# Kling 4.0 Edit (video-edit)

> Kling 4.0 Edit changes one source video with a text instruction and optional image references and identity elements. It keeps the motion, the cuts and the timing of the source, and it renders at 720p or 1080p. The output is 3 to 30 seconds long.

Status: roasOS API v1.1. Catalog `model-catalog@2026-10-06.v5`, pricing `customer-pricing@2026-11-05.v15`. The endpoint `POST /v1/video-edit/kling-4` is live. `POST /v1/generations` has no `video-edit` type, so this endpoint is the only path to this model.

## Endpoint
POST https://api.roasos.com/v1/video-edit/kling-4
Auth: Authorization: Bearer roasos_sk_… (scope api:write). Idempotency-Key required. quote_only / quote_id / webhook_url as in https://docs.roasos.com/llms.txt.

## Good at
Kling 4.0 Edit is the only Kling edit model since 2026-10-29. It replaced the Kling O3 edit endpoints, and those endpoints are removed.

Use it to replace a person or a product in footage that you own, to change the setting, or to change the look. The source video must be 3 to 30 seconds long and at least 700 px on each side. The prompt names the source as `@Video1`. Send `references` (up to 10 images, named `@Image1..N`) for looks and products. Send `elements` (up to 7, each a frontal image and 1 to 3 more views, named `@Element1..N`) to put an exact person or product into the video. Send `avatar_id` to use a saved person as an element, and `product_id` to add the product's kit images as references.

The output length is `duration_seconds` when you send it. Otherwise it is the length of the source, rounded to a whole second.

## Pricing
Unit: source_second. Pricing key: `kling-4`.

| request | credits |
|---|---|
| `5s_source_720p` | 12 |
| `5s_source_1080p` | 17 |
| `10s_source_720p` | 23 |
| `10s_source_1080p` | 34 |
| `30s_source_720p` | 68 |
| `30s_source_1080p` | 102 |

Credits come from the roasOS pricing table (`MODEL_COSTS`) through the catalog. No other field changes the price.

## Modes
- `edit`
Provider endpoints: `kling/v4/video-to-video/edit`.

## Request fields
| field | type | required | default | rule |
|---|---|---|---|---|
| `avatar_id` | string | no | — | UUID |
| `avatar_outfit` | string | no | — | ≤ 500 characters |
| `duration_seconds` | integer enum | no | — | `3`, `4`, `5`, `6`, `7`, `8`, `9`, `10`, `11`, `12`, `13`, `14`, `15`, `16`, `17`, `18`, `19`, `20`, `21`, `22`, `23`, `24`, `25`, `26`, `27`, `28`, `29`, `30` |
| `elements` | object[] | no | — | 1–7 items; each `{ frontal_image_url, reference_image_urls }` |
| `product_id` | string | no | — | UUID |
| `prompt` | string | yes | — | ≥ 1 character; ≤ 2,500 characters |
| `quote_id` | string | no | — | UUID |
| `quote_only` | boolean | no | `false` | — |
| `references` | string[] | no | — | ≤ 10 items |
| `resolution` | enum | no | `1080p` | `720p`, `1080p` |
| `video_url` | string | yes | — | https URL; ≤ 4,096 characters |
| `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 returns `400 unsupported_option`. Field names are the roasOS role names, one name per role across every family.

## Media
- `avatar_id` — identity; the saved character reference sheet, with a derived portrait only where the model requires a single face or source frame
- `elements` — identity; one frontal image plus more views, per person or object
- `product_id` — product; resolves to the product image list
- `references` — style and appearance references
- `video_url` — the source video

| role | items | max size | content types | duration |
|---|---|---|---|---|
| `references` | ≤ 10 | 10 MB | `image/jpeg`, `image/png`, `image/webp` | — |
| `video_url` | ≤ 1 | 100 MB | `video/mp4` | 3–30 s |

- Refused: `product_images`, `reference_images`, `image_url`, `end_image_url`, `scene_id`, `scene_image`, `video_urls`, `audio_urls`, `audio_url`, `voice_id`. A refused role returns `400 unsupported_option`.
- Every URL must be an immutable object on `https://cdn.roasos.com/…` that your workspace owns; any other URL is `400 reference_media_not_workspace_owned`. Upload with `POST /v1/uploads` (direct POST of the bytes to `put_url`, or a `source_url` import), then use the returned CDN URL.

## Prompt
Limit 2,500 characters.
- Write only the change: "Replace the person with @Element1. Keep the camera, the cuts and the timing of @Video1."
- Use each `@Image` and `@Element` tag once. The platform adds a missing `@Video1` or `@Image` tag at the end. You must write each `@Element` tag yourself.
- Ask for the existing text in the video to stay, unless you want it removed.
- Do not ask for a new shot plan. The source sets the shots.

## Not exposed
- `video_url`: values not exposed — `MOV containers`.
- `video_urls`: not accepted by this public endpoint.
- `voice_ids`: not accepted by this public endpoint.

## Result
Result kind `video`. Always present: `url`.
```json
{ "data": { "id": "gen_…", "kind": "video", "model": "kling-4", "status": "completed", "result": {"url":"https://cdn.roasos.com/workspaces/ws_01/result"} } }
```
Files live on `https://cdn.roasos.com` and are immutable; a result URL can be a media input to the next call. Poll `GET /v1/jobs/{id}/status` → `{ id, status, updated_at }`, then `GET /v1/jobs/{id}/result` (`409 run_not_completed` until the job is `completed`, `failed` or `canceled`). Statuses: `queued → processing → completed | failed | canceled`.

## Example
```bash
# 1. quote — nothing is spent
curl -X POST https://api.roasos.com/v1/video-edit/kling-4 \
  -H "Authorization: Bearer roasos_sk_live_…" \
  -H "Idempotency-Key: 0f1c9e2a-kling-4-0001" \
  -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.","video_url":"https://cdn.roasos.com/workspaces/ws_01/uploads/video_url.mp4"}'
# → 200 { "data": { "kind": "quote", "quote_id": "q_7Hk…", "credits": 12, "expires_at": "…", "confirmation": { "model": "kling-4", "example": "5s_source_720p" } } }

# 2. run — the same body and the same Idempotency-Key, quote_id instead of quote_only
curl -X POST https://api.roasos.com/v1/video-edit/kling-4 \
  -H "Authorization: Bearer roasos_sk_live_…" \
  -H "Idempotency-Key: 0f1c9e2a-kling-4-0001" \
  -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.","video_url":"https://cdn.roasos.com/workspaces/ws_01/uploads/video_url.mp4"}'
# → 201 { "data": { "id": "gen_…", "kind": "video", "model": "kling-4", "status": "queued", "credits_reserved": 12, "links": { "status": "/v1/jobs/gen_…/status", "result": "/v1/jobs/gen_…/result" } } }

# 3. poll
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_…"
```

## Today
Not available on the public API yet. `POST /v1/generations` has no `video-edit` type.

## See also
https://docs.roasos.com/models/video-edit/kling-4 · https://api.roasos.com/v1/catalog/video-edit/kling-4 · kling/v4/video-to-video/edit