--- title: "Gemini Omni Flash" description: "Gemini Omni Flash 1.2 makes video with synchronized audio at 360p to 4K, 3 to 15 seconds long, from text, a first frame (with an optional last frame), or a reference set: up to ten images bound with `` tags plus up to three clips of at most 15 seconds bound with `` tags. It is best at coherent physics, on-screen text and literal camera direction." url: https://docs.roasos.com/models/video/gemini-omni-flash --- # Gemini Omni Flash Family `video` · model `gemini-omni-flash` · catalog `model-catalog@2026-10-06.v5` · pricing `customer-pricing@2026-11-05.v15` . ## Endpoint ```http 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](/concepts/jobs) and [Quotes and credits](/concepts/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 ``, `` 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 ``". 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`. | Request | Credits | | ---------- | ------- | | `3s_720p` | 3 | | `9s_720p` | 9 | | `15s_720p` | 15 | 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 | Field | Type | Required | Default | Rule | | ------------------------- | ------------ | -------- | ------- | --------------------------------------------------------------------- | | `aspect_ratio` | enum | no | `16:9` | `9:16`, `16:9` | | `avatar_id` | string | no | — | UUID; only in `reference-to-video` | | `avatar_outfit` | string | no | — | ≤ 500 characters | | `duration_seconds` | integer enum | no | `5` | `3`, `4`, `5`, `6`, `7`, `8`, `9`, `10`, `11`, `12`, `13`, `14`, `15` | | `end_image_url` | string | no | — | https URL; ≤ 4,096 characters; only in `image-to-video` | | `extend_of_generation_id` | string | no | — | UUID | | `image_url` | string | no | — | https URL; ≤ 4,096 characters; only in `image-to-video` | | `mode` | enum | no | — | `text-to-video`, `image-to-video`, `reference-to-video` | | `prompt` | string | yes | — | ≥ 1 character; ≤ 10,000 characters | | `quote_id` | string | no | — | UUID | | `quote_only` | boolean | no | `false` | — | | `references` | string\[] | no | — | 1–10 items; only in `reference-to-video` | | `resolution` | enum | no | `720p` | `360p`, `720p`, `1080p`, `4k` | | `scene_id` | string | no | — | UUID | | `video_urls` | string\[] | no | — | 1–3 items; only in `reference-to-video` | | `wait_timeout_seconds` | integer | no | `0` | 0–60 | | `webhook_url` | string | no | — | https URL; ≤ 4,096 characters | 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 | Role | Items | Maximum size | Content types | Duration | | --------------- | ----- | ------------ | --------------------------------------- | -------- | | `end_image_url` | ≤ 1 | 10 MB | `image/jpeg`, `image/png`, `image/webp` | — | | `image_url` | ≤ 1 | 10 MB | `image/jpeg`, `image/png`, `image/webp` | — | | `references` | ≤ 10 | 10 MB | `image/jpeg`, `image/png`, `image/webp` | — | | `video_urls` | ≤ 3 | 100 MB | `video/mp4` | 0–15 s | 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`. Each media URL must be an immutable object on `https://cdn.roasos.com` that your workspace owns. Any other URL gets `400 reference_media_not_workspace_owned` . Refer to [Reference media and uploads](/concepts/reference-media) to learn how to put a file there. ## 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 `` tags. fal accepts 20,000; 10,000 is the roasOS cap. * Describe cause-and-effect motion plainly; the model renders physics coherently. * Place `` inline to bind a reference to a role ("the jar in \"); 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`. ```json { "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. cURL JavaScript Python ```bash # 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_..." ``` ```javascript const key = process.env.ROASOS_API_KEY; const url = "https://api.roasos.com/v1/video/gemini-omni-flash"; const idempotencyKey = "0f1c9e2a-gemini-omni-flash-0001"; const input = { "prompt": "A woman holds the bottle at eye level in a bright kitchen, morning light, static camera." }; const post = (payload) => fetch(url, { method: "POST", headers: { Authorization: `Bearer ${key}`, "Idempotency-Key": idempotencyKey, "Content-Type": "application/json", }, body: JSON.stringify(payload), }).then((response) => response.json()); // 1. Quote. Nothing is spent. const quote = await post({ quote_only: true, ...input }); console.log(quote.data.credits); // 2. Run. const job = await post({ quote_id: quote.data.quote_id, ...input }); // 3. Poll, then read the result. let status = "queued"; while (status !== "completed" && status !== "failed" && status !== "canceled") { await new Promise((done) => setTimeout(done, 3000)); const poll = await fetch(`${url.split("/v1")[0]}/v1/jobs/${job.data.id}/status`, { headers: { Authorization: `Bearer ${key}` }, }).then((response) => response.json()); status = poll.data.status; } const result = await fetch(`${url.split("/v1")[0]}/v1/jobs/${job.data.id}/result`, { headers: { Authorization: `Bearer ${key}` }, }).then((response) => response.json()); console.log(result.data.result); ``` ```python import os, time, requests key = os.environ["ROASOS_API_KEY"] url = "https://api.roasos.com/v1/video/gemini-omni-flash" headers = { "Authorization": f"Bearer {key}", "Idempotency-Key": "0f1c9e2a-gemini-omni-flash-0001", } payload = { "prompt": "A woman holds the bottle at eye level in a bright kitchen, morning light, static camera." } # 1. Quote. Nothing is spent. quote = requests.post(url, headers=headers, json={"quote_only": True, **payload}).json() print(quote["data"]["credits"]) # 2. Run. job = requests.post(url, headers=headers, json={"quote_id": quote["data"]["quote_id"], **payload}).json() job_id = job["data"]["id"] # 3. Poll, then read the result. jobs = "https://api.roasos.com/v1/jobs" status = "queued" while status not in ("completed", "failed", "canceled"): time.sleep(3) status = requests.get(f"{jobs}/{job_id}/status", headers=headers).json()["data"]["status"] result = requests.get(f"{jobs}/{job_id}/result", headers=headers).json() print(result["data"]["result"]) ``` ## 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](https://docs.roasos.com/models/video/gemini-omni-flash/llms.txt) — 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](/api-reference/overview). * [Jobs](/concepts/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`.