For a new integration, Sora is no longer an option: OpenAI discontinued its Sora API on September 24, 2026. Runway currently lists Seedance 2.0, Gen-4.5, and Gen-4 Turbo as separate API models. Seedance 2.0 is the clearest documented choice here for developers who need text, image, video, and audio inputs, but the available official documentation does not establish a universal winner for output quality, speed, reliability, or total cost.
What is actually available to developers?
The comparison needs a date-sensitive reading. OpenAI’s discontinuation notice says the Sora web and app experiences ended on April 26, 2026, and the API followed on September 24, 2026. OpenAI’s API reference still describes how Sora requests worked, but it is historical documentation—not a usable integration path.
Runway’s current developer catalog lists Seedance 2.0 under the model ID seedance2. It also lists Gen-4.5 and Gen-4 Turbo separately. So “Runway Gen-4” is not specific enough when choosing a current model or following implementation instructions.
How do the documented API options compare?
This table distinguishes current catalog listings from historical Sora documentation. “Not stated” means the cited official documentation does not establish that detail; it does not mean the model cannot support it.
#1 Best Overall
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| Comparison point | Seedance 2.0 through Runway | Runway Gen-4.5 / Gen-4 Turbo | OpenAI Sora |
|---|---|---|---|
| Availability | Listed in Runway’s developer catalog as a current model. | Gen-4.5 and Gen-4 Turbo are listed as separate models in Runway’s developer catalog. | API discontinued September 24, 2026; not a current option, per OpenAI’s discontinuation notice. |
| Model name | seedance2, according to Runway’s catalog. |
Use the exact catalog name: Gen-4.5 or Gen-4 Turbo. “Gen-4” alone is ambiguous. | The historical API reference names sora-2 and sora-2-pro. |
| Documented inputs | Text, image, video, and audio inputs, according to Runway’s Seedance 2.0 guide. | Runway describes Gen-4.5 as text-to-video and image-to-video. The reviewed catalog does not state Gen-4 Turbo’s input modalities. | The historical API reference documents an optional image reference input; other input modalities are not stated in that reference. |
| Clip duration | 5–15 seconds, according to Runway’s Seedance 2.0 guide. | Not stated in the reviewed Runway catalog. | 4, 8, or 12 seconds in OpenAI’s historical API reference; those choices are not a usable current API offer. |
| Resolution and aspect ratio | Output up to 1080p and multiple aspect ratios, according to Runway’s Seedance 2.0 guide. | Not stated in the reviewed Runway catalog. | The historical API reference lists supported output sizes, but the reviewed source notes do not enumerate them. The API has been discontinued. |
| Audio | Runway describes audio controls and documents audio as an input modality in its Seedance offering. | Not stated in the reviewed Runway catalog. | Not stated in the reviewed historical API reference. |
| Published price | Runway’s catalog lists a starting rate of $0.36 per second, accessed in 2026. This is a listed starting rate, not a normalized total-cost comparison. | Not stated in the reviewed Runway catalog. | Not stated in the reviewed historical API reference; the API is discontinued. |
When does Seedance 2.0 fit a developer’s requirements?
Seedance 2.0 is the best-documented active option in this comparison when an application needs to supply different kinds of reference material. Runway’s guide lists text, image, video, and audio inputs, with clip lengths from 5 to 15 seconds, output up to 1080p, and multiple aspect ratios. Runway describes its API offering as supporting controls for duration, aspect ratio, and audio.
Those are vendor-documented capabilities, not results from a controlled comparison. Check the current Runway documentation and account access before building around a particular input mode, output setting, or billing assumption; listed catalog details do not establish regional or account-level availability for every developer.
How should you choose between Runway’s current model names?
Choose by the exact task and model entry
Runway describes Gen-4.5 as supporting text-to-video and image-to-video. Its catalog lists Gen-4 Turbo separately, but the reviewed catalog information does not establish comparable input, duration, resolution, audio, or price details for that model. If you are evaluating either model, compare its own current documentation rather than assuming Gen-4.5’s stated capabilities apply to Gen-4 Turbo.
Rank #2
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Use the precise model ID in implementation planning
Refer to the catalog’s exact model name and its corresponding API instructions in code, configuration, and team documentation. The available material identifies Seedance 2.0 as seedance2 but does not provide a current endpoint path for Seedance or the Gen-4 models. Do not infer an endpoint from the model name.
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OpenAI’s historical API reference describes a POST /v1/videos job-creation request, optional image reference input, the model names sora-2 and sora-2-pro, duration choices of 4, 8, or 12 seconds, supported output sizes, and a remix endpoint. Those details can help teams understand or document a former Sora integration, but they do not make the endpoints operational after the API’s discontinuation.
Replacing Sora should be treated as a provider migration, not a model-name substitution. Before selecting a replacement, inventory which Sora behaviors your application depends on—such as image references, clip lengths, output sizing, or remix—and verify each requirement against the replacement’s current API documentation. Then isolate provider-specific request and response handling behind an application-level interface, update the request mapping and downstream job handling for the chosen provider, and test the change against your own acceptance criteria. The official material reviewed here does not establish that another provider has a drop-in-compatible Sora endpoint.
Rank #3
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Can you identify a quality, speed, or reliability winner?
No. The official documentation described here establishes product listings, selected capabilities, and one listed starting price; it does not provide a controlled side-by-side benchmark for generation quality, latency, or reliability. Nor does the Seedance starting rate alone establish which option has the lowest total cost: the compared official sources do not provide a normalized cost calculation across models, modes, and billing conditions.
If those factors determine your choice, run a workload-specific evaluation rather than treating product labels or feature lists as a ranking. Keep prompts and reference assets consistent, define what counts as an acceptable output and completion time, and record actual costs under the account and settings you plan to use. That produces evidence for your application without presenting an undocumented universal winner.
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Which AI video generation API should developers use?
- For a new integration with documented multimodal inputs: evaluate Runway’s Seedance 2.0 under
seedance2, then confirm the current account, mode, and billing details. - If you specifically want Runway Gen-4: decide whether you mean Gen-4.5 or Gen-4 Turbo, and verify that model’s own current API documentation before implementation.
- If you are maintaining Sora code: plan a migration. Sora’s API documentation is useful as a record of the former interface, not as an active service path.
- If your decision depends on comparative performance or cost: test your own workload; the official material cited here does not support a universal ranking.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
