# GPT Image 2.5 Sunburst

GPT Image 2.5 Sunburst is a image generation model from OpenAI, available through the Impossibl API. Its published context window is 32,000 tokens. The advertised input rate is $5.00 per million input tokens. The advertised output rate is $30.00 per million output tokens.

- Model identifier: ` openai/gpt-image-2.5-sunburst `
- Creator: OpenAI
- Model type: Image generation
- Canonical model page: [GPT Image 2.5 Sunburst](<https://impossibl.com/openai/gpt-image-2.5-sunburst>)
- API availability: Listed as serving through Impossibl.
- Creator release date: 2026-09-08

## Capabilities and limits

- Context window: 32,000 tokens
- Maximum output tokens: Not published in the public catalog; this is separate from the context window.
- Inputs: text
- Outputs: images
- Tool calling: Not published

## API access

Use ` openai/gpt-image-2.5-sunburst ` as the model identifier through the Impossibl API.

Published API endpoints:

- ` /v1/images/generations `

[API quickstart](<https://impossibl.com/docs/agent-quickstart>) · [Models and billing documentation](<https://impossibl.com/docs/models>)

## Published API prices

All rates are in USD. An unpublished rate is unknown, not zero. Workspace-specific pricing, taxes, balance-purchase fees, billing adjustments, and tool charges can affect the amount paid.

| Usage | Published base rate | Billing unit |
| --- | --- | --- |
| Input | $5.00 | per million input tokens |
| Output | $30.00 | per million output tokens |
| Cache read | Not published | per million cached input tokens |
| Cache write (default retention) | Not published | per million tokens |
| Cache write (one-hour retention) | Not published | per million tokens |
| Audio input | Not published | per million audio input tokens |

## Independent benchmarks

Source: [Artificial Analysis](<https://artificialanalysis.ai/>). Last checked: 2026-09-11T10:19:11.718Z.
Configurations are evaluated separately. API scores retain their original units. Unmeasured scores are omitted.

### GPT Image 2.5 Sunburst (max) (text-to-image)

Source: [Evaluation source](<https://artificialanalysis.ai/api/v2/media/text-to-image/models/free>)

| Benchmark | Score |
| --- | --- |
| Arena Elo | 1180.00 |

### GPT Image 2.5 Sunburst (max) (image-editing)

Source: [Evaluation source](<https://artificialanalysis.ai/api/v2/media/image-editing/models/free>)

| Benchmark | Score |
| --- | --- |
| Arena Elo | 1168.00 |

Full benchmark data and breakdowns: [Complete benchmark snapshot](<https://api.impossibl.com/v1/models/openai/gpt-image-2.5-sunburst/benchmarks>).


## Availability and retirement

The model is listed as serving. No retirement is announced in the current public catalog.

## Frequently asked questions

### What is GPT Image 2.5 Sunburst?

GPT Image 2.5 Sunburst is a image-generation model from OpenAI, available through the Impossibl API.

### How much does GPT Image 2.5 Sunburst cost?

GPT Image 2.5 Sunburst costs $5.00 per million input tokens and $30.00 per million output tokens through the Impossibl API. All rates are in USD.

### What is the context length of GPT Image 2.5 Sunburst?

GPT Image 2.5 Sunburst has a 32,000-token context window through the Impossibl API.

### What inputs and outputs does GPT Image 2.5 Sunburst support?

GPT Image 2.5 Sunburst accepts text as input. GPT Image 2.5 Sunburst returns images.

### How do I use GPT Image 2.5 Sunburst through an API?

GPT Image 2.5 Sunburst is available through the Impossibl API. Use openai/gpt-image-2.5-sunburst as the model identifier with /v1/images/generations. The quickstart explains how to create an API key and send your first request.

### When was GPT Image 2.5 Sunburst released?

OpenAI released GPT Image 2.5 Sunburst on September 8, 2026.

Sources: [Creator release announcement](<https://openai.com/index/introducing-chatgpt-images-2-5/>)

## Sources and related links

Prices, limits, capabilities, endpoints, and availability come from the public Impossibl catalog. Creator documentation supplies descriptions and release dates where available; it does not override the published API offering.

- [Public Impossibl model catalog](<https://api.impossibl.com/v1/models>)
- [Full model directory as JSON](<https://impossibl.com/models.json>)
- [GPT Image 2.5 Sunburst: model details and pricing](<https://impossibl.com/openai/gpt-image-2.5-sunburst>)
- [Model directory](<https://impossibl.com/models>)