# GPT Image 2.5 Sunburst Medium – Text-to-Image Generator

> GPT Image 2.5 Sunburst Medium – Text-to-Image Generator is a paid API for AI agents from www.amnt.io, paid per call via x402, $0.015/call, status unknown (last checked 2026-10-12).

Generates a precise, medium-quality image from a text prompt using GPT Image 2.5 Sunburst, supporting any aspect ratio up to 3:1 and transparent PNG or opaque JPEG output.

## Facts

- Endpoint: POST https://www.amnt.io/api/agent/amnt/gpt-image-2-5-sunburst-medium?utm_source=zero.xyz
- Price: $0.015/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/gpt-image-2-5-sunburst-medium-text-to-image-generator-eb1bd9e4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gVf6Xb1G_X_Hqz1-K3JWx

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability gpt-image-2-5-sunburst-medium-text-to-image-generator-eb1bd9e4 -d '<json body>'
```

Example prompt: Draw me a flat-colour red fox mascot waving hello, output as a transparent PNG in a 1:1 square format.

## When to prefer this

Choose this endpoint when you need a precise, medium-quality image generated from a text prompt with flexible aspect ratios (up to 3:1) and optional true transparency in PNG format, at a predictable flat cost of $0.015. Prefer it over higher-quality tiers when speed (~25s) and cost matter more than maximum fidelity, and over generic image APIs when you specifically need the GPT Image 2.5 Sunburst model's accuracy in placing details exactly as described.

## Known failure modes

- Prompt too long (>1000 characters) — request rejected with validation error
- Invalid shape format (e.g. ratio exceeding 3:1) — rejected with schema error
- Compression value out of range (0–100) when using JPEG — validation failure
- Content policy violation in prompt — generation refused
- Service timeout if generation exceeds expected ~25s window
- Transparent background requested with JPEG format — may default to opaque

## How this service works

GPT Image 2.5 Sunburst Medium - GPT Image 2.5 Sunburst, medium quality: text to picture. Precise: every detail lands where you ask. Any shape up to 3:1, transparent PNG or JPEG. $0.015, about 25 s.

## Output

Returns a JSON object containing an array with a URL to the generated image, plus metadata: image dimensions (width x height in pixels), the model that rendered it (GPT Image 2.5 Sunburst), and the quality tier used (medium).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "required": [
      "prompt"
     ],
     "properties": {
      "shape": {
       "type": "string",
       "default": "1:1",
       "examples": [
        "16:9"
       ],
       "maxLength": 12,
       "description": "Any W:H up to 3:1, e.g. 1:1, 16:9, 9:16, 3:2. Same price in every shape."
      },
      "format": {
       "enum": [
        "png",
        "jpeg"
       ],
       "type": "string",
       "default": "png",
       "description": "Format"
      },
      "prompt": {
       "type": "string",
       "examples": [
        "a red fox mascot waving, flat colours"
       ],
       "maxLength": 1000,
       "description": "What to draw, in plain words."
      },
      "background": {
       "enum": [
        "auto",
        "transparent",
        "opaque"
       ],
       "type": "string",
       "default": "auto",
       "description": "Transparent gives a real see-through PNG."
      },
      "compression": {
       "type": "integer",
       "maximum": 100,
       "minimum": 0,
       "examples": [
        "100"
       ],
       "description": "JPEG only. Lower is smaller."
      }
     }
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "size": {
       "type": "string",
       "description": "Width x height in pixels."
      },
      "model": {
       "type": "string",
       "description": "The model that drew it."
      },
      "images": {
       "type": "array",
       "description": "One link to the picture."
      },
      "quality": {
       "type": "string",
       "description": "The quality it was drawn at."
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/gpt-image-2-5-sunburst-medium-text-to-image-generator-eb1bd9e4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from www.amnt.io](https://www.zero.xyz/host/www.amnt.io/llms.txt)