# LTX 2.3 Reframe (reframe)

> LTX 2.3 Reframe re-crops a video to another shape and fills the newly exposed areas with generated content that matches the original.

Status: roasOS API v1.1. Catalog `model-catalog@2026-10-06.v5`, pricing `customer-pricing@2026-11-05.v15`. The endpoint `POST /v1/reframe/ltx-2.3` is live. `POST /v1/generations` has no `reframe` type, so this endpoint is the only path to this model.

## Endpoint
POST https://api.roasos.com/v1/reframe/ltx-2.3
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
Take a 16:9 ad to 9:16 without letterboxing it. The model re-frames the shot and paints in what the new edges expose.

The price is billed on the INPUT duration: $0.10 per second at 720p and $0.20 per second at 1080p. A 10-second source costs 12 credits at 720p and 24 at 1080p. The source is capped at 60 seconds, and roasOS measures it before it quotes.

## Pricing
Unit: source_second. Pricing key: `ltx-2.3`.

| request | credits |
|---|---|
| `10s_source_720p` | 12 |
| `30s_source_720p` | 36 |
| `10s_source_1080p` | 24 |
| `30s_source_1080p` | 72 |

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

## Modes
- `reframe`
Provider endpoints: `fal-ai/ltx-2.3/reframe`.

## Request fields
| field | type | required | default | rule |
|---|---|---|---|---|
| `aspect_ratio` | enum | yes | — | `1:1`, `4:5`, `5:4`, `9:16`, `16:9` |
| `quote_id` | string | no | — | UUID |
| `quote_only` | boolean | no | `false` | — |
| `resolution` | enum | yes | — | `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
- `video_url` — the source video

| role | items | max size | content types | duration |
|---|---|---|---|---|
| `video_url` | ≤ 1 | 100 MB | `video/mp4` | 0–60 s |

- Refused: `avatar_id`, `elements`, `product_id`, `product_images`, `references`, `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
None. This model takes no prompt.

`resolution` is required and has no default here, although the provider defaults it to 1080p — at twice the 720p rate. Choose it deliberately: a silent default would be a surprise in one direction or the other.

`resolution` is the OUTPUT tier. It does not change the seconds you are billed for, which are always the seconds of the source.

## Not exposed
- `resolution`: pinned to `required, with no default: fal defaults it to 1080p at twice the rate`.

## Result
Result kind `video`. Always present: `url`.
```json
{ "data": { "id": "gen_…", "kind": "video", "model": "ltx-2.3", "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/reframe/ltx-2.3 \
  -H "Authorization: Bearer roasos_sk_live_…" \
  -H "Idempotency-Key: 0f1c9e2a-ltx-2.3-0001" \
  -H "Content-Type: application/json" \
  -d '{"quote_only":true,"aspect_ratio":"1:1","resolution":"720p","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": "ltx-2.3", "example": "10s_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/reframe/ltx-2.3 \
  -H "Authorization: Bearer roasos_sk_live_…" \
  -H "Idempotency-Key: 0f1c9e2a-ltx-2.3-0001" \
  -H "Content-Type: application/json" \
  -d '{"quote_id":"q_7Hk…","aspect_ratio":"1:1","resolution":"720p","video_url":"https://cdn.roasos.com/workspaces/ws_01/uploads/video_url.mp4"}'
# → 201 { "data": { "id": "gen_…", "kind": "video", "model": "ltx-2.3", "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
The endpoint is `POST /v1/reframe/ltx-2.3`.

It is live.

## See also
https://docs.roasos.com/models/reframe/ltx-2.3 · https://api.roasos.com/v1/catalog/reframe/ltx-2.3 · fal-ai/ltx-2.3/reframe