First to Last Frame vs Sora 2
A practical comparison of First to Last Frame and Sora 2 for controlled video in 2026. Learn how each handles start and end frames, what durations and resolutions they support on Flixly, and when each one wins.
TL;DR
First to Last Frame lets you upload both a start and an end image, so the clip is steered toward the shot you want to finish on; on Flixly it runs on Seedance 2.0 and Seedance 2.0 Fast (4 to 15 seconds). Sora 2 takes text or a single starting image and generates 4 to 20 second clips at 720p, but it has no end-frame input. Costs for both are quoted in the app before you generate.
The frame control problem in video generation
You start a short clip on a fixed character pose and need the final frame to land on a specific key pose without drift. If the model can't aim for that ending, you re-render the sequence until the motion lands where you want, and every attempt costs credits.
Why text prompts alone fall short
Sora 2 relies on a text prompt, optionally with one starting image. A prompt like "character walks left then turns" produces a different path and ending each run. First to Last Frame accepts two explicit images, a start and an end, so the model generates the motion between two known shots instead of guessing the destination.
If you try the same idea in Text to Video, expect the ending to vary between runs. The First to Last Frame mode is designed for exactly this case: you define both endpoints, and the prompt only describes what happens in between.
How First to Last Frame works in practice
Upload your opening still as the first frame and your closing still as the last frame, then describe the motion. On Flixly this mode runs on Seedance 2.0 (4 to 15 seconds, 480p up to 4k) and Seedance 2.0 Fast (4 to 15 seconds, 480p or 720p). Longer clips and higher resolutions raise the cost, and the app quotes the job before you run it.
Edge cases that still need work
- Big differences between the two frames (new camera angle, different lighting) can cause warping or morphing mid-clip.
- Fine or semi-transparent details like hair edges, smoke and water can lose definition during fast motion.
- Mismatched aspect ratios or framing between the start and end images make the transition harder to read.
Sora 2 at a glance
On Flixly, Sora 2 generates 4, 8, 12, 16 or 20 second clips at 720p from text or a single image, in 16:9 or 9:16. It is known for natural-looking motion and physics, but it offers no last-frame input, so keeping clothing, props or an ending pose consistent across shots can take several tries. Sora 2 Pro adds higher resolutions, up to 1080p.
Here's how the options compare on Flixly.
| Tool | Inputs | Best for | Durations | Resolutions | Price |
|---|---|---|---|---|---|
| First to Last Frame (Seedance 2.0) | Start + end image, prompt | Locked character arcs | 4-15s | 480p-4k | Quoted in-app |
| Sora 2 | Text or one start image | Open-ended scenes | 4-20s | 720p | Quoted in-app |
| Veo 3.1 | Text, image or reference | Short cinematic shots | 4, 6 or 8s | 720p, 1080p, 4k | Quoted in-app |
| Kling 3.0 | Text or one start image | Narrative beats | 3-15s | 720p, 1080p, 4k | Quoted in-app |
When to use which
Choose First to Last Frame when your storyboard already contains the opening and closing stills. Switch to Sora 2 when you need new motion that isn't defined by existing frames. Combine both: grab a still of the last frame of a Sora 2 clip and use it as the starting image in Image to Video, or as the first frame of a First to Last Frame shot, to continue the sequence.
For lip-synced dialogue on the same sequence, route the First to Last Frame output through Lip Sync Video as a separate billed pass. To restyle the finished clip, use Video Tools.
Frequently Asked Questions
What do I need to use First to Last Frame?▾
Two still images: the opening frame and the closing frame, ideally with the same aspect ratio and a consistent subject, plus an optional prompt describing the motion between them. The result is a video clip you can download or send to other Flixly tools.
Does Sora 2 support reference images for the final frame?▾
No. On Flixly, Sora 2 supports text-to-video and image-to-video from a single starting image. There is no input for the last frame, so matching a specific ending shot takes re-generations or a different approach.
How many credits does a comparison test cost?▾
It depends on the model, duration and resolution you pick. The app quotes each run before you start it, so set up both jobs with the same duration and compare the quotes side by side.
Can I chain First to Last Frame output into video-to-video edits?▾
Yes. Take the finished clip into Video Tools to apply a restyle preset or effect, or into Lip Sync Video for dialogue. Each pass is billed separately and quoted before you run it.
Is there a length limit difference in 2026?▾
Yes. First to Last Frame on Seedance 2.0 and Seedance 2.0 Fast supports 4 to 15 seconds per generation. Sora 2 offers 4, 8, 12, 16 or 20 seconds, but without an end-frame lock.
