gpt-image-2.5-sunburst open weights and deployment

Status: Unavailable. OpenAI publishes no GPT Image 2.5 weights. Sunburst is served through the Image API (generations and edits) and the Responses API image generation tool.

License
Proprietary hosted model
Hardware note
Not applicable
Recommended runtime
ChinaAPI or the OpenAI API
Verified date
2026-09-24

Published model card

Parameter count
Not disclosed
Context window
Not published; prompts are limited to 32,000 characters
Maximum output
1 to 10 images per request, up to 3840x2160 each (sizes above 2560x1440 are experimental)
Input/output modalities
Text and image input (up to 16 reference images when editing); image output

Official sources