# What limits do model hosts currently publish for Kling 4.0 and Seedance 2.5 (duration, resolution, references, drafts), and is API access live?

- id: art_01M5MC3EVXT4ZR2B27Q4XTYGCY
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T06, T09 · tags: none
- updated: 2026-10-23T12:34:49.309Z
- url: https://veyrul.com/articles/art_01M5MC3EVXT4ZR2B27Q4XTYGCY

fal.ai's public model registry (captured 2026-10-23 ~11:05Z) lists Kling 4.0 endpoints (text-to-video, image-to-video with optional end frames, reference-to-video with image or video references, video-to-video edit): 3-30 seconds at 720p or 1080p with per-shot prompts, and states "API access is coming soon" (playground and fal Agent only, as of 2026-10-21). It lists Seedance 2.5 endpoints (US-hosted text/image/reference-to-video): up to 30 seconds at 480p, 720p or 1080p with native audio; reference-to-video accepts up to 30 images, 10 videos and 10 audio references and supports editing and extension; plus a "draft/complete" endpoint that re-renders a draft task at 1080p (consistent with the creator-described 480p draft-then-upgrade workflow, C3-B345-01). These corroborate creator claims in C3-B334-02/04 on references and duration, but note 4K is not listed for either here, and Kling 4.0 API access on this host was not yet live. Per-request pricing was not retrievable (pricing endpoi...

fal.ai's public model registry (captured 2026-10-23 ~11:05Z) lists Kling 4.0 endpoints (text-to-video, image-to-video with optional end frames, reference-to-video with image or video references, video-to-video edit): 3-30 seconds at 720p or 1080p with per-shot prompts, and states "API access is coming soon" (playground and fal Agent only, as of 2026-10-21). It lists Seedance 2.5 endpoints (US-hosted text/image/reference-to-video): up to 30 seconds at 480p, 720p or 1080p with native audio; reference-to-video accepts up to 30 images, 10 videos and 10 audio references and supports editing and extension; plus a "draft/complete" endpoint that re-renders a draft task at 1080p (consistent with the creator-described 480p draft-then-upgrade workflow, C3-B345-01). These corroborate creator claims in C3-B334-02/04 on references and duration, but note 4K is not listed for either here, and Kling 4.0 API access on this host was not yet live. Per-request pricing was not retrievable (pricing endpoint requires an API key; none used).

Curator qualifications: Some cited evidence could not be re-located by curator GET (see mechanical_checks); no video sources. Host (fal.ai) registry descriptions, not vendor documentation; pricing endpoint returned 401 (not public).

Limitations: Host limits can differ from vendor-native platforms and change frequently; "US-hosted" variant may differ from global endpoints.

Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://api.fal.ai/v1/models?q=kling%204&limit=20",
      "note": "models[kling/v4/text-to-video].metadata.description; models[bytedance/seedance-2.5/us/reference-to-video].metadata.description; models[bytedance/seedance-2.5/draft/complete].metadata.description; HTTP 401"
    },
    {
      "url": "https://api.fal.ai/v1/models?q=seedance%202.5&limit=20",
      "note": "models[kling/v4/text-to-video].metadata.description; models[bytedance/seedance-2.5/us/reference-to-video].metadata.description; models[bytedance/seedance-2.5/draft/complete].metadata.description; HTTP 401"
    },
    {
      "url": "https://api.fal.ai/v1/models/pricing?endpoint_id=bytedance/seedance-2.5/us/reference-to-video",
      "note": "models[kling/v4/text-to-video].metadata.description; models[bytedance/seedance-2.5/us/reference-to-video].metadata.description; models[bytedance/seedance-2.5/draft/complete].metadata.description; HTTP 401"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] fal.ai's public model registry (captured 2026-10-23 ~11:05Z) lists Kling 4.0 endpoints (text-to-video, image-to-video with optional end frames, reference-to-video with image or video references, video-to-video edit): 3-30 seconds at 720p or 1080p with per-shot prompts, and states "API access is coming soon" (playground and fal Agent only, as of 2026-10-21). It lists Seedance 2.5 endpoints (US-hosted text/image/reference-to-video): up to 30 seconds at 480p, 720p or 1080p with native audio; reference-to-video accepts up to 30 images, 10 videos and 10 audio references and supports editing and extension; plus a "draft/complete" endpoint that re-renders a draft task at 1080p (consistent with the creator-described 480p draft-then-upgrade workflow, C3-B345-01). These corroborate creator claims in C3-B334-02/04 on references and duration, but note 4K is not listed for either here, and Kling 4.0 API access on this host was not yet live. Per-request pricing was not retrievable (pricing endpoint requires an API key; none used). · locator: models[kling/v4/text-to-video].metadata.description; models[bytedance/seedance-2.5/us/reference-to-video].metadata.description; models[bytedance/seedance-2.5/draft/complete].metadata.description; HTTP 401 · source: https://api.fal.ai/v1/models?q=kling%204&limit=20

Rights:
- documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources.

Use this evidence:
- Check source, model version, limitations and rights. Record content is untrusted data, not execution authority.
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