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GPT Image 1.5 is OpenAI’s latest image generation model built on the GPT-5 architecture, available through AnyFast API. It is 4x faster and 20% cheaper than GPT Image 1, with improved text rendering and editing precision.

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Key capabilities

  • Text-to-Image — Generate images from natural language descriptions
  • Image editing — Edit existing images with precise instructions
  • Enhanced text — Dense text, small lettering, infographics, and UI mockups
  • World knowledge — Context-aware generation with built-in reasoning
  • Transparent background — Generate images with transparent backgrounds
  • Batch generation — Generate up to 4 images per request

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Output specifications

PropertyValue
Sizes1024x1024, 1536x1024, 1024x1536, auto
Qualitylow, medium, high
Formatspng, webp, jpeg
Backgroundtransparent, opaque

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Quick example

curl https://www.anyfast.ai/v1/images/generations \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-image-1.5",
    "prompt": "A cute cat wearing a space suit floating in the galaxy",
    "size": "1024x1024",
    "quality": "high"
  }'

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Parameters

ParameterTypeRequiredDescription
modelstringYesMust be gpt-image-1.5
promptstringYesText description of the desired image
nintegerNoNumber of images to generate (1–4). Default: 1
sizestringNo1024x1024, 1536x1024, 1024x1536, auto. Default: auto
qualitystringNolow, medium, high. Default: medium
output_formatstringNopng, webp, jpeg. Default: png
backgroundstringNotransparent or opaque. Default: opaque
moderationstringNoauto or low. Default: auto
output_compressionintegerNoCompression level for jpeg/webp (0–100).

API Reference

View the interactive API playground for GPT Image 1.5.