Video

FLUX.3 First + Last Frame

Credit-based pricing. Supports image-to-video, audio generation.

Try FLUX.3 First + Last Frame →Compare models

Output

video

Aspect ratio

auto, 21:9, 2:1, 16:9, 4:3, 1:1, 3:4, 9:16

Resolution

720p, 1080p

Duration

5s, 6s, 7s, 8s, 9s, 10s, 11s, 12s, 13s, 14s, 15s, 16s, 17s, 18s, 19s, 20s

Inputs

Start image (required)

Generates audio

Example prompt

A continuous cinematic move connects the opening composition to the closing frame, natural physical motion, consistent subject identity and lighting

Try this prompt →

LLM-ready

API & LLM schema

Exact request contract for this model. Agents can fetch it from /api/v1/models?id=blackforestlabs/flux-3/first-last-frame-to-video.

POST/api/v1/generate14 fields · 4 required

Field	Type	Requirement	Contract
`model_id`	constant	Required	ArtEmotion model identifier.
`extra`	object	Optional	Model-specific settings may also be nested here.
`max_credits`	number	Optional	Reject before submission if the estimated list price exceeds this cap. · Range: 1–…
`webhook_url`	string	Optional	Format: uri
`webhook_secret`	string	Optional	Optional model input.
`folder_id`	string	Optional	Optional model input.
`prompt`	string	Required	Optional model input.
`start_image_url`	string	Required	Format: uri
`end_image_url`	string	Required	Format: uri
`generate_audio`	boolean	Optional	Generate synchronized dialogue, ambience, and sound effects with the video. · Default: true
`aspect_ratio`	string	Optional	Allowed: auto, 21:9, 2:1, 16:9, 4:3, 1:1, 3:4, 9:16
`resolution`	string	Optional	Allowed: 720p, 1080p
`safety_tolerance`	number	Optional	Provider safety level. 0 is strictest; ArtEmotion keeps the provider default of 2. · Allowed: 0, 1, 2, 3, 4 · Default: 2
`duration`	number	Optional	Allowed: 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20

Minimal request example

{
  "model_id": "blackforestlabs/flux-3/first-last-frame-to-video",
  "prompt": "A continuous cinematic move connects the opening composition to the closing frame, natural physical motion, consistent subject identity and lighting",
  "start_image_url": "https://example.com/start_image",
  "end_image_url": "https://example.com/end_image"
}

Raw JSON Schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://www.artemotion.ai/api/v1/models?id=blackforestlabs%2Fflux-3%2Ffirst-last-frame-to-video",
  "title": "FLUX.3 First + Last Frame generation request",
  "description": "Request body accepted by POST /api/v1/generate for blackforestlabs/flux-3/first-last-frame-to-video.",
  "type": "object",
  "properties": {
    "model_id": {
      "type": "string",
      "const": "blackforestlabs/flux-3/first-last-frame-to-video",
      "description": "ArtEmotion model identifier."
    },
    "extra": {
      "type": "object",
      "additionalProperties": true,
      "description": "Model-specific settings may also be nested here."
    },
    "max_credits": {
      "type": "number",
      "minimum": 1,
      "description": "Reject before submission if the estimated list price exceeds this cap."
    },
    "webhook_url": {
      "type": "string",
      "format": "uri",
      "maxLength": 2048
    },
    "webhook_secret": {
      "type": "string",
      "maxLength": 512
    },
    "folder_id": {
      "type": "string"
    },
    "prompt": {
      "type": "string"
    },
    "start_image_url": {
      "type": "string",
      "format": "uri"
    },
    "end_image_url": {
      "type": "string",
      "format": "uri"
    },
    "generate_audio": {
      "title": "Generate audio",
      "description": "Generate synchronized dialogue, ambience, and sound effects with the video.",
      "default": true,
      "type": "boolean"
    },
    "aspect_ratio": {
      "type": "string",
      "enum": [
        "auto",
        "21:9",
        "2:1",
        "16:9",
        "4:3",
        "1:1",
        "3:4",
        "9:16"
      ]
    },
    "resolution": {
      "type": "string",
      "enum": [
        "720p",
        "1080p"
      ]
    },
    "safety_tolerance": {
      "title": "Safety tolerance",
      "description": "Provider safety level. 0 is strictest; ArtEmotion keeps the provider default of 2.",
      "default": 2,
      "type": "number",
      "enum": [
        0,
        1,
        2,
        3,
        4
      ]
    },
    "duration": {
      "type": "number",
      "enum": [
        5,
        6,
        7,
        8,
        9,
        10,
        11,
        12,
        13,
        14,
        15,
        16,
        17,
        18,
        19,
        20
      ]
    }
  },
  "required": [
    "model_id",
    "prompt",
    "start_image_url",
    "end_image_url"
  ],
  "additionalProperties": false
}

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FAQ

How much does FLUX.3 First + Last Frame cost on ArtEmotion?

Credit-based pricing. You pay in ArtEmotion credits — every plan and top-up converts USD to credits at a fixed rate.

Do I get my credits back if FLUX.3 First + Last Frame fails?

Yes — failed generations are never charged. The credits are released back to your balance automatically.

Can I call FLUX.3 First + Last Frame from the API?

Yes. Use POST /api/v1/generate with model_id: "blackforestlabs/flux-3/first-last-frame-to-video". See the API reference for the full schema.

Where are my generations stored?

Every output is saved to your personal Library. You can export or delete everything any time from Privacy & deletion.

Ready to generate with FLUX.3 First + Last Frame?

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No commitment. New accounts get 50 free credits on signup. See pricing.