Hy4 preview vs Z Image Turbo: Features, Pricing & Which Is Better (2026)
A side-by-side comparison of Hy4 preview and Z Image Turbo — 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.
Z Image Turbo
Tongyi-MAI (Alibaba)
A 6B-parameter, efficient text-to-image model (Z-Image-Turbo) optimized for few-step sampling, photorealism, and English–Chinese text rendering.
Key features
- Single-Stream Diffusion Transformer (S3-DiT): Uses a scalable single-stream DiT architecture that enables unified image generation with improved efficiency compared to multi-stage pipelines.
- Few-Step Sampling (8 NFEs): Distilled to run high-quality sampling with only ~8 Number of Function Evaluations by default, enabling fast, low-latency generation suitable for interactive applications.
- 6B Parameters Optimized for 16GB VRAM: Model size and precision optimizations (bfloat16 / FP8-ready) allow practical local inference on 16 GB consumer GPUs and sub-second latency on enterprise H800-class hardware.
- Bilingual Text Rendering: Trained and conditioned to accurately render and follow prompts in both English and Chinese, improving fidelity of embedded text and multilingual layout tasks.
- Qwen 4B Conditioning & Flux VAE: Integrates the Qwen 4B text encoder for stronger prompt conditioning and a Flux autoencoder (VAE) for high-fidelity image reconstruction.
- Distillation and Instruction Adherence (DMDR): Leveraged distillation techniques (DMDR / DMD + RL) to compress model capabilities, boost instruction-following behavior, and preserve photorealistic quality.
- Low-Precision & Quantization Support: Works with bfloat16 and community FP8 quantizations, and community ports provide FP8/quantized variants for memory and speed gains.
- Ecosystem Integrations: Available in Diffusers-compatible pipelines, Hugging Face model hub entries, ComfyUI workflows, and multiple community CLIs for MPS/CUDA/CPU inference.
- 6B-parameter model architecture (Z-Image family)
- Single-stream diffusion transformer (S3-DiT) backbone
- Default inference with 8 NFEs (few-step sampling)
- Qwen 4B text encoder for conditioning
- Flux VAE for image encoding/decoding
- Distilled training using DMDR (DMD + RL)
- Optimized for bfloat16 and FP8; quantized FP8 builds available
- Sub-second inference latency on H800-class GPUs
- Fits within 16GB VRAM and supports lower-VRAM consumer setups (8GB+ with offload)
- Cross-platform runtime: Apple MPS (bfloat16), CUDA (bfloat16), and CPU (float32) paths
- Integration with Hugging Face diffusers and ComfyUI pipelines
- CLI tooling, example web frontend, and Colab notebooks for quick start
- Optional performance flags: torch.compile, FlashAttention 2/3, CPU offload
- LoRA support and community-provided LoRAs for style/color enhancements
Best for
- E-commerce Visuals: Rapidly generate photorealistic product renders and lifestyle images with bilingual captions or embedded text for multilingual catalogs and marketing.
- Interactive Design Iteration: Designers and artists using local 16 GB GPUs can produce near-real-time concept images, iterate prompts, and produce high-quality assets without heavy cloud costs.
- Low-Latency Web Services: Deploy model-backed image generation endpoints with fast few-step sampling to provide interactive image generation in web apps and chat interfaces.
- Multilingual Content Creation: Create marketing creatives, posters, or social media images requiring precise Chinese or English text rendering within the generated images.
- Research & Benchmarking: Use as an open foundation model for studying distillation, few-step diffusion performance, quantization effects (bfloat16/FP8), and instruction adherence comparisons.
- Local/Edge Inference: Run on Apple Silicon (MPS), CUDA, or CPU with community tools and lightweight CLIs for private, offline image generation workflows.
- Photorealistic text-to-image generation for creative and commercial assets
- Rendering accurate bilingual (English/Chinese) text within generated imagery
- Low-latency server inference on H800-class GPUs for image generation endpoints
- Local deployment on consumer GPUs or Apple Silicon for prototyping and content creation
- Integration into ComfyUI/diffusers pipelines for workflow automation and custom pipelines
- Experimentation with quantized models (FP8) to reduce memory and accelerate inference
- Fine-tuning/LoRA augmentation for stylistic or color adjustments