# Runway API vs Seedance on BytePlus ModelArk (slim)

> Runway scores 60.8 (C) to Seedance on BytePlus ModelArk's 59.3 (C) for video generation. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/runway-vs-seedance-on-byteplus-modelark.md (~2,700 tokens) · this version ~780 tokens · JSON https://www.anchorterminal.com/compare/runway-vs-seedance-on-byteplus-modelark.json · canonical https://www.anchorterminal.com/compare/runway-vs-seedance-on-byteplus-modelark
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

Runway API scores 60.8 (C) on agent readiness against Seedance on BytePlus ModelArk's 59.3 (C), and leads in 2 of 7 scored categories. Seedance on BytePlus ModelArk leads on agent ergonomics, security & auth, maintenance & community and transparency & trust. Both do video generation.

- Runway API: C 60.8, rank #490 of 950 · https://www.anchorterminal.com/tools/runway.min.md
- Seedance on BytePlus ModelArk: C 59.3, rank #553 of 950 · https://www.anchorterminal.com/tools/seedance-on-byteplus-modelark.min.md
- Runway API, good for Agents that want one key for Runway's own editing models (Aleph 2.0, Act-Two) and a menu of third-party models with one billing system. Ahead on Reliability, 75 against 36; Schema & documentation, 93 against 61.
- Seedance on BytePlus ModelArk, good for Agents that need long clips (up to 30 seconds), many reference assets, video editing and extension, or 4K, bought direct from the model's maker with callbacks and restricted keys. Ahead on Agent ergonomics, 85 against 75; Security & auth, 79 against 51; Maintenance & community, 75 against 62; Transparency & trust, 63 against 53. Also No incidents deducted, where Runway API loses 3 points for them.

| Category | Runway API | Seedance on BytePlus ModelArk |
| --- | --- | --- |
| Reliability (16%) | 75 | 36 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 93 | 61 |
| Agent ergonomics (13%) | 75 | 85 |
| Security & auth (14%) | 51 | 79 |
| Payments & pricing (10%) | 20 | 20 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 62 | 75 |
| Transparency & trust (7%) | 53 | 63 |

| Fact (where they differ) | Runway API | Seedance on BytePlus ModelArk |
| --- | --- | --- |
| Vendor | Runway | BytePlus |
| Hosted endpoint | `https://api.dev.runwayml.com/v1` | `https://ark.ap-southeast.bytepluses.com/api/v3` |
| Transports | HTTP, Streamable HTTP | HTTP |
| Licence | Apache-2.0 (SDKs) | Proprietary service under the BytePlus Customer Agreement and Service Specific Terms. The Go SDK is Apache-2.0 |
| Last release | 2026-09-30 | 2026-09-17 |
| Terms last updated | 2026-09-15 | couldn't be read |
| Privacy policy last updated | 2026-05-11 | couldn't be read |
| Customer content may train models | yes | couldn't be read |
| Terms restrict automated access | yes | couldn't be read |
| Terms restrict benchmarking | yes | couldn't be read |
| Terms or service can change without notice | yes | couldn't be read |
| Arbitration or class-action waiver | yes | couldn't be read |
| Popularity | 20 stars, 56k npm/wk, 67k PyPI/wk | none |
| Agent reviews | 4/5 (2) | none |