FLUX 3 Max Text to Video API

blackforestlabs/flux-3-max/text-to-video

720p / 1080p · 5–20 sec

FLUX 3 Max Text to Video turns a written shot into a 5–20 second 720p or 1080p video with native audio and eight aspect ratios. It follows the camera moves, lighting and sound cues you describe, so one prompt returns picture and audio together.

Input

Prompt480

Duration

Resolution

Aspect Ratio

Sound

OutputExample

Continue with

FLUX 3 Max Image to Video FLUX 3 Max Keyframes to Video FLUX 3 Text to Video

REST API

Quick Start

Make your first FLUX 3 Max Text to Video request in three steps. The example asks for an 8-second 16:9 shot with sound and returns a task_id.

Connect to the Vidgo API

Create an API key, keep it on your server, and send it in the Authorization header as a Bearer token.

Endpoint: POSThttps://api.vidgo.ai/api/generate/submit
Authentication: Authorization: Bearer VIDGO_API_KEY

Submit one generation task

Run the short example with a prompt. Every other field has a default.

Submit request

curl --request POST \
  --url "https://api.vidgo.ai/api/generate/submit" \
  --header "Authorization: Bearer $VIDGO_API_KEY" \
  --header "Content-Type: application/json" \
  --data '{
  "model": "blackforestlabs/flux-3-max/text-to-video",
  "input": {
    "prompt": "One continuous 8-second shot at dawn on a wind-swept salt flat. A lone kite surfer in a rust-orange wetsuit carves a wide arc across a thin sheet of mirror-still water, spray fanning out behind the board. Camera: low tracking shot that starts beside the board and slowly rises to reveal the pale pink horizon. Lighting: soft low sun, long reflections, gentle haze. Native audio: steady wind, the hiss of the board on water, a single gull far away. No text, no logos, no watermark.",
    "duration": 8,
    "resolution": "720p",
    "aspect_ratio": "16:9",
    "sound": true
  }
}'

Wait for the result

Use the returned task_id to check the same task until it reaches finished or failed. On success, read data.files[].file_url.

Track status

GET https://api.vidgo.ai/api/generate/status/{task_id}

Poll every few seconds while the status is not_started or running, and stop on finished or failed. On success, read data.files[].file_url. For longer clips, lengthen the interval gradually or add callback_url to the submit request.

not_startedrunningfinishedfailed

Submit response

{
  "code": 200,
  "data": {
    "task_id": "1WS6SQGB9KFNYIOX",
    "status": "not_started",
    "created_time": "2026-11-05T07:04:44"
  }
}

Finished response

{
  "code": 200,
  "data": {
    "task_id": "1WS6SQGB9KFNYIOX",
    "status": "finished",
    "files": [
      {
        "file_url": "https://cdn.vidgo.ai/apis/models/blackforestlabs/flux-3-max/text-to-video/v2/01/output-01.mp4",
        "file_type": "video"
      }
    ],
    "created_time": "2026-11-05T07:04:44",
    "error_message": null,
    "progress": 100
  }
}

Complete runnable example

Open this after the three-step flow is clear. It combines submission, polling, terminal-state handling and result extraction in one script.

Complete runnable example

set -euo pipefail
: "${VIDGO_API_KEY:?Set VIDGO_API_KEY in your environment}"

REQUEST_BODY=$(cat <<'JSON'
{
  "model": "blackforestlabs/flux-3-max/text-to-video",
  "input": {
    "prompt": "One continuous 8-second shot at dawn on a wind-swept salt flat. A lone kite surfer in a rust-orange wetsuit carves a wide arc across a thin sheet of mirror-still water, spray fanning out behind the board. Camera: low tracking shot that starts beside the board and slowly rises to reveal the pale pink horizon. Lighting: soft low sun, long reflections, gentle haze. Native audio: steady wind, the hiss of the board on water, a single gull far away. No text, no logos, no watermark.",
    "duration": 8,
    "resolution": "720p",
    "aspect_ratio": "16:9",
    "sound": true
  }
}
JSON
)

SUBMIT_RESPONSE=$(curl --silent --show-error --fail-with-body \
  --request POST \
  --url "https://api.vidgo.ai/api/generate/submit" \
  --header "Authorization: Bearer $VIDGO_API_KEY" \
  --header "Content-Type: application/json" \
  --data "$REQUEST_BODY")

TASK_ID=$(printf '%s' "$SUBMIT_RESPONSE" | jq -r '.data.task_id // .task_id // empty')
if [ -z "$TASK_ID" ]; then
  printf 'Submit response did not include task_id:
%s
' "$SUBMIT_RESPONSE" >&2
  exit 1
fi

while true; do
  STATUS_RESPONSE=$(curl --silent --show-error --fail-with-body \
    --url "https://api.vidgo.ai/api/generate/status/$TASK_ID" \
    --header "Authorization: Bearer $VIDGO_API_KEY")
  STATUS=$(printf '%s' "$STATUS_RESPONSE" | jq -r '.data.status // .status // empty')

  case "$STATUS" in
    finished)
      printf '%s' "$STATUS_RESPONSE" | jq -r '(.data.files // .files // [])[]?.file_url'
      break
      ;;
    failed)
      printf '%s' "$STATUS_RESPONSE" | jq -r '.data.error_message // .error_message // "Generation failed"' >&2
      exit 1
      ;;
    not_started|running)
      sleep 2
      ;;
    *)
      printf 'Unexpected task status: %s
' "$STATUS" >&2
      exit 1
      ;;
  esac
done

Request Parameters

model and callback_url belong at the request root; generation parameters belong inside input.

Field	Type	Required	Default	Description
model	string	Yes	—	Fixed to blackforestlabs/flux-3-max/text-to-video.
callback_url	string (URL)	No	—	A public HTTP(S) URL that receives the task result when it finishes.
input	object	Yes	—	Generation parameters: a prompt plus optional duration, resolution, aspect_ratio and sound.
input.prompt	string	Yes	—	Text prompt for the shot, including audio cues when sound is on.
input.duration	integer	No	5	Whole seconds, 5–20.
input.resolution	string	No	720p	720p or 1080p.
input.aspect_ratio	string	No	auto	auto, 21:9, 2:1, 16:9, 4:3, 1:1, 3:4, 9:16.
input.sound	boolean	No	true	Native audio on or off; does not change the price.

Response Fields

Submission returns the task identity immediately. Status responses add progress, output files or a failure message as the task advances.

Field	Type	Description
code	integer	Application result code. Successful responses use 0 or 200.
message	string	Human-readable response or error message when present.
data.task_id	string	Task identifier used in the status endpoint path.
data.status	string	Current state: not_started, running, finished or failed.
data.created_time	string	Task creation time in date-time format.
data.progress	number	Completion percentage when the provider reports progress.
data.files[]	array	Generated output files returned after a successful task.
data.files[].file_url	string	Public URL of the generated video.
data.files[].file_type	string	Generated file type, such as video.
data.files[].watermark_url	string \| null	Watermarked output URL when one is available.
data.error_message	string \| null	Failure detail when status is failed.

Task Lifecycle

Treat not_started and running as non-terminal states. finished and failed are terminal; stop polling when either is returned.

not_started
The task has been accepted and is queued to start.
running
The video is being generated. Keep polling the status endpoint.
finished
The task is complete. Read the video URL from data.files[].file_url.
failed
Generation failed. Read data.error_message for details and stop polling.

Polling and Errors

Authentication401 means the Bearer API key is missing or invalid. Check your key in the dashboard before retrying.
Validation400 means a request field is invalid or belongs to another endpoint. Check prompt, duration and aspect_ratio.
Polling intervalPoll every few seconds while the task runs, and lengthen the interval gradually for longer clips.
Terminal statesPoll only while the status is not_started or running. Stop on finished or failed.
Callback optionAdd callback_url at the request root to receive the final result without continuous polling.

Model Specifications

Specification	Value	Description
Model	blackforestlabs/flux-3-max/text-to-video	Model identifier for asynchronous text-to-video generation.
Duration	5–20	Whole seconds; defaults to 5.
Resolution	720p \| 1080p	Defaults to 720p.
Aspect ratio	auto \| 21:9 \| 2:1 \| 16:9 \| 4:3 \| 1:1 \| 3:4 \| 9:16	Defaults to auto.
Pricing	34 / 58 credits/s	720p / 1080p, per output second; audio is included.

View the FLUX 3 Max Text to Video API documentation

FLUX 3 Max Text to Video

FLUX 3 Max is a video model post-trained by fal in collaboration with Black Forest Labs on top of the FLUX 3 video base, released in October 2026. Text to Video builds the whole clip from a prompt: subject, motion, camera path, lighting and an audio track generated in the same pass. Clips run 5–20 seconds at 720p or 1080p, which suits concept shots, social formats and pitch films that need sound from the first draft.

Why choose the FLUX 3 Max Text to Video API?

Picture and sound in one requestAudio is generated with the video by default, so ambience, effects and short dialogue described in the prompt arrive in the same file.
Up to 20 seconds per clipChoose any whole-second length from 5 to 20, enough for a full camera move or a short scene without stitching.
Eight framing optionsWide 21:9 and 2:1 for cinematic shots, 16:9 and 4:3 for screens, 1:1, 3:4 and 9:16 for feeds and mobile.
Two resolutions, one simple rate720p at 34 credits per second for drafts, 1080p at 58 credits per second for delivery. Audio adds nothing.

Parameters

Parameter	Requirement	Description
prompt	Required	Describe the subject, action, camera movement, lighting and the sound you want. Leading and trailing spaces are trimmed; the text must not be empty. Default`—`
duration	Optional	Output length in whole seconds, from 5 to 20. Default`5`
resolution	Optional	720p or 1080p. The resolution sets the per-second rate. Default`720p`
aspect_ratio	Optional	auto, 21:9, 2:1, 16:9, 4:3, 1:1, 3:4 or 9:16. auto renders 16:9. Default`auto`
sound	Optional	Generate a native audio track in the same pass. Set false for silent footage; the price stays the same. Default`true`

How to Use

Write the shotDescribe the subject, action, camera path and lighting in one or two sentences, then add the sounds you expect to hear.
Pick length and frameSet duration from 5 to 20 seconds and choose an aspect ratio; auto renders 16:9.
Choose resolution and soundDraft at 720p and switch to 1080p for the final take. Keep sound on, or set it to false for silent footage.
Submit and collect the videoSend the request, keep the task_id, and poll the status endpoint or use callback_url until data.files[].file_url is returned.

Usage and billing

FLUX 3 Max Text to Video is billed per output second at the selected resolution. Sound is included at no extra cost.

Usage	Rate	Details
720p	34 credits / second	$0.17 / second. A 5-second clip costs 170 credits ($0.85); 20 seconds costs 680 credits ($3.40).
1080p	58 credits / second	$0.29 / second. A 10-second clip costs 580 credits ($2.90); 20 seconds costs 1,160 credits ($5.80).

Best Use Cases

Concept and pitch shotsTurn a written idea into a 21:9 clip with matching ambience for a treatment or client pitch.
Vertical social clipsGenerate 9:16 shorts with sound already in place, ready for review in a feed preview.
Atmosphere and B-rollProduce landscapes, city scenes or weather shots with natural sound for edits and backgrounds.
Fast draft-to-final passesIterate on wording at 720p, then rerun the approved prompt at 1080p.

Pro Tips

Describe one continuous action per clip and name the camera move, such as a slow dolly or low tracking shot.
Write sounds as concrete events: wind across water, a door closing, one short line of dialogue in quotes.
For longer durations, describe how the shot develops over time so the extra seconds carry new motion.
Set aspect_ratio explicitly when the delivery format is fixed; auto always renders 16:9 in this mode.

Notes

Send prompt, duration, resolution, aspect_ratio and sound inside input; image or keyframe fields belong to the sibling endpoints.
Credits are duration × the resolution rate and are reserved when the task is submitted.
A successful submission returns a task_id; poll the status endpoint or set callback_url to receive the result.

Related Models

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Gemini Omni 1.1 Flash Reference-to-Video preview

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Gemini Omni 1.1 Flash Video Edit preview

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MiniMax H3 Max Turbo Text to Video preview

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FLUX 3 Max Text to Video API FAQ

What is the FLUX 3 Max Text to Video API?

FLUX 3 Max Text to Video is a video model post-trained by fal in collaboration with Black Forest Labs for generating video from text. It turns a prompt into a 5–20 second clip at 720p or 1080p with native audio and eight aspect ratios. Built on the FLUX 3 video base, it keeps the subject, camera path and lighting you describe while adding motion and a matching sound track in the same pass. You can call it programmatically or try it from the playground above.

How does FLUX 3 Max Text to Video handle sound?

Sound is on by default: the model generates an audio track together with the picture, guided by the sounds you describe in the prompt. Set sound to false when you need silent footage for your own score; the price is the same either way.

How long can a FLUX 3 Max Text to Video clip be?

Set duration to any whole number from 5 to 20 seconds; the default is 5. Longer clips work best when the prompt describes how the action or camera develops over time.

How much does FLUX 3 Max Text to Video cost per second?

720p costs 34 credits ($0.17) per output second and 1080p costs 58 credits ($0.29). An 8-second 720p clip is 272 credits; audio does not change the price.

Which aspect ratio does FLUX 3 Max Text to Video use with auto?

With no image to follow, auto renders 16:9. Choose 21:9, 2:1, 4:3, 1:1, 3:4 or 9:16 explicitly when the destination format is fixed.

Should I draft FLUX 3 Max Text to Video at 720p or 1080p?

Iterate on prompt wording at 720p, which costs about 40% less per second, then rerun the approved prompt at 1080p for delivery. Both resolutions accept the same fields.

How is FLUX 3 Max Text to Video different from FLUX 3 Text to Video?

FLUX 3 Max is the post-trained tier of the FLUX 3 video model, tuned by fal for prompt adherence and render speed, and it is billed at the same per-second rates. The FLUX 3 family on Vidgo also offers extend-video and first-last-frame endpoints if your workflow needs them.