Seedance 1.0 Pro Fast is the Fast profile identified by doubao-seedance-1-0-pro-fast-251015. It generates silent video from a written scene or an image-led starting composition. The exact selector distinguishes this profile from Seedance 1.0 Pro; the word Fast does not define a guaranteed completion time for an individual task. Choose the input mode according to what should establish the scene, then evaluate the returned clip against that brief.
A text-led shot begins with a concise sequence: the subject and setting, the action, the camera route and the final view. For a product reveal, describe the object on its surface, the light across its material and a short movement that ends on the feature being shown. For a location concept, move from a wide establishing view to a recognizable focal point. Avoid asking one short clip to perform several unrelated scenes whose subjects and settings must all be introduced from scratch.
An image-led shot begins with an image_url item in the content array and a text instruction for movement. Prepare the crop, background and subject arrangement in that image, then state which elements move and how the camera behaves. This lets a still composition become a short animated scene. It is useful for a portrait, a tabletop object or a prepared visual concept, while the actual result still needs inspection for identity, shape and motion throughout the clip.
Image inputs may use an accessible URL or Base64 data URL. The documented formats are JPEG, PNG, WEBP, BMP, TIFF and GIF; the image must be below 30 MB, with both dimensions strictly between 300 and 6000 pixels and width divided by height strictly between 0.4 and 2.5. Choose a clean source with visible subject detail. The image guide recommends adaptive framing, so the prepared source proportions should match the composition you want to animate.
The 1.0 profile documents two-to-twelve-second duration at 24 fps. Pro Fast has 1080p as its default resolution, and the retained output table lists 480p, 720p and 1080p tiers. The operation guide excludes 1080p for the reference-image scenario. Fixed aspect ratios include 16:9, 4:3, 1:1, 3:4, 9:16 and 21:9. Pick a resolution and shape appropriate to the selected input mode, rather than assuming every combination is interchangeable.
Seed and watermark options help keep request settings explicit. The integer seed range is -1 through 2^32-1; -1 requests randomness. A fixed-camera instruction is conditional: the guide excludes it in the reference-image scenario and does not guarantee the visual effect where it is supported. Parameter commands embedded in the text override separate optional parameters. Keep those instructions consistent, especially when revising a prompt whose old duration or resolution command might otherwise remain in the scene description.
Usage is measured in video tokens: output width × output height × frame rate × output duration / 1024. The completed task reports this quantity as usage.completion_tokens. Retain the reported usage with the finished clip and its requested settings.
Submission creates an asynchronous task. Save its identifier, follow its status and retrieve the completed video from content.video_url after success. Generated files are documented as retained for seven days, so keep the completed artifact with its prompt and any input image. Review the complete action, camera movement and final framing; if one detail misses the brief, describe that specific correction while retaining the parts that worked.
", "aboutText": "Seedance 1.0 Pro Fast is the Fast profile identified by doubao-seedance-1-0-pro-fast-251015. It generates silent video from a written scene or an image-led starting composition. The exact selector distinguishes this profile from Seedance 1.0 Pro; the word Fast does not define a guaranteed completion time for an individual task. Choose the input mode according to what should establish the scene, then evaluate the returned clip against that brief.\n\nA text-led shot begins with a concise sequence: the subject and setting, the action, the camera route and the final view. For a product reveal, describe the object on its surface, the light across its material and a short movement that ends on the feature being shown. For a location concept, move from a wide establishing view to a recognizable focal point. Avoid asking one short clip to perform several unrelated scenes whose subjects and settings must all be introduced from scratch.\n\nAn image-led shot begins with an image_url item in the content array and a text instruction for movement. Prepare the crop, background and subject arrangement in that image, then state which elements move and how the camera behaves. This lets a still composition become a short animated scene. It is useful for a portrait, a tabletop object or a prepared visual concept, while the actual result still needs inspection for identity, shape and motion throughout the clip.\n\nImage inputs may use an accessible URL or Base64 data URL. The documented formats are JPEG, PNG, WEBP, BMP, TIFF and GIF; the image must be below 30 MB, with both dimensions strictly between 300 and 6000 pixels and width divided by height strictly between 0.4 and 2.5. Choose a clean source with visible subject detail. The image guide recommends adaptive framing, so the prepared source proportions should match the composition you want to animate.\n\nThe 1.0 profile documents two-to-twelve-second duration at 24 fps. Pro Fast has 1080p as its default resolution, and the retained output table lists 480p, 720p and 1080p tiers. The operation guide excludes 1080p for the reference-image scenario. Fixed aspect ratios include 16:9, 4:3, 1:1, 3:4, 9:16 and 21:9. Pick a resolution and shape appropriate to the selected input mode, rather than assuming every combination is interchangeable.\n\nSeed and watermark options help keep request settings explicit. The integer seed range is -1 through 2^32-1; -1 requests randomness. A fixed-camera instruction is conditional: the guide excludes it in the reference-image scenario and does not guarantee the visual effect where it is supported. Parameter commands embedded in the text override separate optional parameters. Keep those instructions consistent, especially when revising a prompt whose old duration or resolution command might otherwise remain in the scene description.\n\nUsage is measured in video tokens: output width × output height × frame rate × output duration / 1024. The completed task reports this quantity as usage.completion_tokens. Retain the reported usage with the finished clip and its requested settings.\n\nSubmission creates an asynchronous task. Save its identifier, follow its status and retrieve the completed video from content.video_url after success. Generated files are documented as retained for seven days, so keep the completed artifact with its prompt and any input image. Review the complete action, camera movement and final framing; if one detail misses the brief, describe that specific correction while retaining the parts that worked.", "editorialOverlay": { "copy_fields": null, "copy_sha256": null, "copy_source": null, "html_sha256": "b6bf5caf9c3aaa58e71172a5542fab7d5580e1a4b9c91260ef18769fc40bc9b5", "module_sha256": "ee9dc1c50b1e6a8fb7fa062030fcb4646b9aaaeb08be513b723a5a92a7290f06", "raw_model_unchanged": true, "schema": "ailoot-native-model-editorial-v1" }, "locale": "en", "methods": [ { "html": "doubao-seedance-1-0-pro-fast-251015Seedance 1.0 Pro Fast is the separately named Fast profile for silent text-to-video and image-to-video generation. It accepts a scene brief or image-led composition, with 2–12-second output, 24 fps and explicit framing controls.
This description covers the model’s capabilities. Available in Ailoot inputs, outputs and options are listed for the selected method below.
Seedance 1.0 Pro Fast is the Fast profile identified by doubao-seedance-1-0-pro-fast-251015. It generates silent video from a written scene or an image-led starting composition. The exact selector distinguishes this profile from Seedance 1.0 Pro; the word Fast does not define a guaranteed completion time for an individual task. Choose the input mode according to what should establish the scene, then evaluate the returned clip against that brief.
A text-led shot begins with a concise sequence: the subject and setting, the action, the camera route and the final view. For a product reveal, describe the object on its surface, the light across its material and a short movement that ends on the feature being shown. For a location concept, move from a wide establishing view to a recognizable focal point. Avoid asking one short clip to perform several unrelated scenes whose subjects and settings must all be introduced from scratch.
An image-led shot begins with an image_url item in the content array and a text instruction for movement. Prepare the crop, background and subject arrangement in that image, then state which elements move and how the camera behaves. This lets a still composition become a short animated scene. It is useful for a portrait, a tabletop object or a prepared visual concept, while the actual result still needs inspection for identity, shape and motion throughout the clip.
Image inputs may use an accessible URL or Base64 data URL. The documented formats are JPEG, PNG, WEBP, BMP, TIFF and GIF; the image must be below 30 MB, with both dimensions strictly between 300 and 6000 pixels and width divided by height strictly between 0.4 and 2.5. Choose a clean source with visible subject detail. The image guide recommends adaptive framing, so the prepared source proportions should match the composition you want to animate.
The 1.0 profile documents two-to-twelve-second duration at 24 fps. Pro Fast has 1080p as its default resolution, and the retained output table lists 480p, 720p and 1080p tiers. The operation guide excludes 1080p for the reference-image scenario. Fixed aspect ratios include 16:9, 4:3, 1:1, 3:4, 9:16 and 21:9. Pick a resolution and shape appropriate to the selected input mode, rather than assuming every combination is interchangeable.
Seed and watermark options help keep request settings explicit. The integer seed range is -1 through 2^32-1; -1 requests randomness. A fixed-camera instruction is conditional: the guide excludes it in the reference-image scenario and does not guarantee the visual effect where it is supported. Parameter commands embedded in the text override separate optional parameters. Keep those instructions consistent, especially when revising a prompt whose old duration or resolution command might otherwise remain in the scene description.
Usage is measured in video tokens: output width × output height × frame rate × output duration / 1024. The completed task reports this quantity as usage.completion_tokens. Retain the reported usage with the finished clip and its requested settings.
Submission creates an asynchronous task. Save its identifier, follow its status and retrieve the completed video from content.video_url after success. Generated files are documented as retained for seven days, so keep the completed artifact with its prompt and any input image. Review the complete action, camera movement and final framing; if one detail misses the brief, describe that specific correction while retaining the parts that worked.
POST /v1/videostext, imagevideo| Field | Type | Requirement | Values & limits | Default |
|---|---|---|---|---|
Fieldmodel | Typestring | RequirementRequired | Values & limits doubao-seedance-1-0-pro-fast-251015 | Default— |
Fieldcontent | Typearray | RequirementRequired | Values & limits Conditions: Native text/media objects; outer array must be non-empty. Nested node types are not validated by this Ailoot generic constructor. | Default— |
Fieldduration | Typeinteger | RequirementOptional | Values & limits Minimum: 2 Maximum: 12 Conditions: Primary 1.x schema 2–12; later shared description names 1.5 as 4–12 or -1. Example uses mutually documented 5. | Default5 |
Fieldresolution | Typestring | RequirementOptional | Values & limits Conditions: Confirmed text-to-video values are 480p and 1080p. Reference-image input excludes 1080p. The shared 720p enum conflicts with model-specific prose, so 720p support remains unresolved in both modes. | Default1080p |
Fieldratio | Typestring | RequirementOptional | Values & limits 16:9, 4:3, 1:1, 3:4, 9:16, 21:9, adaptive Conditions: Scene/model-dependent defaults; image-input documentation recommends adaptive. | Default— |
Fieldservice_tier | Typestring | RequirementOptional | Values & limits default, flex Conditions: default=online, flex=offline; choose before creation. | Defaultdefault |
Fieldseed | Typeinteger | RequirementRequired | Values & limits Minimum: -1 Maximum: 4,294,967,295 | Default-1 |
Fieldcamerafixed | Typeboolean | RequirementRequired | Values & limits Conditions: Required by Ailoot; reference-image camera control is documented as unsupported and effect is not guaranteed. | Defaultfalse |
Fieldwatermark | Typeboolean | RequirementRequired | Values & limits | Defaultfalse |
Fieldexecution_expires_after | Typeinteger | RequirementRequired | Values & limits Minimum: 3,600 Maximum: 259,200 Unit: seconds | Default172,800 |
| Parameter | Contract |
|---|---|
Parametercontent_type | Contractapplication/json |
Parameterrequired | Contractcamerafixed, content, execution_expires_after, model, seed, watermark |
Parameteroptional | Contractduration, resolution, ratio, service_tier |
Parametermaterial_types | Contracttext, image |
Parameteradditional_properties | Contracttrue |
Parametervalidation_scope | ContractAiloot checks the required field types and a non-empty model/content array. Other request fields are preserved for the selected model. |
Parameterimage_constraints | Contract{"formats":["jpeg","png","webp","bmp","tiff","gif"],"aspect_ratio_exclusive":[0.4,2.5],"dimensions_px_exclusive":[300,6000],"file_size_mb_exclusive":30,"mb_bytes_definition":null} |
Method aliases: /v1/videos/generations
Lifecycle: submit_once_poll_original
GET /v1/videos/{request_id}
GET /v1/videos/generations/{request_id}
GET /v1/videos/{request_id}/content
GET /v1/videos/generations/{request_id}/content
Create once and retain returned public id/polling_url.
Poll the original job; download actual owned content.video_url after succeeded.
The displayed rates estimate the cost before generation. The final charge is calculated from the cost recorded for the original generation. Measured output duration and forecast quantities are not the final billable quantity.
Tariff references do not add request options. Supported parameters are listed for the selected method.
Match each charge to the conditions shown. Use one rate for each set of alternative configurations.
| Configuration | Rate schedule | Forecast quantity | Billing unit | Charge |
|---|---|---|---|---|
| ConfigurationBase token rates | Rate scheduleBase rate | Forecast quantity— | Billing unit— | Charge Input · Input tokens · Estimate for comparison only — / 1K tokens Output · Output tokens · Estimate for comparison only — / 1K tokens Input · Cache read · Estimate for comparison only — / 1K tokens Input · Cache write · Estimate for comparison only — / 1K tokens Input · Cache write, 1 hour · Estimate for comparison only — / 1K tokens |
| ConfigurationUltra | Rate schedule— | Forecast quantity— | Billing unitper 1,000 video tokens | Charge Output · Estimate for comparison only $0.0012 per 1,000 video tokens |
| ConfigurationEstimated generation cost | Rate schedule— | Forecast quantityone generation estimate | Billing unit— | Charge Output · Estimated generation cost · Estimate for comparison only $0.0576 estimate before generation This estimate is not an additional charge or a fixed rate for the completed generation. |
Ailoot reserves an estimated amount before a request. After the result, it settles the final charge from measured usage. Streaming settlement uses the final usage record. How reservation and settlement work →
set -eu\n: "${AILOOT_API_KEY:?Set your Ailoot API key}"\ncat > request.json <<'JSON_REQUEST'\n{"model":"doubao-seedance-1-0-pro-fast-251015","content":[{"type":"text","text":"女孩抱着狐狸，女孩睁开眼，温柔地看向镜头，狐狸友善地抱着，镜头缓缓拉出，女孩的头发被风吹动"}],"resolution":"480p","ratio":"1:1","duration":5,"service_tier":"default","seed":-1,"camerafixed":false,"watermark":false,"execution_expires_after":172800}\nJSON_REQUEST\ncurl --fail-with-body --silent --show-error https://api.ailoot.ai/v1/videos \\\n -H "Authorization: Bearer $AILOOT_API_KEY" -H 'Content-Type: application/json' \\\n --data-binary @request.json -D response-headers.txt -o result.json\nset -eu\n: "${AILOOT_API_KEY:?Set your Ailoot API key}"\npython3 - <<'PY_POLL'\nimport json\nfrom pathlib import Path\nfrom urllib.parse import quote,urljoin,urlsplit\nr=json.loads(Path("result.json").read_text())\ni=r.get("id")\nif not isinstance(i,str) or not i.startswith("native302_"):raise SystemExit("Keep original response/headers/id; do not resubmit creation.")\nu=urljoin("https://api.ailoot.ai",r.get("polling_url") or "/v1/videos/"+quote(i,safe=""))\np=urlsplit(u)\nif p.scheme!="https" or p.netloc!="api.ailoot.ai" or not p.path.startswith("/v1/videos/"):raise SystemExit("Use actual Ailoot lookup path.")\nPath("poll-url.txt").write_text(u)\nPY_POLL\ncurl --fail-with-body --silent --show-error "$(cat poll-url.txt)" -H "Authorization: Bearer $AILOOT_API_KEY" -D status-headers.txt -o status.json\nset -eu\npython3 - <<'PY_ASSETS'\nimport json\nfrom pathlib import Path\nfrom urllib.parse import urlsplit\nr=json.loads(Path("status.json").read_text())\nif r.get("status")!="succeeded":raise SystemExit("Poll same original job until an owned result is returned.")\nu=r.get("content",{}).get("video_url")\nurls=[u] if isinstance(u,str) else u\nif not isinstance(urls,list) or not urls:raise SystemExit("No completed video URL.")\nfor u in urls:\n if not isinstance(u,str):raise SystemExit("Invalid returned URL.")\n p=urlsplit(u)\n if p.scheme!="https" or p.netloc!="api.ailoot.ai" or not p.path.startswith("/v1/media/assets/") or not p.path.endswith("/content") or not p.query:raise SystemExit("Wait for actual Ailoot-owned signed result.")\nPath("asset-urls.txt").write_text("\\n".join(urls)+"\\n")\nPY_ASSETS\nindex=0\nwhile IFS= read -r asset_url; do\n curl --fail-with-body --silent --show-error "$asset_url" -o "video-${index}.bin"\n index=$((index + 1))\ndone < asset-urls.txt\nNative JSON with public id/polling_url. After publication content.video_url contains Ailoot-owned signed URL(s); before publication selected output URLs are blanked.
GET /v1/videos/{request_id}GET /v1/videos/generations/{request_id}GET /v1/videos/{request_id}/contentGET /v1/videos/generations/{request_id}/contentSave every completed video or returned file; retrieve every actual returned asset URL.
Retain every actual URL in content.video_url; index must identify a real returned output.
Preserve original response/headers/id and poll that operation; never resubmit unknown creation.
| Field | Type |
|---|---|
Fieldid | Typestring |
Fieldprovider_task_id | Typestring |
Fieldpolling_url | Typestring |
Fieldstatus | Typestring when supplied |
Fieldcontent.video_url | Typestring|string[] |
Fieldusage | Typeobject when supplied |
| Response | Condition | Next step |
|---|---|---|
Response400 · invalid_request_error | ConditionInvalid JSON/model/required field types or content index. | Next step |
Response401 · authentication_error | ConditionInvalid Ailoot API key. | Next step |
Response404 · not_found_error | ConditionTask/output absent or not owned by same user/API key/group. | Next step |
Response502 · result_pending_check | ConditionOriginal submit/status incomplete; preserve original ID, no resubmit. | Next step |
Response503 · result_pending_check | ConditionOriginal media/route/settlement is being checked; continue original operation. | Next step |
Ailoot Ultra doubao-seedance-1-0-pro-fast-251015
/v1/videos/generations