promptstringrequired
The text prompt describing the video you want to generate.
Flux 3 Text to Video
bfl/flux-3/text-to-videoFlux 3 by BFL - generate cinematic videos from text descriptions with AI. Create high-quality video content with natural motion, camera control, and optional audio generation.
Try the model
Playground
Input
The text prompt describing the video you want to generate.
Additional Settings More
Customize your input with more control.
Output aspect ratio. Allowed values: 21:9, 2:1, 16:9, 4:3, 1:1, 3:4, 9:16.
Resolution of the generated video. Allowed values: 720p, 1080p.
Video duration in seconds (5-20). Allowed values: 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20.
Whether to generate audio for the video.
ResultExample
What would you like to do next?
Examples
Select an example to load its inputs and result into the playground.
- Open result ↗
Input
{ "prompt": "a red panda walking along a mossy log" }
Flux 3 Text to Video
FLUX 3 text-to-video: 5–20 second clips with optional native audio at 720p or 1080p.
Fields
| Field | Type | Default | Notes |
|---|---|---|---|
prompt | string, required | — | Text instruction. |
aspect_ratio | 21:9 / 2:1 / 16:9 / 4:3 / 1:1 / 3:4 / 9:16 | 16:9 | Output frame shape. |
resolution | 720p / 1080p | 720p | Sets the per-second rate. |
duration | 5–20 | 5 | Output length in seconds. |
generate_audio | boolean | true | Native audio. Same price on or off. |
Billing
You pay for output seconds: $0.17 at 720p and $0.29 at 1080p.
| Output | 720p | 1080p |
|---|---|---|
| 5s (default) | $0.85 | $1.45 |
| 10s | $1.70 | $2.90 |
| 20s | $3.40 | $5.80 |
Failed runs are not charged.
Prompting
- Describe subject, action, camera, and sound.
Limits
- Clips are 5–20 seconds.
Also on SandBase
Other FLUX 3 endpoints: bfl/flux-3/text-to-image, bfl/flux-3/edit, bfl/flux-3/image-to-video.
Start building
Send your first request
Submit this model through the SandBase Unified Run API.
# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
-X POST "https://api.sandbase.ai/v1/run" \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
-H "Content-Type: application/json" \
--data-binary @- <<'SANDBASE_JSON'
{
"model": "bfl/flux-3/text-to-video",
"prompt": "A red panda walks along a mossy log in a sunlit forest, one continuous unbroken shot. Ambient birdsong and rustling leaves.",
"duration": 5,
"resolution": "720p",
"aspect_ratio": "16:9",
"generate_audio": true
}
SANDBASE_JSON
)
run_id=$(printf '%s' "$result" | jq -r .id)
for attempt in $(seq 1 120); do
status=$(printf '%s' "$result" | jq -r .status)
case "$status" in completed|failed|timeout) break ;; esac
sleep 2
result=$(curl --fail-with-body --silent \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
"https://api.sandbase.ai/v1/run/$run_id")
done
status=$(printf '%s' "$result" | jq -r .status)
[ "$status" = completed ] || { echo "Generation ended: $status" >&2; exit 1; }
printf '%s\n' "$result"2. Authentication
Create a SandBase API key and set it in your server environment. All requests use Bearer authentication.
export SANDBASE_API_KEY="YOUR_API_KEY"Keep the key on your server. Do not expose it in browser code or commit it to a repository.
3. Queue
Submit a request
POST to /v1/run with this model ID and its inputs. The request example above includes submission and polling.
Fetch request status and result
Use the returned run ID to poll until the status is completed, failed or timeout. Read output only after completed.
curl "https://api.sandbase.ai/v1/run/$RUN_ID" \
-H "Authorization: Bearer $SANDBASE_API_KEY"4. Files
Hosted files
Pass a publicly accessible file URL in the model’s image, video or audio field. Supported formats and limits are shown beside each Playground input.
Uploading images
Use the upload or replace control on supported image fields in the Playground. Video URL fields accept a hosted driving video; they do not imply video-upload support.
5. Schema
Input
durationinteger
Video duration in seconds (5-20).
Default: 5
Possible values: 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20
resolutionstring
Resolution of the generated video.
Default: "720p"
Possible values: "720p", "1080p"
aspect_ratiostring
Output aspect ratio.
Default: "16:9"
Possible values: "21:9", "2:1", "16:9", "4:3", "1:1", "3:4", "9:16"
generate_audioboolean
Whether to generate audio for the video.
Default: true
{
"model": "bfl/flux-3/text-to-video",
"prompt": "A red panda walks along a mossy log in a sunlit forest, one continuous unbroken shot. Ambient birdsong and rustling leaves.",
"duration": 5,
"resolution": "720p",
"aspect_ratio": "16:9",
"generate_audio": true
}Output
A completed run exposes its result in output. The following is the model’s saved example, not a new generation.
[
{
"poster": "https://static.sandbase.ai/examples/posters/9e5d080aa43b7eab4c45.jpg",
"source": "Completed user prediction (visual safety screened)",
"source_url": "https://www.sandbase.ai",
"url": "https://static.sandbase.ai/examples/722372c8-5a4e-4d41-9f81-0667138088a9/output/d25eb1eb-c0ff-4836-9abc-cdadd16a7d15.mp4"
}
]