# Seedance on BytePlus ModelArk vs sync. labs MCP server

> Seedance on BytePlus ModelArk scores 59.4 (C) to sync. labs's 51.5 (D) for video edit. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/seedance-on-byteplus-modelark-vs-sync-labs-mcp
- Markdown: https://www.anchorterminal.com/compare/seedance-on-byteplus-modelark-vs-sync-labs-mcp.md (~5,250 tokens)
- Site index for agents: https://www.anchorterminal.com/llms.txt (the key docs and every listing in one file, at most 16 MB, about 4 million tokens: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- DNS: dig +short TXT <slug>.grade.anchorterminal.com (the grade as a DNS TXT record, for a sandbox with no HTTP where names still resolve; also top., best.<category>. and <a>.vs.<b>. under the zone, and the same under grade.letme.dev)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-11-07

Seedance on BytePlus ModelArk scores 59.4 (C) on agent readiness against sync. labs MCP server's 51.5 (D), and leads in 3 of 7 scored categories. sync. labs MCP server leads on schema & documentation, payments & pricing and maintenance & community. Both do video edit.

- Seedance on BytePlus ModelArk: grade C, 59.4/100, rank #706 of 1510. Markdown https://www.anchorterminal.com/tools/seedance-on-byteplus-modelark.md · JSON https://www.anchorterminal.com/api/v1/tools/seedance-on-byteplus-modelark.json
- sync. labs MCP server: grade D, 51.5/100, rank #1026 of 1510. Markdown https://www.anchorterminal.com/tools/sync-labs-mcp.md · JSON https://www.anchorterminal.com/api/v1/tools/sync-labs-mcp.json
- Best video generation for AI agents: https://www.anchorterminal.com/best/video-generation/index.md
- All 183 video comparisons: https://www.anchorterminal.com/compare/video-generation/index.md

## Which one, for what

### Seedance on BytePlus ModelArk (C)

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 55
- Security & auth, 79 against 38
- Transparency & trust, 65 against 44

Watch for: No status page was found on byteplus.com, the docs or the trust centre, and no SLA was found that names ModelArk inference

### sync. labs MCP server (D)

Good for: Agents that lip-sync or dub video into other languages.

Ahead on:
- Schema & documentation, 81 against 61
- Payments & pricing, 30 against 20
- Maintenance & community, 75 against 65

Also in its favour:
- Open source

Watch for: No read-only mode


## Why the edge

### Security & auth: Seedance on BytePlus ModelArk +41

- Seedance on BytePlus ModelArk (79): Per the 9 October check for the docs pages, not re-read on 4 November. Model reading of the checklist (credential, training, retention, operator visibility, programme). API keys belong to a resource project, can be limited to named model IDs or endpoints and to an IP allowlist, and can be disabled or deleted. No expiry or rotation setting was found (28). The service terms say BytePlus will not use customer data to train models unless the customer opts in, and the data processing page and training FAQ agree (20). Task records last 7 days and video URLs 24 hours, DELETE removes a finished task record, and content that triggers the filter is kept 180 days. No general retention period for inputs was found (10). Keys show a last-used time and billing per key, and the console has usage statistics. The inference security audit page says it applies only to Skylark models (8). The trust centre lists ISO 27001, SOC 2 and other certifications for BytePlus as a whole, and the Go SDK repository's SECURITY.md points to the ByteDance security centre and a bounty policy. No security.txt, and no disclosure policy on byteplus.com itself. The Go SDK's SECURITY.md was re-read in a clone on 4 November, and OSV holds no advisory for the Go, Python or Java packages (13).
- sync. labs MCP server (38): OAuth per organisation, or an API key in the environment (22 of 30). No read-only mode (3 of 20). Media in and out, no third-party text (10). No audit log found (0). No security programme found (3 of 20). 22 + 3 + 10 + 0 + 3 = 38.

### Agent ergonomics: Seedance on BytePlus ModelArk +30

- Seedance on BytePlus ModelArk (85): Per the 9 October check, not re-read on 4 November (docs.byteplus.com answered robots.txt with its app page). Create returns only a task ID, the task object is small, and `callback_url` posts each status change so an agent need not poll (25). The list call pages with `page_num` and `page_size` up to 500 and filters by status, task ID, model and service tier, and `resolution`, `ratio` and `duration` size the output (20). Error codes come with a meaning and a suggested fix. On Seedance 2.5 some constraint errors arrive only after the task leaves the queue unless `omni_reference_task_type` is set (17). No idempotency key was found. Only successful videos are charged, a queued task can be cancelled with DELETE and a running one cannot (8). Only `model` and `content` are required, and official SDKs exist for Python, Go and Java (15).
- sync. labs MCP server (55): A generated catalogue filtered by client profile, curated for ChatGPT (15). Project history and estimates (12 of 20). Recovery tools; errors not documented (8 of 20). Annotations not read (5 of 20). OAuth or a key, npm package and library use (15). 15 + 12 + 8 + 5 + 15 = 55.

### Transparency & trust: Seedance on BytePlus ModelArk +21

- Seedance on BytePlus ModelArk (65): Per the 9 October check, not re-read on 4 November (docs.byteplus.com answered robots.txt with its app page). Closed models under the Customer Agreement (effective 30 September 2026) and the Service Specific Terms, which are public and dated. The Go SDK is Apache-2.0. Two cited documents, the General Terms for AI Services and the ModelArk Terms, returned no text to our reader (15). The service terms, the ModelArk data processing page and the training FAQ agree that customer data is not used for training without opt-in. Filter-triggered content is kept 180 days, and no general retention period for inputs is stated. A Data Processing Addendum is incorporated, which we did not open (20). A deprecation policy with a 30 day minimum and dated timetables for each batch (18). Processing locations are named as Malaysia, Indonesia and the EU/EEA, and a sub-processor list effective 24 September 2026 promises 15 days' notice of changes, but it has no ModelArk row (14).
- sync. labs MCP server (44): MIT open source (30). Data handling not read (5 of 30). No deprecation policy; earlier tool names documented as superseded (5 of 20). Subprocessors not found (0). 30 + 5 + 5 + 0 = 40.

### Schema & documentation: sync. labs MCP server +20

- Seedance on BytePlus ModelArk (61): Per the 9 October check, not re-read on 4 November (docs.byteplus.com answered robots.txt with its app page). No OpenAPI or similar file was found. The reference pages link an API Explorer that is drawn by script, which we could not read (0). www.byteplus.com/llms.txt is a short site index, and docs.byteplus.com has no llms.txt or published Markdown twin (3). The create-task reference states which models accept each field, which input modes cannot be mixed, and when to use `frames` over `duration` or set `omni_reference_task_type` (17). Fields carry types, ranges, defaults and per-model values. `content` is a mixed array of text, image, video, audio and draft items, and a legacy mode reads parameters from the prompt text (13). cURL, Python and Java examples in the tutorial, and an error page of about 120 rows with HTTP status, code, message and meaning (15). A versioned `/api/v3` path, dated model IDs, and pages for product updates, model releases, deprecations and an API schema notice. Product updates are dated by month only and stop at August 2026 (13).
- sync. labs MCP server (81): Tools generated from the public API specification plus workflow tools, with typed schemas in the source (25). llms.txt and .md pages (10). Tool table with descriptions (14 of 20). Typed from the API spec (12 of 15). Examples and an estimates tool; errors not documented (8 of 15). Tags v0.2.2 to v0.2.4 and dated commits (12 of 15). 25 + 10 + 14 + 12 + 8 + 12 = 81.

### Payments & pricing: sync. labs MCP server +10

- Seedance on BytePlus ModelArk (20): Per the 9 October check, not re-read on 4 November (docs.byteplus.com answered robots.txt with its app page). No x402, MPP or L402 found (0). Per-token prices for every Seedance model and worked per-second examples are published without a login (20). No free quota is listed for video models, and Seedance 2.5 and 2.0 need a USD 30 balance, savings plan or resource pack before activation (0). A person registers, adds funds, activates the model and creates the key in the console (0).
- sync. labs MCP server (30): No machine payment protocol (0). Per-second prices published (20). A free try for short videos (10 of 20). A person signs up (0). 0 + 20 + 10 + 0 = 30.

### Maintenance & community: sync. labs MCP server +10

- Seedance on BytePlus ModelArk (65): Model reading. The last dated change that touches Seedance is the 8 September 2026 deprecation notice for `seedance-1-5-pro-251215`, 57 days before this check; Dreamina Seedance 2.5 shows "Updated Aug 7, 2026" in the ai.byteplus.com model catalogue on 4 November, with no newer Seedance model. The Go SDK tagged v0.10.0 to v0.19.0 between 29 September and 3 November, but none of them changes its content-generation package, last changed on 26 August, so they don't set recency for this listing (as groq-speech-to-text's SDK releases that don't touch audio). The create-task reference's 8 October page date records no change. 20, in place of 30 (cause time and correction). The deprecation policy promises at least 30 calendar days' notice. `seedance-1-5-pro-251215` got 64 days, from 8 September to 11 November 2026, after about 11 months on sale and with no automatic migration, and a Seedance 1.0 lite model went in the May 2026 batch. The minimum is short (12 of 20). Monthly product updates, model release and deprecation pages, with support by console ticket and a Discord server we did not test, per the 9 October check (11 of 15). Current official SDKs for Python, Go and Java (15). The Go SDK is Apache-2.0 with a CI workflow and 19 tags since its 11 August import, the latest v0.19.0 on 3 November 2026. It is below 1.0 and replaced an older SDK that the docs still need for some APIs (7). 20+12+11+15+7 = 65.
- sync. labs MCP server (75): v0.2.4 and commits on 7 November 2026 (30). Three tags in recent weeks (20). Issues not read (0). Official registry entry io.github.synchronicity-labs/mcp-server (15). CI with verify, publish and review workflows (10). 30 + 20 + 0 + 15 + 10 = 75. Registry presence read from Anchor Terminal's own daily import of the official MCP registry (/api/v1/registry.json, 6 November 2026), not the registry's API.

## Score by category

| Category | Weight | Seedance on BytePlus ModelArk | sync. labs MCP server | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 40 | 43 | sync. labs MCP server +3 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 61 | 81 | sync. labs MCP server +20 |
| Agent ergonomics | 13% (16.2 this run) | 85 | 55 | Seedance on BytePlus ModelArk +30 |
| Security & auth | 14% (17.5 this run) | 79 | 38 | Seedance on BytePlus ModelArk +41 |
| Payments & pricing | 10% (12.5 this run) | 20 | 30 | sync. labs MCP server +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 65 | 75 | sync. labs MCP server +10 |
| Transparency & trust | 7% (8.8 this run) | 65 | 44 | Seedance on BytePlus ModelArk +21 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **59.4 · C** | **51.5 · D** | |

## Facts side by side

| Fact | Seedance on BytePlus ModelArk | sync. labs MCP server |
| --- | --- | --- |
| Kind | Model API | MCP server |
| Vendor | BytePlus | Synchronicity Labs (sync.) |
| Hosted endpoint | `https://ark.ap-southeast.bytepluses.com/api/v3` | `https://mcp.sync.so/mcp` |
| Transports | HTTP | Streamable HTTP |
| Auth | API key | OAuth or key |
| Pricing | Pay per use | Paid |
| x402 | no | no |
| Licence | Proprietary service under the BytePlus Customer Agreement and Service Specific Terms. The Go SDK is Apache-2.0 | MIT |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | not listed | `io.github.synchronicity-labs/mcp-server` |
| Last release | 2026-11-03 | none |
| Terms last updated | couldn't be read | no document linked |
| Privacy policy last updated | couldn't be read | no document linked |
| Customer content may train models | couldn't be read | not read yet |
| Terms restrict automated access | couldn't be read | not read yet |
| Terms restrict benchmarking | couldn't be read | not read yet |
| Terms or service can change without notice | couldn't be read | not read yet |
| Arbitration or class-action waiver | couldn't be read | not read yet |

## How the scores have moved

### Seedance on BytePlus ModelArk

- -0.1 on 4 November 2026: correction, time
- +0.1 on 28 October 2026: new evidence
- +0.1 on 27 October 2026: checklist

### sync. labs MCP server

No score change since it was listed.

## Verdicts

**Seedance on BytePlus ModelArk.** The video task API documents limits, error codes and per-model parameters in detail, with callbacks, a filterable task list and API keys restrictable by model and IP address. No status page, OpenAPI file or free video quota was found, the newest models need a USD 30 balance, and BytePlus model services are not sold in the United States.

**sync. labs MCP server.** sync. labs' MCP server is open source, generated from its API spec with workflow tools on top, and released often, with clear per-second prices for lip sync and dubbing. Security and data handling are thinly documented, and there's no read-only mode.

## Before you call either

### Seedance on BytePlus ModelArk

1. POST to `/api/v3/contents/generations/tasks` on ark.ap-southeast.bytepluses.com, then poll GET `/contents/generations/tasks/{id}` or pass `callback_url`. Callbacks need an answer within 5 seconds
2. Download the result at once. Video URLs last 24 hours, task records 7 days, and a Seedance 2.5 URL allows 100 downloads
3. Pass `resolution`, `ratio` and `duration` in the request body. Parameters appended to the prompt as `--rs` or `--dur` are weakly validated and may be ignored
4. On Seedance 2.5 set `omni_reference_task_type` to `edit` or `extend` so constraint errors arrive at submission. With `auto` they arrive after the task leaves the queue
5. Do not send reference images or video with real human faces to Seedance 2.5 or 2.0. Only a queued task can be cancelled with DELETE

### sync. labs MCP server

1. Get an estimate before long generations
2. Dub or lip-sync only voices and faces the user has the right to use
3. Check the active organisation before connecting with OAuth

## Questions

### Which is better for AI agents, Seedance on BytePlus ModelArk or sync. labs MCP server?

Seedance on BytePlus ModelArk scores 59.4 (C) on agent readiness against sync. labs MCP server's 51.5 (D), and leads in 3 of 7 scored categories. sync. labs MCP server leads on schema & documentation, payments & pricing and maintenance & community.

### Do Seedance on BytePlus ModelArk and sync. labs MCP server need an API key?

Seedance on BytePlus ModelArk needs an API key. sync. labs MCP server takes an API key or an OAuth sign-in.

### Can an agent call Seedance on BytePlus ModelArk and sync. labs MCP server without installing anything?

Yes. Seedance on BytePlus ModelArk has a hosted endpoint at https://ark.ap-southeast.bytepluses.com/api/v3 and sync. labs MCP server at https://mcp.sync.so/mcp.

### Are Seedance on BytePlus ModelArk and sync. labs MCP server open source?

No open-source release is listed for Seedance on BytePlus ModelArk. sync. labs MCP server is open source (MIT).


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/seedance-on-byteplus-modelark-vs-sync-labs-mcp.json, and with the fewest tokens: https://www.anchorterminal.com/compare/seedance-on-byteplus-modelark-vs-sync-labs-mcp.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "seedance-on-byteplus-modelark", "b": "sync-labs-mcp"}`. From a terminal: `anchor compare seedance-on-byteplus-modelark sync-labs-mcp`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/seedance-on-byteplus-modelark.json and https://www.anchorterminal.com/api/v1/tools/sync-labs-mcp.json

## Other comparisons with Seedance on BytePlus ModelArk or sync. labs MCP server

- [Alibaba Wan (Model Studio) vs Seedance on BytePlus ModelArk](https://www.anchorterminal.com/compare/alibaba-wan-vs-seedance-on-byteplus-modelark.md)
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- [Alibaba Wan (Model Studio) vs sync. labs MCP server](https://www.anchorterminal.com/compare/alibaba-wan-vs-sync-labs-mcp.md)
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- [Runway API vs sync. labs MCP server](https://www.anchorterminal.com/compare/runway-vs-sync-labs-mcp.md)
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Query this catalogue directly over MCP: https://www.anchorterminal.com/mcp (Streamable HTTP, no key). How: https://www.anchorterminal.com/agents/#mcp