As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/m/gpt-image-2-5-sunburst/

# GPT Image 2.5 Sunburst

OpenAI, GPT Image family. Status: current. Type: image generation. Released: 2026-09-08.

## How to call it

| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| OpenAI API | `gpt-image-2.5-sunburst` | https://api.openai.com/v1/images/generations | https://developers.openai.com/api/docs/models/gpt-image-2.5-sunburst |
| Azure OpenAI (Microsoft Foundry) | `gpt-image-2.5-sunburst` |  | https://learn.microsoft.com/en-us/azure/foundry/foundry-models/concepts/models-sold-directly-by-azure |
| Web app |  |  | https://chatgpt.com |
| ElevenLabs Image & Video API | `gpt-image-2.5-sunburst` | /image/create | https://elevenlabs.io/docs/overview/capabilities/image-video |

## Pricing

- Text input: $5 per 1M tokens
- Cached text input: $1.25 per 1M tokens
- Image input: $8 per 1M tokens
- Cached image input: $2 per 1M tokens
- Image output: $30 per 1M tokens
- Unit as published: per 1M tokens (USD)
- Source: https://developers.openai.com/api/docs/pricing
- Last checked: 2026-09-29

## Specs

- Input: text, image
- Output: image
- Context window: not published
- Max output: not published
- Open weights: no
- Licence: proprietary

## Where it stands

- Newer image generation models in the registry since its release: 7. The 5 newest:
  - GPT Image 2.6 Flare (2026-11-04) https://postcutoff.com/m/gpt-image-2-6-flare/
  - GPT Image 2.6 Sunburst (2026-11-04) https://postcutoff.com/m/gpt-image-2-6-sunburst/
  - MOSS-Image (2026-10-16) https://postcutoff.com/m/moss-image/
  - FLUX 3 Image Klein (2026-10-15) https://postcutoff.com/m/flux-3-image-klein/
  - Krea 3 (Fast / High / Ultra modes) (2026-10-15) https://postcutoff.com/m/krea-3/
- Before it from OpenAI: GPT Image 2 (2026-04-21) https://postcutoff.com/m/gpt-image-2/
- After it from OpenAI: GPT Image 2.6 Sunburst (2026-11-04) https://postcutoff.com/m/gpt-image-2-6-sunburst/
- Closed weights; access is hosted only.

## What stands out

- Most capable OpenAI image model: Top-quality generation and editing with inpainting via images/generations and images/edits. Source: https://developers.openai.com/api/docs/models/gpt-image-2.5-sunburst
- Replacement for gpt-image-1.5/1-mini (found after launch): Named successor for image models shutting down Dec 1 2026. Source: https://developers.openai.com/api/docs/deprecations

## Notes

Snapshot gpt-image-2.5-sunburst-2026-09-08. OpenRouter id not verified. Sizes (OpenAI image-generation guide, read 2026-10-25): recommended 1024x1024, 1536x1024, 1024x1536; custom sizes allowed if both edges are multiples of 16, aspect ratio between 1:3 and 3:1, no edge above 3840 px and 655,360-8,294,400 total pixels, above 2560x1440 experimental. 16:9: the guide names 1536x864 as an example; 1792x1008 and 2048x1152 satisfy the same rules (not named in the guide, not tested by us). Guide: https://developers.openai.com/api/docs/guides/image-generation

```bash
curl https://api.openai.com/v1/images/generations \
 -H "Authorization: Bearer $OPENAI_API_KEY" -H "Content-Type: application/json" \
 -d '{"model":"gpt-image-2.5-sunburst","prompt":"a lighthouse at dawn"}'
```

Sources:
- https://developers.openai.com/api/docs/models/gpt-image-2.5-sunburst
- https://developers.openai.com/api/docs/pricing
- https://developers.openai.com/api/docs/changelog
- Models overview: https://developers.openai.com/api/docs/models

Model page: https://postcutoff.com/m/gpt-image-2-5-sunburst/