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MiniMax H3 Fast: First-Last Frame Video on Models and API | RunComfy

minimax/minimax-h3-fast/first-last-frame

MiniMax H3 Fast connects a first frame and a last frame into a short video with audio. It is quicker, with looser prompt following.

Opening frame. JPEG, PNG, or WebP. A URL image may be up to 30 MB.
Closing frame. Same file limits as the opening image.
What should happen in the clip: subject, action, camera, and sound.
Frame shape of the generated video.
Output size. Every listed size uses the same per-second rate.
Length of the generated video, in whole seconds from 5 to 15.
Idle
The rate is $0.02 per second at 480p, 768p, 1080p, and 2k.

Introduction To MiniMax H3 Fast

MiniMax's MiniMax H3 Fast First Last Frame builds a 5-15 second clip with native audio between a start image and an end image, at up to 2K. MiniMax H3 Fast returns sooner and costs less, but it follows detailed prompt instructions less strictly than the standard MiniMax H3 page. For developers, MiniMax H3 Fast on RunComfy can be used both in the browser and via an HTTP API, so you don't need to host or scale the model yourself.
Ideal for: Draft storyboards | Social clips | Fast iteration

Parameters#


MiniMax H3 Fast bills every resolution below at the same rate. Generation is faster than standard MiniMax H3, and detailed prompt instructions are followed less strictly.


ParameterRequiredTypeDefaultRange / OptionsDescription
image*Yes (*)ImageNoneJPEG, PNG, WebP, and similar; URL up to 30 MBOpening frame of the shot.
last_image*Yes (*)ImageNoneSame limits as imageFrame the clip should land on.
prompt*Yes (*)StringExample prompt1 or more charactersDescribe the motion between the two frames, plus camera and sound.
aspect_ratioNoString16:921:9, 16:9, 4:3, 1:1, 3:4, 9:16Output frame shape.
resolutionNoString768p480p, 768p, 1080p, 2kAll four sizes bill at the same per-second rate.
durationNoInteger55-15 secondsLonger clips give the transition more time, and cost more.

  • Required field.

Pricing#


MiniMax H3 Fast is $0.02 per second of generated video at 480p, 768p, 1080p, and 2K. Reference images and a reference video do not add a separate charge on the reference page.


DurationPrice
5 seconds$0.10
10 seconds$0.20
15 seconds$0.30

A batch multiplies that total by the number of outputs.


Related Models

minimax-h3-max/reference-to-video

MiniMax H3 Max Reference to video: multimodal refs to 480p/768p clips

seedance-2.5/text-to-video/4k

Seedance 2.5 4K Text to Video: prompt to 4K cinematic clips

ltx-2.5/text-to-video/pro

LTX 2.5 Pro text-to-video with synced AV in quality mode

kling/lipsync/text-to-video

Create lifelike speech-synced visuals from scripts or clips with Kling Lipsync for precise facial animation and realistic results.

runway-gen-4/turbo/image-to-video

Consistent characters, objects, and scenes in any setting or angle.

hailuo-2-3/fast/standard/image-to-video

Turn static visuals into smooth motion with Hailuo 2.3 for rapid, realistic video creation.

Frequently Asked Questions

What is MiniMax H3 Fast first-and-last-frame video used for?

MiniMax H3 Fast builds a 5-15 second video with native audio between an opening image and a closing image. It is useful for transitions, product reveals, and short story beats when both ends of the shot are already designed.

How well does MiniMax H3 Fast follow a first-and-last-frame prompt?

MiniMax H3 Fast is faster than standard MiniMax H3 and follows detailed instructions less strictly. Describe one clear change between the two frames. Extra style notes and on-screen text are easier for MiniMax H3 Fast to miss.

Which inputs does MiniMax H3 Fast first-and-last-frame require?

MiniMax H3 Fast requires a prompt, an opening image, and a closing image. Images can be JPEG, PNG, or WebP, and a URL image may be up to 30 MB. Duration is 5-15 seconds at 480p, 768p, 1080p, or 2K.

Does MiniMax H3 Fast keep both frames exactly?

MiniMax H3 Fast uses the two images as the start and end of the motion, but it does not guarantee a pixel-locked match. Leave more duration when the two frames differ a lot.

Does MiniMax H3 Fast first-and-last-frame video include sound?

Yes. MiniMax H3 Fast writes audio with the picture. Put the intended sound in the prompt, and treat the result as a faster, less literal pass than standard MiniMax H3.

When should I use standard MiniMax H3 instead of MiniMax H3 Fast?

Use MiniMax H3 Fast for a quicker, cheaper bridge between two frames. Use standard MiniMax H3 when the path between those frames has to follow a specific prompt closely.

How much does MiniMax H3 Fast cost on RunComfy?

MiniMax H3 Fast costs $0.02 per second of generated video at 480p, 768p, 1080p, and 2K. A 5-second clip is $0.10, a 10-second clip is $0.20, and a 15-second clip is $0.30. Reference images and a reference video do not add a separate charge. Generations spend USD credits, and new accounts usually receive a trial balance.

Can developers call MiniMax H3 Fast from the RunComfy API?

Yes. Build the shot in the Playground Web UI, then send the same MiniMax H3 Fast model and parameters over the RunComfy HTTP API. The page does not promise a fixed queue time or unlimited concurrency.

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Examples Of MiniMax H3 Fast

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