How to Generate Seedance 2.5 Video With Codex and fal

The safest way to generate a Seedance 2.5 video with Codex is to use Aident Loadout to discover the current fal Actions, inspect the live Seedance 2.5 contract, preflight one four-second 480p request, and execute only at the cost boundary you approve. Do not hard-code a provider key, copy fields from an older Seedance model, or begin with a production-length render.

This guide produces one bounded text-to-video test from a terminal workflow. It does not automate publishing, make rights decisions for you, or promise that every prompt will produce usable footage. The commands were revalidated on August 18, 2026 against the active bytedance/seedance-2.5/text-to-video endpoint.

Prerequisites

You need:

• Codex or another coding agent with terminal access;

• the public aident CLI installed and authenticated;

• a ready fal connection in Aident Vault;

• Aident credits or an approved billing policy for the generation;

• a prompt and source material you have permission to use; and

• a local folder where you can save the returned result and review notes.

If Aident Loadout is not installed, give Codex this instruction:

Follow https://aident.ai/SETUP.md

Then verify the account and Vault before searching for an Action:

aident account auth status
aident vault vault --action status

Expected result: the account reports authenticated, and the Vault output shows the fal integration as connected and ready. Fix authentication or connection state before moving on.

1. Discover the Current fal Model Catalog

Search by task instead of pasting a saved Action identifier:

aident capabilities search \
  --query "list active fal text-to-video models with pricing and input fields" \
  --types '["action"]' \
  --limit 5

Choose the result whose description says it lists active fal text-to-video models. Do not select a generation Action for this read-only step. Copy that exact Action name, then inspect and run it:

aident capabilities get \
  --name "<models-action-name>" \
  --parts '["description","inputSchema"]'

aident capabilities execute \
  --name "<models-action-name>" \
  --input '{"query":"Seedance 2.5"}'

Expected result: structured JSON identifies the default model and lists active alternatives with descriptions, pricing units, required fields, accepted choices, defaults, and documentation links.

On August 18, 2026, the catalog returned the non-default endpoint bytedance/seedance-2.5/text-to-video. Its live contract required a prompt and exposed optional duration from 4 to 30 seconds, 480p, 720p, or 1080p resolution, common aspect ratios, and synchronized audio. The catalog described pricing per 1,000 tokens using a historical-call estimate. Treat those details as dated evidence, not a permanent contract. Re-run the model-list Action when you generate.

What Changed for Seedance 2.5

This is not a quality comparison with Seedance 2.0. It is a reproducible way to select the current 2.5 endpoint without assuming that the default model, wrapper shortcuts, or cost behavior changed with it.

2. Define a Small, Verifiable First Clip

Use the cheapest useful test that can answer whether the prompt, framing, and motion work:

A concrete prompt separates subject, action, camera, setting, and exclusions:

A small paper boat glides through a rain-lit city gutter at dusk.
One continuous cinematic tracking shot, realistic reflections, four seconds.
No text, no logo, no extra objects

The prompt is an acceptance test, not only a creative description. You should be able to verify the subject, motion, camera, duration, framing, and excluded elements in the returned clip.

3. Discover and Inspect the Generation Action

Search separately for the write Action:

aident capabilities search \
  --query "generate a text-to-video clip with fal" \
  --types '["action"]' \
  --limit 5

Choose the result whose description says it runs an active fal text-to-video model. Copy that exact Action name and inspect its live schema:

aident capabilities get \
  --name "<text-to-video-action-name>" \
  --parts '["description","inputSchema"]'

Confirm that the fields you plan to send are present. The generation Action checked on August 18 accepted a top-level model, the exact provider fields in model_input, and a required prompt. The wrapper's convenience fields do not define every non-default model contract, so keep the selected endpoint and its fields together in the request.

4. Validate the Request Before Spending

Preflight checks the input without dispatching the provider:

aident capabilities preflight \
  --name "<text-to-video-action-name>" \
  --input '{
    "model":"bytedance/seedance-2.5/text-to-video",
    "prompt":"A small paper boat glides through a rain-lit city gutter at dusk. One continuous cinematic tracking shot, realistic reflections, no text, no logos.",
    "model_input":{
      "prompt":"A small paper boat glides through a rain-lit city gutter at dusk. One continuous cinematic tracking shot, realistic reflections, no text, no logos.",
      "duration":"4",
      "resolution":"480p",
      "aspect_ratio":"16:9",
      "generate_audio":false
    }
  }'

Expected result: inputValid is true and validation issues are empty. Fal pricing is dynamic, so a zero or unavailable preflight estimate is not evidence that a provider call is free. Treat the execution step as the spending boundary.

5. Execute Only After Reviewing the Boundary

The next command can incur a charge:

aident capabilities execute \
  --name "<text-to-video-action-name>" \
  --input '{
    "model":"bytedance/seedance-2.5/text-to-video",
    "prompt":"A small paper boat glides through a rain-lit city gutter at dusk. One continuous cinematic tracking shot, realistic reflections, no text, no logos.",
    "model_input":{
      "prompt":"A small paper boat glides through a rain-lit city gutter at dusk. One continuous cinematic tracking shot, realistic reflections, no text, no logos.",
      "duration":"4",
      "resolution":"480p",
      "aspect_ratio":"16:9",
      "generate_audio":false
    }
  }'

The Action quotes current pricing before provider dispatch. If the response requires confirmation, stop, review the exact quote, and obtain human approval. Supply a returned one-time confirmation token only after that approval. Do not lower an expected billing quantity, bypass the Action, or put a fal API key into the prompt to avoid the gate.

When the Action succeeds, keep its structured result and save the returned video to your review folder before any temporary URL expires. Record the prompt, Action result, date, and approved cost with the file.

The August 18 validation returned one H.264 asset after about 146 seconds. Independent media inspection measured 854 by 480 pixels and 4.04 seconds. That confirms this small request path, not every duration, resolution, prompt, or future contract.

6. Review the Clip Before Increasing Quality

Check the result against the request:

1. The clip lasts about four seconds.

2. The frame is 16:9 and usable at the intended crop.

3. The paper boat moves clearly through the frame.

4. The camera follows it in one continuous shot.

5. No text, logo, or extra object appears.

6. The video opens locally and plays through without corruption.

Change one variable per iteration. If motion is wrong, revise the action or camera sentence while keeping duration and resolution fixed. If composition is right but detail is insufficient, then move to 720p. A larger render is evidence-backed only after the small clip passes.

For deterministic editing and final assembly, use a code-native video project after generation. Aident's guide to editing videos with Claude Code and HyperFrames covers reproducible composition, preview, and rendering. For a broader tool choice, compare HeyGen, HyperFrames, and video APIs.

Common Failure Modes

Inspect recent calls without dispatching another generation:

aident audit recent --limit 20

Why This Workflow Works

The model catalog is the current source of truth for model availability, fields, defaults, and pricing units. Schema inspection prevents Codex from inventing parameters. A small preflighted request limits the first experiment. The execution boundary keeps the live quote and any required confirmation attached to the exact normalized input. Vault keeps the provider credential out of the repository and prompt.

This applies the useful structure behind Aident's Ollama networking guide: answer one exact job early, use reproducible commands, state expected results, separate look-alike failures, and explain why each boundary matters. The Ollama post's traffic does not prove that every technical workflow will perform the same way.

Give Codex One Measurable Seedance 2.5 Task

Connect fal through Aident Loadout, then ask Codex to discover the current model-list and text-to-video Actions, select Seedance 2.5 from the live catalog, inspect both schemas, validate one four-second 480p request, and stop at any cost-confirmation boundary. Success means one reviewed clip that matches six explicit acceptance checks, with no provider key in the prompt or repository.

Sources

• Dreamina Seedance 2.5 tutorial, BytePlus ModelArk, accessed August 18, 2026

• Dreamina Seedance 2.5 prompt guide, BytePlus ModelArk, accessed August 18, 2026

• Seedance 2.5 Text to Video API, fal, accessed August 18, 2026

• Codex use cases, OpenAI, accessed July 30, 2026

• Aident Loadout, Aident, accessed July 30, 2026

Refresh this guide when Aident changes capability discovery, preflight, confirmation handling, or audit output, or when fal changes the Seedance 2.5 endpoint, accepted fields, pricing behavior, or result contract.