Gemini Omni Flash 1.1 Video

Generate short text-to-video, frames-to-video, and reference-to-video clips with Google’s Gemini Omni Flash 1.1 video model. Omni Flash 1.1 supports everything the original Omni Flash does, plus a native 360p tier at half the 720p price — ideal for drafts, previews, and high-volume workflows. See the Gemini Omni Flash 1.1 model overview on unifically.com.

Model

google/gemini-omni-flash-1.1-video

Parameters

Parameter	Type	Required	Default	Description
`prompt`	string	Yes	-	Main video prompt. Use `@ImageN` or `@CharacterN` to point at specific references. Unknown references are left as plain text.
`seed`	integer	No	Random	Seed sent to Gemini Omni Flash 1.1. If omitted, a seed is generated automatically and returned when available.
`aspect_ratio`	string	No	`"16:9"`	Output orientation. Allowed: `"16:9"`, `"9:16"`.
`duration`	integer	No	`4`	Clip length in seconds. Allowed: `4`, `6`, `8`, `10`.
`resolution`	string	No	`"720p"`	Output resolution. Allowed: `"360p"`, `"720p"`, `"1080p"`, `"4k"`. `"360p"` and `"720p"` generate natively — 360p at half the 720p price. With `"1080p"` or `"4k"`, the video generates at 720p and is upscaled as part of the same task before it completes. A completed 360p video can be upscaled to 720p (only) with the upscale endpoint.
`start_image_url`	string	No	-	Publicly reachable image URL used as the first frame. Cannot be combined with `reference_image_urls` or `reference_characters`.
`end_image_url`	string	No	-	Publicly reachable image URL used as the last frame. Requires `start_image_url`; the clip animates from the first frame to the last frame. Cannot be combined with `reference_image_urls` or `reference_characters`.
`reference_image_urls`	string[]	No	-	Publicly reachable image reference URLs. Max 7 total expanded image + character image URLs. Cannot be combined with start/end frame fields.
`reference_characters`	array	No	-	Character references. Max 3 character items; expanded character image URLs count toward the total 7 reference limit.
`voice`	string	No	-	Request-level Google Flow voice preset ID. Requires at least one image or character reference. See available voices.
`allow_audio_filtered`	boolean	No	`false`	When `true`, the generation runs without audio instead of failing when the audio track is filtered.
`nsfw_check`	boolean	No	`true`	Check uploaded media inputs for NSFW content

The 360p tier costs half the 720p price at every duration. Completed videos are upscaled with google/veo-3.1-upscale — the same upscaler serves Omni Flash; pass this task’s task_id. A 360p video can be upscaled to 720p only (not directly to 1080p or 4k); a 720p video can be upscaled to 1080p or 4k. If you know the target up front, request "1080p" or "4k" on the generation itself (it generates at 720p and upscales automatically in the same task).

Frame mode and reference mode are separate generation modes. Do not combine start_image_url/end_image_url with reference_image_urls or reference_characters.

Character References

Each character must be an object with image_urls. Even one-image characters must use an array.

{
  "image_urls": [
    "https://example.com/character-front.png",
    "https://example.com/character-profile.png"
  ],
  "name": "Ada",
  "description": "warm, sharp, curious"
}

Field	Type	Required	Description
`image_urls`	string[]	Yes*	Publicly reachable character image URLs. Use 1-10 images for a character entity.
`name`	string	No	Display name for the character.
`description`	string	No	Character notes/personality text.

*image_urls must contain at least one URL.

Example — 360p Draft

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "google/gemini-omni-flash-1.1-video",
    "input": {
      "prompt": "A paper boat drifts down a rainy street gutter, cinematic close-up",
      "duration": 4,
      "resolution": "360p",
      "aspect_ratio": "9:16"
    }
  }'

Example — First + Last Frame

Provide both frames and the clip animates from start_image_url to end_image_url.

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "google/gemini-omni-flash-1.1-video",
    "input": {
      "prompt": "The flower blooms in a smooth timelapse",
      "start_image_url": "https://example.com/bud.jpg",
      "end_image_url": "https://example.com/bloom.jpg",
      "aspect_ratio": "16:9",
      "duration": 8
    }
  }'

Example — Reference-to-Video

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "google/gemini-omni-flash-1.1-video",
    "input": {
      "prompt": "Make @Character1 and @Image1 dance in a neon studio with energetic camera movement.",
      "reference_image_urls": [
        "https://example.com/neon-studio.png"
      ],
      "reference_characters": [
        {
          "image_urls": [
            "https://example.com/dancer.png"
          ],
          "name": "Dancer"
        }
      ],
      "duration": 10,
      "aspect_ratio": "9:16"
    }
  }'

Prompt References

Token	Refers to
`@Image1`, `@Image2`	Items from `reference_image_urls` only
`@Character1`, `@Character2`	Items from `reference_characters` only. With multiple `image_urls`, the token points to the character item; extra images are identity references

Rejected Combinations

Input	Why rejected
`end_image_url` without `start_image_url`	The last frame requires a first frame.
`start_image_url`/`end_image_url` with `reference_image_urls` or `reference_characters`	Frame mode and reference mode are separate generation modes.
More than 7 total expanded image URLs	Gemini Omni Flash generation reference limit.
More than 3 character items	Character item limit.
`image_url` on a character	Use `image_urls` instead, even for one image.
Plain string character entries	Character entries must be objects with `image_urls`.
Empty `image_urls`	A character needs at least one image.
More than 10 `image_urls` on one character	Character entity image limit.

Response

{
  "code": 200,
  "success": true,
  "data": {
    "task_id": "abc123def456",
    "status": "processing"
  }
}

Volume discounts are available for almost all models. Reach out at contact@unifically.com to discuss custom pricing.

​Model

​Parameters

​Character References

​Example — 360p Draft

​Example — First + Last Frame

​Example — Reference-to-Video

​Prompt References

​Rejected Combinations

​Response

Model

Parameters

Character References

Example — 360p Draft

Example — First + Last Frame

Example — Reference-to-Video

Prompt References

Rejected Combinations

Response