FLUX 3 (Extend Video)

Node type: video:flux_3_extend
Category: video
Hidden in sidebar: yes (auto-selected by routing)

Description

FLUX 3 video continuation via Black Forest Labs. Routing target for the FLUX 3 node when a clip is wired into Video to Extend; not independently browsable. Billed on BFL’s continuation rate table, which is higher than text- or image-to-video.

Pricing

• Cost: ~86 credits per second
• Notes: Source: docs.bfl.ml pricing, checked 2026-08-05 — the VIDEO CONTINUATION line, which is a different rate table from t2v/i2v. Continuation: $0.43/s at hd, $0.54/s at fhd. Draft: $0.12/s at ANY resolution (pricing.rateOverrides, because it replaces the per-second rate rather than shifting the resolution tier). RAW costs, so marginMultiplier is intentionally undefined and the progressive margin applies. Re-verify against the first BFL invoice.

Variant family

• Family: flux-3-video
• Is primary: no
• All variants: video:flux_3, video:flux_3_i2v, video:flux_3_extend

Canvas ports

These appear as port handles on the left side of the node.

ID	Label	Details
prompt	Prompt	TEXT (required) · multiline
image1	Start Image	IMAGE — Wire an image to animate it (image-to-video). Leave empty for text-to-video. Add an End Frame for a start-to-end pair, or extra Keyframes for a storyboard.
image2	Keyframe 2	IMAGE — Optional extra keyframe. With 3 or more images wired (End Frame included), FLUX 3 runs as a storyboard and the keyframes are spread EVENLY across the chosen Duration: the first sits at 0s, the last at the end, the rest at equal intervals. Two images means first frame and last frame.
image3	Keyframe 3	IMAGE — Optional extra keyframe. With 3 or more images wired (End Frame included), FLUX 3 runs as a storyboard and the keyframes are spread EVENLY across the chosen Duration: the first sits at 0s, the last at the end, the rest at equal intervals. Two images means first frame and last frame.
image4	Keyframe 4	IMAGE — Optional extra keyframe. With 3 or more images wired (End Frame included), FLUX 3 runs as a storyboard and the keyframes are spread EVENLY across the chosen Duration: the first sits at 0s, the last at the end, the rest at equal intervals. Two images means first frame and last frame.
image5	Keyframe 5	IMAGE — Optional extra keyframe. With 3 or more images wired (End Frame included), FLUX 3 runs as a storyboard and the keyframes are spread EVENLY across the chosen Duration: the first sits at 0s, the last at the end, the rest at equal intervals. Two images means first frame and last frame.
end_image_url	End Frame	IMAGE — Optional last frame. With a Start Image wired, FLUX 3 interpolates from the start image to this one. Always counts as the LAST keyframe. Wiring it with no Start Image is refused before you are charged, because a single keyframe is read as the OPENING frame.
video_url	Video to Extend	VIDEO — Wire a clip to continue it: FLUX 3 picks up from its final frames and carries the motion and framing forward with no cut. Video continuation is billed at a HIGHER rate than text- or image-to-video. Cannot be combined with keyframe images — that combination is refused before you are charged.

Sidebar config

These render as form fields in the right-side config panel when the node is selected.

ID	Label	Details
aspect_ratio	Aspect Ratio	TEXT · options: auto, 21:9, 2:1, 16:9, 4:3, +3
duration	Duration (seconds)	TEXT · options: 5, 6, 7, 8, 9, +11
resolution	Resolution	TEXT · options: hd, fhd
draft	Draft (fast preview)	BOOLEAN — Much faster and much cheaper (6 credits/second at any resolution), at lower quality. Use it to iterate on the prompt, then turn it off for the final render.
generate_audio	Generate Audio	BOOLEAN

Outputs

ID	Label	Type
video	Generated Video	VIDEO

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Auto-generated from the Wireflow node registry.