Hy4 preview vs Music Videos by Mozart: Features, Pricing & Which Is Better (2026)
A side-by-side comparison of Hy4 preview and Music Videos by Mozart — 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.
Music Videos by Mozart
Mozart AI
AI-powered music generator for artists to create professional songs quickly with commercial rights included.
Key features
- Rapid Song Generation: Produces complete songs in seconds from user inputs like genre, mood, and tempo, accelerating creative workflows and demo production.
- Prompt-Based Composition: Lets users specify style, instrumentation, and vocal characteristics to guide the AI toward desired musical outcomes.
- Commercial Rights Included: Generated tracks come with commercial usage rights, enabling creators to monetize and distribute outputs without extra licensing steps.
- Export Options: Ability to export finished tracks in standard audio formats for immediate use in videos, streaming, or further production (stems/master exports supported where provided).
- Professional-Grade Output: Focused on creating polished, production-ready tracks suitable for artists, content creators, and small studios needing quick high-quality music.
- Customizable Styles and Presets: Offers style presets and adjustable parameters so users can tailor arrangements, instrumentation, and overall vibe of each track.
- Generate full songs and tracks using AI
- Create professional-quality tracks in seconds
- Commercial rights included with generated music
- Designed for artists and music creators
- Accessible via official website (web-based interface)
Best for
- Quick Demo Creation: Artists can generate full song demos to iterate on ideas fast without booking studio time.
- Content Production: Video creators and marketers can produce background music and theme tracks for videos, ads, and social posts with commercial-ready licensing.
- Indie Game and App Soundtracks: Small studios can create mood-appropriate tracks and loops for games or apps when bespoke scoring budgets are limited.
- Music for Licensing and Sync: Producers and composers can generate tracks to license or sync in media projects, benefiting from included commercial rights.
- Songwriting Assistance: Songwriters can use generated arrangements and hooks as starting points to develop full compositions with human refinement.
- Localized or Variant Versions: Create multiple stylistic variants of a song (different tempos, instrumentations, or moods) for A/B testing or regional releases.
- Quickly generate demos and full tracks for artists
- Produce background music and beats for content
- Create commercially-licensed music for release or licensing
- Accelerate songwriting and production workflows