Gemini Omni Flash

Endpoint

POST https://api.roasos.com/v1/video/gemini-omni-flash

Send your API key as a bearer token. The key needs the scope api:write. Every paid request also needs an Idempotency-Key header.

The envelope fields quote_only, quote_id, webhook_url and wait_timeout_seconds behave the same on each model endpoint. Refer to Jobs and Quotes and credits.

Good at

The model is grounded in Gemini world knowledge, so plain cause-and-effect action renders coherently. Audio is always on: the model lip-syncs a script and adds sound; there is no audio switch and no audio-off discount. You cannot send an audio file: no endpoint takes a voice or a soundtrack. Reference images bind to roles with inline <IMAGE_REF_0>, <IMAGE_REF_1> tags, so one prompt can point at a person, a product and a location. Camera words are taken literally ("one continuous shot", "locked off", "push in"), and on-screen text is a strength. The resolution field sets the output tier and the price: 360p, 720p, 1080p or 4k, billed per output second. In image-to-video, end_image_url pins the last frame; with a last frame the clip is at most 10 seconds. Reference clips (video_urls, up to three, each at most 15 seconds) carry motion and choreography: "the dog performs the dance from <VIDEO_REF_0>". A lone clip with no references is a video edit instead. It is not the fidelity leader for image-to-video talking heads; use Kling 4.0 or Seedance for those. Video edit from a source video is a separate endpoint (/v1/video-edit/gemini-omni-flash).

Pricing

The unit is one clip. Pricing key: gemini-omni-flash.

The credits come from the roasOS pricing table. No other field changes the price. To get the exact price of your request, send it with quote_only: true first.

Modes

• text-to-video
• image-to-video
• reference-to-video

roasOS selects the mode from the media fields of your request. You do not send a mode.

Provider endpoints: google/gemini-omni-flash/v1.2/image-to-video · google/gemini-omni-flash/v1.2/reference-to-video · google/gemini-omni-flash/v1.2/text-to-video.

Request fields

The schema is strict. A field that is not in this table gets 400 unsupported_option. The field names are the roasOS role names. One role has one name in every family.

Media

This endpoint accepts these media roles:

• avatar_id — identity; the saved character reference sheet, with a derived portrait only where the model requires a single face or source frame
• references — style and appearance references
• image_url — first frame (or the single source image)
• end_image_url — last frame
• scene_id — first frame — a scene this workspace owns
• video_urls — reference videos

Every other role is refused: elements, product_id, product_images, reference_images, scene_image, video_url, audio_urls, audio_url, voice_id. A refused role gets 400 unsupported_option.

Prompt

Limit 10,000 characters including the roasOS route-facts block (ROUTE-VERIFIED FEATURE FACTS: with lines for the first frame, the references, the character and the outfit) and the appended <IMAGE_REF_n> tags. fal accepts 20,000; 10,000 is the roasOS cap.

• Describe cause-and-effect motion plainly; the model renders physics coherently.
• Place <IMAGE_REF_0> inline to bind a reference to a role ("the jar in <IMAGE_REF_1>"); unbound references are appended.
• Camera words are literal: "one continuous shot", "locked off", "natural smartphone zoom".
• Use negative instructions to control additions: "No music, just realistic sound", "Don't add text".
• When you give dialogue or audio direction, keep it explicit; when you give none, the model still adds sound.
• Only 16:9 and 9:16, 3–15 s (10 s with a last frame): keep the action tight enough to resolve inside the clip.

Not exposed

These catalog entries describe omitted inputs, pinned values and source constraints. They do not imply that the provider accepts every listed field.

• duration_seconds — these values are not available: 3, 4, 6, 7, 9.
• prompt — pinned to characters 10,001–20,000.
• generate_audio — pinned to always on; no switch and no audio-off price.
• seed — not accepted by this public endpoint.
• negative_prompt — not accepted by this public endpoint.
• cfg_scale — not accepted by this public endpoint.
• shot_type — not accepted by this public endpoint.
• multi_prompt — not accepted by this public endpoint.
• video_url — not accepted by this public endpoint.

Result

The result kind is video. Always present: url.

{
  "data": {
    "id": "gen_…",
    "kind": "video",
    "model": "gemini-omni-flash",
    "status": "completed",
    "result": {
      "url": "https://cdn.roasos.com/workspaces/ws_01/result"
    }
  }
}

The files are immutable objects on https://cdn.roasos.com. A result URL is a valid media input for your next request.

Example

The three steps are always the same: quote, run, poll.

# 1. Quote. Nothing is spent.
curl -X POST https://api.roasos.com/v1/video/gemini-omni-flash \
  -H "Authorization: Bearer roasos_sk_live_..." \
  -H "Idempotency-Key: 0f1c9e2a-gemini-omni-flash-0001" \
  -H "Content-Type: application/json" \
  -d '{"quote_only":true,"prompt":"A woman holds the bottle at eye level in a bright kitchen, morning light, static camera."}'
# 200 { "data": { "kind": "quote", "quote_id": "q_7Hk...", "credits": 3, "expires_at": "...",
#        "confirmation": { "model": "gemini-omni-flash", "example": "3s_720p" } } }

# 2. Run. Same body, same Idempotency-Key, quote_id in place of quote_only.
curl -X POST https://api.roasos.com/v1/video/gemini-omni-flash \
  -H "Authorization: Bearer roasos_sk_live_..." \
  -H "Idempotency-Key: 0f1c9e2a-gemini-omni-flash-0001" \
  -H "Content-Type: application/json" \
  -d '{"quote_id":"q_7Hk...","prompt":"A woman holds the bottle at eye level in a bright kitchen, morning light, static camera."}'
# 201 { "data": { "id": "gen_...", "status": "queued", "credits_reserved": 3 } }

# 3. Poll, then read the result.
curl https://api.roasos.com/v1/jobs/gen_.../status -H "Authorization: Bearer roasos_sk_live_..."
curl https://api.roasos.com/v1/jobs/gen_.../result -H "Authorization: Bearer roasos_sk_live_..."

The deprecated path

POST /v1/generations still reaches this model for one minor version. It is deprecated. This is how it maps:

POST /v1/generations { "type": "video", "model": "gemini-omni-flash", "options": { prompt, image, reference_images (≤ 9), duration (3–15), aspect_ratio, resolution (360p|720p|1080p|4k) } }. avatar_id, product_id and avatar_outfit are app-only today.

See also

• llms.txt for this model — the same facts as one plain-text file for an agent.
• GET https://api.roasos.com/v1/catalog/gemini-omni-flash — the machine-readable form: enums, defaults, limits and prices. Refer to the API reference.
• Jobs — how to poll a job and read its result.
• Provider endpoints: google/gemini-omni-flash/v1.2/image-to-video · google/gemini-omni-flash/v1.2/reference-to-video · google/gemini-omni-flash/v1.2/text-to-video.