Gemini Omni Flash 1.2 Video

Generate text-to-video, frames-to-video, and reference-to-video clips with Google’s Gemini Omni 1.2 Flash, released November 6, 2026. Compared with 1.1 it takes any whole-second length from 3 to 15 seconds, follows character and scene references more closely, gives better control over jump cuts, and renders sharper visuals. The request body is the same as Gemini Omni Flash 1.1 Video, so moving over is a change of the model string. Try it in the browser: Gemini Omni Flash 1.2 API playground.

Model

google/gemini-omni-flash-1.2-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 for reproducible results, `0` to `2147483647`. If omitted, a seed is generated automatically and returned when available.
`duration`	integer	No	`4`	Clip length in seconds. Any whole number from `3` to `15`. First + last frame mode allows up to `10`.
`resolution`	string	No	`"720p"`	Output resolution. Allowed: `"360p"`, `"720p"`, `"1080p"`, `"4k"`. `"360p"` and `"720p"` generate natively. With `"1080p"` or `"4k"`, the video is upscaled after generation as part of the same task.
`aspect_ratio`	string	No	`"16:9"`	Output orientation. Allowed: `"16:9"`, `"9:16"`.
`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. Max `duration` is `10` in this mode.
`reference_image_urls`	string[]	No	-	Publicly reachable image reference URLs. Max 7. Cannot be combined with start/end frame fields.
`reference_characters`	array	No	-	Character references. Max 3 character items. Refer to them in the prompt as `@Character1`, `@Character2`, `@Character3`.
`voice`	string or string[]	No	-	Google voice preset ID, or an array of up to 5 IDs. Requires at least one reference image or character. 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	`false`	Check the prompt and input images for NSFW content before generating. Off unless set to `true`

Price depends on duration and resolution: every whole second from 3 to 15 has its own price at each resolution. 360p is the cheapest draft tier. See current rates on the pricing page.

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 — 7 Second Character Clip

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-1.2-video",
    "input": {
      "prompt": "@Character1 walks into a sunlit bakery and picks up a croissant. Cut to a close-up of her first bite.",
      "reference_characters": [
        {
          "image_urls": [
            "https://example.com/mia.png"
          ],
          "name": "Mia"
        }
      ],
      "voice": "kore",
      "duration": 7,
      "resolution": "720p",
      "aspect_ratio": "9:16"
    }
  }'

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-1.2-video",
    "input": {
      "prompt": "A paper boat drifts down a rainy street gutter, cinematic close-up",
      "duration": 13,
      "resolution": "360p",
      "aspect_ratio": "16:9"
    }
  }'

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-1.2-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": 6
    }
  }'

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
`duration` below 3, above 15, or not a whole number	Allowed lengths are whole seconds from 3 to 15.
`end_image_url` with `duration` above 10	First + last frame mode is capped at 10 seconds.
`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 `reference_image_urls`	Reference image limit.
More than 3 character items	Character item limit.
More than 5 voices, or `voice` with no reference image or character	Voice presets need a reference to attach to.
`image_url` on a character	Use `image_urls` instead, even for one image.
Empty `image_urls`, or more than 10 on one character	A character needs 1-10 images.

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 — 7 Second Character Clip

​Example — 360p Draft

​Example — First + Last Frame

​Prompt References

​Rejected Combinations

​Response

Model

Parameters

Character References

Example — 7 Second Character Clip

Example — 360p Draft

Example — First + Last Frame

Prompt References

Rejected Combinations

Response