October 3, 2025

LTX Studio API v1 major update:

  • New endpoint POST images/upscale to upscale previously generated images to higher resolution
  • New AI models for image generation and editing:
  • New parameters for both edit and create endpoints:
    • model - select AI model: flux, flux-premium, nano-banana
    • location - location description, max 2000 chars
    • weather - weather conditions description, max 2000 chars
    • lighting - lighting description, max 2000 chars
    • referenceAssetId2 - second reference image, all models
    • referenceAssetId3 - third reference image, flux-premium and nano-banana only
  • Endpoint renames, backward compatible:
    • images/flux-edit renamed to images/edit, old name still supported
    • images/flux-create renamed to images/create, old name still supported

Examples

Model Nano Banana / Gemini 2.5 Flash Image

curl --location 'https://api.useapi.net/v1/ltxstudio/images/create' \
--header 'Authorization: Bearer user:12345-…' \
--form 'prompt="A large billboard on the right side of the freeway that reads: \"Don'\''t worry, Be Happy.\" The billboard is at Hollywood and Vine, Hollywood, California. Use bold, friendly font that is easy to read from distance."' \
--form 'aspectRatio="1:1"' \
--form 'location="Hollywood and Vine, Hollywood, California"' \
--form 'weather="bright sunny day"' \
--form 'lighting="beautiful California sunshine"' \
--form 'model="nano-banana"'

Result

Model FLUX.1 Kontext Max

curl --location 'https://api.useapi.net/v1/ltxstudio/images/create' \
--header 'Authorization: Bearer user:12345-…' \
--form 'prompt="A large billboard on the right side of the freeway that reads: \"Don'\''t worry, Be Happy.\" The billboard is at Hollywood and Vine, Hollywood, California. Use bold, friendly font that is easy to read from distance."' \
--form 'aspectRatio="16:9"' \
--form 'location="Hollywood and Vine, Hollywood, California"' \
--form 'weather="bright sunny day"' \
--form 'lighting="beautiful California sunshine"' \
--form 'model="flux-premium"'

Result

referenceAssetId • Lady with the red hair
referenceAssetId2 • BMW classic motorcycle
referenceAssetId3 • The Golden Gate

Model Nano Banana / Gemini 2.5 Flash Image

curl --location 'https://api.useapi.net/v1/ltxstudio/images/edit' \
--header 'Authorization: Bearer user:12345-…' \
--form 'prompt="The red-haired lady with sleeve tattoos sitting on the vintage motorcycle on the beach. She is wearing revealing crop top, cropped denim jacket, short denim shorts and looking directly into camera. Visible motorcycle tire tracks in the sand extending behind the rear motorcycle tire"' \
--form 'shotType="wide shot"' \
--form 'referenceAssetId="asset:…-type:image/jpeg"' \
--form 'referenceAssetId2="asset:…-type:image/jpeg"' \
--form 'referenceAssetId3="asset:…-type:image/jpeg"' \
--form 'model="nano-banana"'

Result

Model FLUX.1 Kontext

curl --location 'https://api.useapi.net/v1/ltxstudio/images/edit' \
--header 'Authorization: Bearer user:12345-…' \
--form 'prompt="The red-haired lady with sleeve tattoos sitting on the vintage motorcycle on the beach. She is wearing revealing crop top, cropped denim jacket, short denim shorts and looking directly into camera. Visible motorcycle tire tracks in the sand extending behind the rear motorcycle tire"' \
--form 'aspectRatio="16:9"' \
--form 'shotAngle="eye-level"' \
--form 'shotType="wide shot"' \
--form 'referenceAssetId="asset:…-type:image/jpeg"' \
--form 'referenceAssetId2="asset:…-type:image/jpeg"' \
--form 'model="flux"'

Result 

curl --location 'https://api.useapi.net/v1/ltxstudio/images/upscale' \
--header 'Authorization: Bearer user:12345-…' \
--form 'jobId="email:[email protected]:…-type:image"'

Result