LongCat-Video and Seedance 2.5: Open-Weight vs Closed Video Generation Compared
A source-based comparison of LongCat-Video (13.6B open-weight DiT, 720p/30fps, text/image-to-video, up to 5-minute generations, self-hostable) and Seedance 2.5 (ByteDance's closed video flagship, 30s native output, 50 multimodal references, built-in audio). Covers architecture, duration, resolution, pricing, licensing, and deployment.
Independent third-party resource. Not affiliated with or endorsed by LongCat, Meituan, DeepSeek, or any other publisher discussed on this page.
Published: 2026-08-14 · Author: LongCat Community Hub editorial team
This is an independent, source-based comparison of LongCat-Video (Meituan) and Seedance 2.5 (ByteDance). It compares documented architecture, generation modes, duration and resolution limits, audio support, pricing, licensing, and deployment options. It does not report performance as a verdict — for publisher-reported scores, see the individual model pages and benchmark index linked below. Every claim on this page is sourced from the linked publisher documentation or attributed third-party coverage.
| Dimension | LongCat-Video | Seedance 2.5 |
|---|---|---|
| Developer | Meituan (LongCat team) | ByteDance (Seed team) |
| Release date | October 2025 | API GA August 7, 2026 (2.5) |
| Parameters | 13.6B (documented) | Undisclosed (proprietary) |
| Architecture | DiT + Block Sparse Attention, documented (arXiv:2510.22200) | Undisclosed |
| Generation modes | Text-to-video, image-to-video, video continuation | Text-to-video, image-to-video, video-to-video |
| Max duration | Up to 5 minutes (~9,000 frames) | 4–30s native per clip; up to 180s in Jimeng ultra-long mode (480p/720p) |
| Resolution / FPS | 720p at 30fps | 480p / 720p via API; 4K native capability reported |
| Reference inputs | Single image reference (I2V); no multi-modal reference workflow documented | Up to 50 multimodal references (30 images + 10 videos + 10 audio) |
| Built-in audio | Not documented in the video model | Yes — synchronized audio by default |
| Editing | Generation tasks only; no timestamp editing documented | Timestamp-precise editing of specific segments (add/delete/modify) |
| Prompt language | Documented for text prompts; no multi-language claim | 10+ languages supported |
| Pricing | Self-hosted at infrastructure cost; no per-second fee | Token-based (~42–70 yuan/M tokens) or ~$0.11–$0.30 per second depending on mode and resolution |
| License | Open source (weights + inference code public) | Proprietary (closed model, API only) |
| Deployment | Self-hosted (server-grade GPU); GitHub/HuggingFace/ModelScope | API only (Volcano Engine, BytePlus; Jimeng consumer app) |
Two Distribution Models for Video Generation
Seedance 2.5 is ByteDance's closed video-generation flagship. Announced at FORCE 2026 on June 23 and rolled out in stages, its API reached general availability on August 7, 2026 through Volcano Engine. Its architecture and parameter count are undisclosed. Its headline capabilities are production-oriented: native 30-second single-clip output (doubled from 2.0's 15 seconds), up to 50 multimodal reference inputs, timestamp-precise editing, built-in synchronized audio, and support for 10+ prompt languages.
LongCat-Video is a fully documented 13.6-billion-parameter open-weight model released in October 2025, built on a Diffusion Transformer backbone with Block Sparse Attention. Its technical report is public, its weights and inference code are on GitHub and HuggingFace, and it unifies text-to-video, image-to-video, and video continuation in one framework. The comparison is therefore, as with the image and language comparisons on this site, a comparison of two distribution models: auditable open weights that can be self-hosted, versus a closed API whose feature set sits behind ByteDance's endpoints.
Duration: Long-Form Open Model vs 30-Second Closed Clips
The most striking documented difference is duration. LongCat- Video targets long-form generation, with the publisher describing temporal consistency across scenes up to 5 minutes (~9,000 frames) using chunk-level stitching and Block Sparse Attention. That is a materially longer single-generation span than Seedance 2.5's native 30 seconds per clip — although Jimeng's ultra-long mode extends Seedance output to 180 seconds at 480p/720p with a reduced 30-reference limit.
For teams that need continuous long scenes in a single generation, LongCat-Video's documented 5-minute window is a different capability class. For teams that need fast, short, controllable clips with precise timestamp control, Seedance 2.5's 4–30s native range with editing is the more polished workflow. The two designs serve different production needs rather than simply different quality levels.
Multimodal Control and Built-in Audio
Seedance 2.5 accepts up to 50 reference inputs spanning images, video, and audio (30 images + 10 video clips + 10 audio clips), and generates synchronized audio by default. It also supports timestamp-precise editing — targeting a specific segment for add, delete, or modify. These are workflow features built for iterative production, and they are only reachable through ByteDance's API or the Jimeng consumer app.
LongCat-Video's documented multimodal surface is narrower: text and image inputs for generation, and video continuation. It does not document multi-reference fusion or built-in audio generation within the video model itself (audio capabilities sit in separate LongCat-family products). For teams that need audio-visual output or heavy multi-source conditioning from one model, Seedance 2.5 offers an integrated path that LongCat- Video does not currently document.
Pricing: Per-Second API vs Infrastructure Cost
Seedance 2.5 is billed on token usage (about 42 yuan per million tokens with video input, 70 yuan per million without, at launch) or equivalently per generated second — roughly $0.11–$0.30 per second depending on mode and resolution, with higher resolution costing more. For a 30-second clip that translates to roughly $3–$9 per generation at API rates, making iteration cost a direct line item for volume work.
LongCat-Video has no per-second fee because there is no hosted API tier to meter: the model is self-hosted at infrastructure cost, or used through the LongCat platform where available. For sustained generation volume, an open-weight model shifts cost from per-output billing to fixed infrastructure — but that trade requires server-grade GPU capacity for the 13.6B model, which is a real hardware requirement rather than a consumer-GPU workload.
Deployment and Availability
Seedance 2.5 is available through Volcano Engine and BytePlus APIs (open to all developers since August 7, 2026), the Jimeng consumer app, and third-party creation platforms. It cannot be self-hosted. LongCat-Video weights and inference code are public under the meituan-longcat GitHub organization and on HuggingFace and ModelScope, with deployment documented on the project page and typically requiring server-grade GPU hardware for 720p/30fps generation.
For teams with data-sovereignty, auditability, or supply-chain requirements, the two models occupy different positions: Seedance 2.5's feature ceiling is high but its availability is controlled by a single vendor's API, while LongCat- Video's weights are inspectable and can run wherever GPU capacity fits.
This comparison is based on publicly available documentation accessed on 2026-08-14. LongCat-Video specifications are from its technical report, GitHub repository, and project page. Seedance 2.5 specifications are from Volcano Engine launch coverage, attributed third-party specification pages, and a timeline/price reference.
This is a feature-level comparison, not a performance evaluation. This site has not independently tested either model. Capability claims are publisher-reported or independently attributed as noted and have not been independently verified by this site.
Pricing and availability are current as of the access date and vary by channel and resolution tier. Seedance 2.5 pricing is token-based and depends on resolution and input mode; verify current terms on each vendor's official documentation before deployment.
Related pages
- LongCat-Video model profile
Full technical brief covering architecture, training, benchmarks, and deployment options.
- LongCat-Video-Avatar 1.5 model profile
The audio-driven digital human model built on the LongCat-Video DiT foundation.
- LongCat-Image vs Seedream 5.0 comparison
The image-generation companion comparison, also open-weight vs closed.
- LongCat-2.0 model profile
The flagship language model that shares the LongCat product family.
Related comparisons in this series
- LongCat-Video and Seedance 2.0: Open-Weight vs Closed Video Generation Compared
A source-based comparison of LongCat-Video (13.6B open-weight DiT, 720p/30fps, up to 5-minute generations, self-hostable) and Seedance 2.0 (ByteDance's closed video model, 4-15s clips, native audio, 480p-1080p). Covers architecture, duration, audio, pricing, licensing, and deployment — the predecessor of Seedance 2.5.
- LongCat-Video and Wan 2.2: Two Open-Weight Video Generation Models Compared
A source-based comparison of LongCat-Video (13.6B DiT, 720p/30fps, up to 5-minute generations) and Wan 2.2 (Alibaba's open-weight MoE video model, 27B total/14B active, plus 5B consumer-GPU model). Both open licenses; covers architecture, duration, resolution, deployment, and licensing.
Sources
- LongCat-Video Technical Report (arXiv:2510.22200)
Primary sourcePublished 2025-10-24Accessed 2026-08-14
Technical report describing the 13.6B DiT architecture, coarse-to-fine generation, Block Sparse Attention, and multi-reward RLHF training.
- LongCat-Video GitHub Repository
Primary sourceAccessed 2026-08-14
Model weights, inference code, and license for LongCat-Video; supports T2V, I2V, and video continuation.
- LongCat-Video Project Page
Publisher documentationAccessed 2026-08-14
Publisher project page documenting 720p/30fps output, up to 5-minute long-form generation, and deployment guidance.
- Seedance 2.5 — Volcano Engine API launch (IT Home)
Third-partyPublished 2026-08-07Accessed 2026-08-14
Coverage of the August 7 API launch: native 30s output, up to 50 multimodal references, timestamp-precise editing, 10+ languages, and token-based pricing (42 yuan/M tokens with video input, 70 yuan/M without).
- Seedance 2.5 — ofox model page
Third-partyAccessed 2026-08-14
Specification page: 4-30s durations, 480p/720p resolutions, 6 aspect ratios, built-in synchronized audio, and per-second pricing from $0.11 (480p T2V) to $0.30 (720p V2V).
- Seedance 2.5 timeline and pricing — ai-indeed
Third-partyAccessed 2026-08-14
Timeline: FORCE 2026 announcement June 23, Jimeng consumer rollout July 6-31, Volcano Engine API open August 7. Documents the 180s ultra-long mode on Jimeng at 480p/720p with 30 reference limit.
Independent third-party disclosure
This page is published by an independent third-party site. It is not affiliated with, endorsed by, sponsored by, or operated by Meituan, LongCat, or any of their affiliates. The content summarizes publicly-available primary documentation and does not represent the views of any referenced organization.
Last reviewed: 2026-08-14