Hy4 preview vs Koyal: Features, Pricing & Which Is Better (2026)
A side-by-side comparison of Hy4 preview and Koyal — 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.
Koyal
Koyal
Converts audio or scripts into end-to-end cinematic videos with generated characters, settings, storylines and animations.
Key features
- End-to-End Audio-to-Video: Converts raw audio or written scripts into fully rendered cinematic videos without manual storyboard assembly, handling scene sequencing, camera framing and transitions.
- Personalized Character Generation: Creates custom characters, including user likenesses, with consistent appearances and behaviors across scenes to maintain narrative continuity.
- Automated Setting and Scene Design: Generates coherent environments and background elements matched to the story tone and audio cues, ensuring visual consistency across sequences.
- Agentic Filmmaking Pipeline: Orchestrates multi-step production tasks (scripting, casting, scene planning, animation) automatically while exposing controls for user-driven creative adjustments.
- Storyline and Dialogue Alignment: Produces story structure, pacing and visual beats that align with audio content and dialogue to create cinematic narrative flow.
- Fast Iteration and Rendering: Designed for quick turnaround, enabling users to produce animated film clips and prototypes within minutes rather than hours or days.
- Safety and Content Controls: Incorporates safeguards and content moderation to support safer AI-generated video creation (as highlighted by the developer and partner coverage).
- Convert audio or script into end-to-end cinematic video automatically
- Generate consistent storylines, settings, and characters in one workflow
- Create personalized characters/avatars (including representations of the user)
- Automated scene and animation generation to produce finished clips
- Web-based platform with account sign-up and beta access
- Safety-focused generation tools and creative control for users
Best for
- Podcast-to-Video Conversion: Transform full podcast episodes or clips into cinematic video shorts with animated scenes and characters for social sharing.
- Personalized Storytelling: Generate short films or narrative videos that include a user's likeness or custom characters for gifts, marketing, or social content.
- Marketing and Ad Production: Rapidly produce branded video ads or promotional stories from a script or audio brief without hiring a production crew.
- Prototype Filmmaking: Quickly visualise scripts and story ideas as animated proofs-of-concept to pitch to stakeholders or iterate on story beats.
- Educational Content Creation: Convert lectures or audio lessons into engaging animated videos that illustrate concepts with contextual scenes and characters.
- Content Repurposing for Creators: Repurpose existing audio content (interviews, voiceovers) into multiple visual formats tailored for different platforms.
- Turn podcast episodes or voice recordings into cinematic visual stories
- Rapid prototyping of film scenes and storyboards from scripts or audio
- Create personalized social videos and marketing content with custom characters
- Educational or explainer videos generated from narrated scripts
- Generate animated character-driven short films or vignettes from audio