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FLUX 3 First–Last

Interpolate start and end frames with FLUX.3 native audio, 5–20s Generate on this page, then continue in TheFluxTrain studios when you need a full workflow.

Quick answer: FLUX 3 First–Last is an AI start and end frame video model on TheFluxTrain. Open this page, add the required inputs, and generate with credits after you sign in.

How to use

  1. Open the FLUX 3 First–Last page on TheFluxTrain.
  2. Write a clear prompt describing the result you want.
  3. Upload or attach a reference image.
  4. Add an end-frame image if you want a start-to-end transition.
  5. Pick an aspect ratio that matches your crop (for example 16:9 or 1:1).
  6. Choose an output resolution.
  7. Set the clip duration.
  8. Toggle generated audio on or off if the model supports it.
  9. Click Generate. Sign in if you are not already logged in — credits are used only when generation starts.
  10. Preview the result on this page, then reuse it in other TheFluxTrain studios if needed.

Capabilities

  • Interpolate motion between a start frame and an end frame
  • Control the transition with a prompt
  • Produce short clips with optional generated audio

You can draft prompts on this page before signing in. Uploaded media and generation requests are sent only when you start a run, and credits are charged for successful generation jobs.

Frequently asked questions

Interpolate start and end frames with FLUX.3 native audio, 5–20s
You can open the page and draft a prompt without signing in. TheFluxTrain asks you to sign in when you generate, and uses credits for the run.
Yes. Exploring the page is free. Starting a generation spends credits based on the model and settings you choose. The page shows an estimate before you run.
After you try it here, the same model is available in TheFluxTrain at /video/image-interpolation, and in Flow Studio where that node family is supported.
This page accepts a text prompt, an image, an end-frame image. You can also set aspect ratio, resolution, duration, generate audio when those controls are available.
Yes. Download or reuse the generated clip in TheFluxTrain video editor, Flow Studio, or export it for your own timeline.
FLUX 3 First–Last is marked Premium on TheFluxTrain. Premium models typically cost more credits per run than standard models.
1083 Credits