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POST
/
v3
/
async
/
veo-3.1-fast-generate-firstlastframe
Veo 3.1 Fast First/Last Frame Video Generation
curl --request POST \
  --url https://api.highwayapi.ai/v3/async/veo-3.1-fast-generate-firstlastframe \
  --header 'Authorization: <authorization>' \
  --header 'Content-Type: <content-type>' \
  --data '
{
  "seed": 123,
  "image": "<string>",
  "prompt": "<string>",
  "last_image": "<string>",
  "resolution": "<string>",
  "aspect_ratio": "<string>",
  "sample_count": 123,
  "enhance_prompt": true,
  "generate_audio": true,
  "negative_prompt": "<string>",
  "duration_seconds": 123,
  "person_generation": "<string>"
}
'
{
  "task_id": "<string>"
}
Generate a video by specifying first-frame and last-frame images together with a text prompt. The model interpolates between the two frames to generate coherent motion content. Uses the Google Veo 3.1 Fast model (veo-3.1-fast-generate-001) for faster generation.
This is an asynchronous API and only returns the asynchronous task’s task_id. You should use this task_id to request the Get Task Result API to retrieve the generated result.

​
Request Headers

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Content-Type
string
required
Enum value: application/json
​
Authorization
string
required
Bearer authentication format: Bearer {{API key}}.

​
Request Body

​
seed
integer
Random seed for deterministic generation. The same seed and parameters will produce the same result.Value range: [0, 4294967295]
​
image
string
required
First-frame image, supporting image URLs or Base64 encoding. Supports JPEG and PNG formats, up to 20MB.
​
prompt
string
required
Text prompt describing the video content and the motion process between the first and last frames.
​
last_image
string
required
Last-frame image, supporting image URLs or Base64 encoding. Supports JPEG and PNG formats, up to 20MB.
​
resolution
string
default:"720p"
Output video resolution.Allowed values: 720p, 1080p
​
aspect_ratio
string
default:"16:9"
Video aspect ratio. 16:9 is landscape, and 9:16 is portrait.Allowed values: 16:9, 9:16
​
sample_count
integer
default:1
Number of videos to generate, ranging from 1 to 4.Value range: [1, 4]
​
enhance_prompt
boolean
default:true
Whether to enhance the input prompt to improve generation quality.
​
generate_audio
boolean
default:false
Whether to generate an audio track.
​
negative_prompt
string
Negative prompt describing content you do not want to appear in the video.
​
duration_seconds
integer
default:8
Video duration in seconds. Options: 4, 6, or 8 seconds.Allowed values: 4, 6, 8
​
person_generation
string
default:"allow_adult"
Person generation control. allow_adult: allow generating adults; disallow: prohibit generating people.Allowed values: allow_adult, disallow

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Response Information

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task_id
string
Use task_id to request the Get Task Result API to retrieve the generated output.