GPT Image 2.5

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What changed in GPT Image 2.5

• Higher reference fidelity — Subjects, distinctive features, lighting, and textures are more likely to remain recognizable after transformation.
• More precise edits — The model is better at changing the requested element while preserving the surrounding subject, composition, and visual treatment.
• More consistent iteration — Successive edits are less likely to undo earlier changes or degrade image quality.
• Faster generation — OpenAI positions Flare as the default choice for most applications and reports up to 50% lower latency than GPT Image 2.
• Better layout handling — Complex visual instructions, transparent backgrounds, and layout-sensitive creative work are more reliable.

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Official editing example

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Key capabilities

• Text-to-image — Generate an image from a natural-language prompt
• Image editing — Apply broad or localized edits to uploaded images
• Flexible dimensions — Use recommended sizes or valid custom WIDTHxHEIGHT dimensions up to 4K
• Expanded quality controls — Select low, medium, high, xhigh, max, or auto
• Transparent output — Request a transparent background with PNG or WebP output
• Multiple outputs — Use n to request more than one result in one generation request

curl --request POST \
  --url https://www.anyfast.ai/v1/images/generations \
  --header 'Authorization: Bearer YOUR_API_KEY' \
  --header 'Content-Type: application/json' \
  --data '{
    "model": "gpt-image-2.5-flare",
    "prompt": "A clean editorial product photograph of a translucent green glass bottle on pale stone, soft morning light",
    "size": "1536x1024",
    "quality": "high",
    "background": "opaque",
    "output_format": "jpeg",
    "output_compression": 85,
    "n": 1
  }'

curl --request POST \
  --url https://www.anyfast.ai/v1/images/edits \
  --header 'Authorization: Bearer YOUR_API_KEY' \
  --form 'model=gpt-image-2.5-sunburst' \
  --form 'image[]=@/path/to/product.png' \
  --form 'prompt=Keep the product unchanged and replace the background with a warm studio gradient' \
  --form 'size=1536x1024' \
  --form 'quality=xhigh' \
  --form 'output_format=png'

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Output controls

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Custom size rules

• Width and height are multiples of 16 pixels.
• The aspect ratio is between 1:3 and 3:1.
• Neither edge exceeds 3,840 pixels.
• Total pixels are between 655,360 and 8,294,400.
• Resolutions above 2560x1440 are experimental.

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Image editing inputs

• Upload a single source image with image, or up to 16 source images with image[].
• Use multipart form uploads rather than public image URLs for the Image API edit endpoint.
• An optional mask must have an alpha channel and match the first source image’s format and dimensions.
• The source image and mask must each be smaller than 50 MB.

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Response handling

echo "$RESPONSE" | jq -r '.data[0].b64_json' | base64 --decode > result.png