calesthio Gemini Omni Flash (Google DeepMind)
Gemini Omni is Google DeepMind's video generation and editing model family, announced at I/O 2026. The first model, Gemini Omni Flash (gemini-omni-flash-preview, developer access since June 30, 2026), generates 3-10 second clips at 720p/24fps with synthesized audio via the Gemini Interactions API. Its differentiator in the OpenMontage fleet is stateful conversational editing: each generation returns an interaction_id, and a follow-up call with previous_interaction_id edits that video in place — no other wrapped provider can refine a clip without regenerating it.
OpenMontage wraps it as gemini_omni_video (native Gemini API, no gateway). It shares GOOGLE_API_KEY/GEMINI_API_KEY with google_imagen and google_tts — one key, three capabilities. Paid tier only: ~$0.10 per second of output video (billed as 5,792 output tokens/sec at $17.50/1M).
Other documented routes are available when the direct Google key is not the chosen provider:
| Route | OpenMontage call | Important limitation |
|---|---|---|
| fal.ai | gemini_omni_fal |
T2V, I2V, reference video, and edit endpoints; no Google interaction ID is returned |
| Runway | runway_video, model: "gemini_omni_flash" |
T2V/I2V/V2V; video edits accept up to five image references |
| ComfyUI Partner Node | comfyui_video, model_family: "gemini_omni_flash" |
Hosted paid node; requires network, Comfy login, and credits |
Use the direct gemini_omni_video route for stateful conversational editing.
Gateway routes return ordinary provider tasks and cannot preserve Google's
previous_interaction_id workflow. The fal edit endpoint can still be iterated
by feeding each output video URL into the next edit call.
When to pick it (and when not)
| Use it for | Prefer another provider for |
|---|---|
| Iterative refinement — generate, review, then edit the same clip in layers | One-shot cinematic hero clips (→ Seedance 2.0, see seedance-2-0) |
| Editing an existing/uploaded clip (restyle, add/remove objects, change text) | Clips longer than 10s or above 720p |
| On-screen rendered text and word-by-word text beats | Seed-reproducible generations (no seed support) |
| Reference-image-bound subjects/styles via prompt tags | First/last-frame interpolation (→ veo_video) |
| Timecode-scheduled multi-beat clips from one prompt | Non-English narration (English only fully supported) |
Route through video_selector for generation operations. Editing (edit_video) is a direct-tool operation — call gemini_omni_video from the registry, because the multi-turn interaction state lives outside the selector's model.
Generation prompting
Describe scene + camera + lighting + motion + audio. Official example:
Continuous, unbroken handheld shot of a fluffy tabby cat sitting on a sunny windowsill, looking out into a leafy garden. The cat's tail twitches slowly, and its ears rotate slightly toward ambient noises. Sunbeams illuminate dust motes in the air.
- Force a single shot explicitly: "In a single continuous shot," / "No scene cuts." Otherwise the model may cut between scenes.
- Negatives go in prose — there is no
negative_promptparameter: "No dialogue," "No extra sound effects." - No sampler controls: system instructions, temperature, top_p, and seeds are all unsupported. The prompt is the only lever.
- Meta-prompt for quality: "Consider micro-detail, expression and timing to create a very rich, detailed but entirely natural scene."
Timecode syntax
Schedule beats with bracketed ranges or natural language — this maps directly onto OpenMontage scene-plan timings:
[0-3s] A person is walking [3-6s] They stop and turn around
"After 3 seconds, a woman enters the scene." / "At 5s the chorus starts in the background audio."
Audio and on-screen text
Audio is synthesized automatically; direct it in the prompt: "Include calm background music," "The audio is a low tinny radio broadcast in the background." Rendered text works and can be timed:
One word on the screen at a time: 'did, you, know, that, Omni, can, do, awesome, text?' Each word appears for 1s.
Reference images (<FIRST_FRAME> / <IMAGE_REF_N> tags)
Pass local images via reference_image_paths (they are sent in order), then bind them to roles inside the prompt with tags. <IMAGE_REF_N> indexes from 0 in the order supplied:
in the style of <IMAGE_REF_0> a woman <IMAGE_REF_1> is walking
[0-3s] A studio fashion sequence. Starting with woman <IMAGE_REF_0>, she is
holding <IMAGE_REF_1> [3-6s] Then we see the man <IMAGE_REF_2> holding <IMAGE_REF_3>
<FIRST_FRAME>makes an image the opening frame:<FIRST_FRAME> a woman is walking.- Use high-resolution images; describe the intended motion specifically rather than "make it move."
- Say what each image is (product / character / style / background reference) — the model decides usage from context.
Conversational editing (the differentiator)
Editing prompts are the opposite of generation prompts: short and surgical. Overly descriptive edit prompts cause unintended changes.
- Generate the base clip (subject + scene + motion). The tool returns
interaction_idin its result data. - Pass it back as
previous_interaction_idwithoperation="edit_video"and describe only the delta. - Append "Keep everything else the same." to pin unmentioned elements.
- Refine in layers — one turn for lighting, one for camera, one for action, one for audio.
Official good/bad pairs:
| Avoid | Instead |
|---|---|
| "In the video of the man sitting on the sofa, please add a small black cat..." | "Add a cat that jumps onto his lap, he begins to pet it. Keep everything else the same." |
| "Please remove the cell phone... and fill in the background so it looks like..." | "Make the phone invisible. Keep everything else the same." |
Other working edit prompts: "Make this video anime" / "Put a fashionable hat on this person" / "Change the lighting to be more dramatic" / "Change the text on the sign to say 'Omni Flash'".
Gotcha — store: editing via previous_interaction_id only works if the prior call kept the interaction server-side (store defaults to true in gemini_omni_video). Set store=false only for one-shot generations you will never edit.
Editing uploaded videos: pass input_video_path instead of previous_interaction_id; the tool uploads it via the Files API. Unavailable in the EEA, Switzerland, and the UK (editing generated videos works everywhere).
Hard limitations (preview)
- Output: 3-10s, 720p, 24fps, MP4 with audio; aspect ratio
16:9or9:16. All output carries an invisible SynthID watermark. - No seed, negative prompt, temperature, top_p, or system instructions.
- No video extension or first/last-frame interpolation; no voice editing.
- Audio reference inputs unsupported. Video references ≤3s are accepted by the schema but not processed correctly — don't rely on them.
- Multi-video prompting unsupported; may degrade output.
- English fully supported; other languages untested.
- Images of minors (EEA/CH/UK) and certain recognizable people are blocked for upload/editing.
Sources
- Generation & editing guide: https://ai.google.dev/gemini-api/docs/omni
- Model card: https://ai.google.dev/gemini-api/docs/models/gemini-omni-flash
- Pricing: https://ai.google.dev/gemini-api/docs/pricing
- Announcement: https://blog.google/innovation-and-ai/models-and-research/gemini-models/gemini-omni/