Seedance 2 is the production default for most Codex video workflows. But when you are still figuring out the prompt, the motion direction, or the right clip length — Seedance 2 Fast is the better tool.
This page covers when and how to use Seedance 2 Fast inside Codex, and when to switch back to Seedance 2 for production output.
If you have not set up video generation in Codex yet, start with How to Generate Video with Codex.
The short answer
Use Seedance 2 Fast in Codex when iteration speed matters more than output quality:
- testing three prompt directions before choosing one
- running batch generation across multiple variables
- checking how a motion treatment will feel before committing to a full render
- fitting video generation into a CI/CD loop that needs fast turnaround
For production output — final product demos, launch clips, repeatable marketing assets — switch back to Seedance 2.
Seedance 2 vs Seedance 2 Fast: what actually changes
| Seedance 2 | Seedance 2 Fast | |
|---|---|---|
| Output quality | Production-ready | Iteration-grade |
| Render speed | Standard | Faster |
| Best for | Final output, team default | Prompt testing, batch loops |
In a Codex workflow, only the --model flag changes:
# Iteration pass — fast feedback
anycap video generate \
--prompt "a product demo of a SaaS dashboard, clean UI, soft lighting" \
--model seedance-2-fast \
-o draft.mp4
# Production pass — same prompt, final quality
anycap video generate \
--prompt "a product demo of a SaaS dashboard, clean UI, soft lighting" \
--model seedance-2 \
-o demo.mp4
When Seedance 2 Fast is the right choice in Codex
Prompt direction testing
Test three or four directions with Seedance 2 Fast before committing. Fast feedback, lower cost — enough to tell you whether the motion, pacing, and tone are heading in the right direction.
Batch generation across variables
for i in 1 2 3 4 5; do
anycap video generate \
--prompt "product demo variant $i" \
--model seedance-2-fast \
-o draft-variant-$i.mp4
done
Run all variants fast first. Pick the ones that work. Re-render with Seedance 2.
CI/CD pipeline integration
Seedance 2 Fast is the right default for automated pipelines. Queue a Seedance 2 production render separately when the clip needs to ship publicly.
The rapid iteration loop
The standard two-pass workflow: run Seedance 2 Fast for direction, then commit to Seedance 2 for the final render.
The video below shows this loop in action — a draft pass followed immediately by a production render in the same Codex session.
# Step 1: fast draft
anycap video generate \
--prompt "a SaaS product walkthrough, minimal UI, slow pan across dashboard" \
--model seedance-2-fast \
-o iteration-1.mp4
# Step 2: production render with winning direction
anycap video generate \
--prompt "a SaaS product walkthrough, minimal UI, slow pan across dashboard" \
--model seedance-2 \
-o final-demo.mp4
When to switch back to Seedance 2
- The clip is going to customers or a product page
- The review is about final output quality, not direction
- The prompt is already confirmed — no iteration needed
Use case summary
| Use case | Seedance 2 Fast? | Why |
|---|---|---|
| Prompt direction testing | Yes | fast feedback without full render cost |
| Batch generation | Yes | filter before committing |
| CI/CD pipeline | Yes | speed fits automated cadence |
| Production-ready output | No | use Seedance 2 for anything that ships |
| Team default | No | Seedance 2 is the steadier production default |
The bottom line
Seedance 2 Fast earns its place in Codex by handling the part of the workflow where production quality is not yet the point. Use it early. Move to Seedance 2 when the direction is confirmed.
→ Add video generation to Codex — install AnyCap, free to start