `auto`	Background transparency

GPT Image 2

OpenAI GPT Image 2 for high-fidelity image generation and editing (Modal)

Model ID: model_openai-gpt-image-2

Capabilities: txt2img, img2img

LLM Markdown: https://app.scenario.com/api/models/model_openai-gpt-image-2/markdown

Parameter	Type	Required	Default	Min	Max	Allowed Values	Description
`prompt`	string	Yes	-	-	-	-	Text description of desired generation or edit.
`referenceImages`	file_array	No	-	-	-	-	Reference images for editing. Each image must be under 50 MB.
`mask`	file	No	-	-	-	-	PNG mask for inpainting, same dimensions as the first reference image. OpenAI uses the alpha channel only: fully transparent pixels are edited, fully opaque pixels are preserved. RGB white/black is ignored if there is no alpha. Export PNG with transparency — do not flatten. If you paint a white-on-black mask, convert the white (edit) region to transparent.
`numOutputs`	number	No	`1`	1	10	-	Number of images to generate
`width`	number	No	-	16	3840	-	Output width in pixels.
`height`	number	No	-	16	3840	-	Output height in pixels.
`quality`	string	No	`auto`	-	-	`auto`, `high`, `medium`, `low`	Generation quality
`background`	string	No	`auto`	-	-	`auto`, `opaque`, `transparent`	Background option. Transparent is in Preview.

GPT Image 2.5 Flare

OpenAI GPT Image 2.5 Flare for fast, high-quality everyday image generation and editing.

Model ID: model_openai-gpt-image-2-5-flare

Capabilities: txt2img, img2img

LLM Markdown: https://app.scenario.com/api/models/model_openai-gpt-image-2-5-flare/markdown

Parameter	Type	Required	Default	Min	Max	Allowed Values	Description
`prompt`	string	Yes	-	-	-	-	Text description of desired generation or edit.
`referenceImages`	file_array	No	-	-	-	-	Reference images for editing.
`mask`	file	No	-	-	-	-	PNG mask for inpainting, same dimensions as the first reference image. OpenAI uses the alpha channel only: fully transparent pixels are edited, fully opaque pixels are preserved. RGB white/black is ignored if there is no alpha. Export PNG with transparency — do not flatten. If you paint a white-on-black mask, convert the white (edit) region to transparent.
`numOutputs`	number	No	`1`	1	10	-	Number of images to generate
`width`	number	No	-	16	3840	-	Output width in pixels.
`height`	number	No	-	16	3840	-	Output height in pixels.
`quality`	string	No	`auto`	-	-	`auto`, `low`, `medium`, `high`, `xhigh`, `max`	Generation quality
`background`	string	No	`auto`	-	-	`auto`, `opaque`, `transparent`	Background option.

GPT Image 2.5 Sunburst

OpenAI GPT Image 2.5 Sunburst, the most capable GPT Image model for generation and editing where precision matters most.

Model ID: model_openai-gpt-image-2-5-sunburst

Capabilities: txt2img, img2img

LLM Markdown: https://app.scenario.com/api/models/model_openai-gpt-image-2-5-sunburst/markdown

Parameter	Type	Required	Default	Min	Max	Allowed Values	Description
`prompt`	string	Yes	-	-	-	-	Text description of desired generation or edit.
`referenceImages`	file_array	No	-	-	-	-	Reference images for editing.
`mask`	file	No	-	-	-	-	PNG mask for inpainting, same dimensions as the first reference image. OpenAI uses the alpha channel only: fully transparent pixels are edited, fully opaque pixels are preserved. RGB white/black is ignored if there is no alpha. Export PNG with transparency — do not flatten. If you paint a white-on-black mask, convert the white (edit) region to transparent.
`numOutputs`	number	No	`1`	1	10	-	Number of images to generate
`width`	number	No	-	16	3840	-	Output width in pixels.
`height`	number	No	-	16	3840	-	Output height in pixels.
`quality`	string	No	`auto`	-	-	`auto`, `low`, `medium`, `high`, `xhigh`, `max`	Generation quality
`background`	string	No	`auto`	-	-	`auto`, `opaque`, `transparent`	Background option.