Hy4 preview vs UniVideo: Features, Pricing & Which Is Better (2026)
A side-by-side comparison of Hy4 preview and UniVideo — features, pricing, and ideal use cases — to help you decide which AI tool fits your workflow.
Hy4 preview
Tencent
Tencent's open-weight Hy4 preview, a 770B-parameter Mixture-of-Experts model with 49B active parameters and a 1M-token context window.
Key features
- 770B Mixture-of-Experts Architecture: Holds 770 billion total parameters while activating only 49 billion per token, so capacity scales without proportional inference cost.
- 1M-Token Context Window: Accepts inputs exceeding one million tokens, allowing whole codebases, long document sets or extended agent traces in a single prompt.
- Apache 2.0 Open Weights: Released under a permissive licence that allows commercial use, modification and redistribution with no separate agreement.
- Productivity Task Focus: Tuned for real-world coding, office work and scientific research rather than narrow benchmark optimisation.
- Multi-Product Availability: Accessible globally through Tencent's WorkBuddy, CodeBuddy, Yuanbao and ima applications in addition to the raw weights.
- API Access via TokenHub and OpenRouter: Can be called through Tencent Cloud TokenHub or OpenRouter for teams that prefer hosted inference over self-hosting.
Best for
- Whole-Repository Code Work: Load an entire codebase into the million-token context to reason about refactors and cross-file dependencies at once.
- Long-Horizon Agent Tasks: Drive multi-step agent workflows where the full history of tool calls and intermediate results must stay in context.
- Self-Hosted Deployment: Run a frontier-scale open-weight model on private infrastructure where data cannot leave the organisation.
- Scientific Literature Analysis: Ingest large collections of papers or experimental logs and synthesise findings without chunking the input.
- Office Document Processing: Summarise, draft and restructure long reports, contracts and spreadsheets in enterprise workflows.
- Commercial Fine-Tuning: Adapt the weights for a proprietary product under the Apache 2.0 licence without negotiating a model licence.
UniVideo
Kling Team (Kuaishou Technology)
Unified video model for understanding, high-fidelity generation, and precise free-form editing via a dual-stream architecture.
Key features
- Dual-Stream Architecture: Combines a Multimodal Large Language Model (MLLM) for understanding instructions with a Multimodal DiT (MMDiT) generator to decouple instruction parsing from video synthesis and preserve visual-temporal consistency.
- Unified Instruction Paradigm: Unifies diverse tasks (text/image-to-video generation, in-context generation, and editing) under a single multimodal instruction format so users can compose complex operations in one prompt.
- In-Context Video Generation: Supports generation conditioned on example frames or short video contexts to produce temporally coherent continuations or variant clips that follow provided examples.
- Free-Form Video Editing: Performs precise edits such as changing materials, green-screening characters, and localized modifications by interpreting free-form multimodal instructions, leveraging transfer from large-scale image editing data.
- Task Composition: Enables combining capabilities (e.g., editing + style transfer) within a single instruction, executing multiple editing and generation steps coherently without separate models.
- Visual-Prompt-Based Generation: Accepts visual prompts (images or video frames) alongside text to guide content, composition, and style of produced videos.
- Joint Multi-Task Training & Checkpoint Variants: Trained jointly across multiple video/image/text tasks and released with checkpoint variants and inference scripts to support different input modalities and research use cases.
- Dual-stream architecture: Multimodal Large Language Model (MLLM) for instruction understanding + Multimodal DiT (MMDiT) for video generation
- Unified capabilities: text-to-video, image-to-video, visual-prompt-based generation, in-context video generation and editing, free-form editing
- Task composition: combine editing, style transfer, and other operations via single multimodal instructions
- Cross-modal transfer: editing capability transferred from image editing datasets to video editing without explicit video-edit training for some tasks
- Model variants / checkpoints: two released variants (Variant 1: img/video/text -> MLLM -> last layer hidden -> MMDiT; Variant 2: img/video/text/queries -> MLLM -> text+queries hidden -> MMDiT)
- Open-source release: code, checkpoints, inference scripts on GitHub and model card on Hugging Face
- Inference utilities: provided demo/inference scripts for running tasks and demos
- Technical stack & tested environment: Python 3.11; PyTorch 2.4.1 with CUDA 12.1; diffusers 0.34.0; transformers 4.51.3; recommended conda environment (environment.yml provided)
Best for
- Text-to-Video Content Creation: Generate short, coherent video clips from textual descriptions for prototyping, creative content, or concept footage.
- In-Context Video Synthesis: Produce video continuations or alternate takes conditioned on example frames or short clips for storyboarding and iterative creative workflows.
- Free-Form Video Editing for VFX: Apply complex edits such as green-screening, material replacement, or object modification across frames while preserving temporal consistency for visual effects and post-production.
- Style Transfer and Composition: Combine style transfer with edits (e.g., recoloring plus material change) in a single instruction to create stylized variations of existing footage.
- Research and Benchmarking: Serve as a baseline and toolkit for academic and industrial research into unified multimodal video models, enabling reproducible experiments with provided code and checkpoints.
- Visual-Prompted Prototyping: Use image or frame prompts to guide generation for rapid prototyping of scene variations, product demos, or UX motion concepts.
- Text-to-video and image-to-video generation for creative content
- In-context video generation using example videos as prompts
- Free-form and region-based video editing (green-screening, material/texture changes)
- Style transfer and composition of multiple editing operations in a single instruction
- Research and development: baseline for multimodal video model research and further model fine-tuning
- Prototyping video-based multimodal applications with provided inference scripts and checkpoints