Fireworks AI vs Hy4 preview: Features, Pricing & Which Is Better (2026)
A side-by-side comparison of Fireworks AI and Hy4 preview — features, pricing, and ideal use cases — to help you decide which AI tool fits your workflow.
Fireworks AI
Fireworks AI
High-performance serverless inference and deployment platform for open-source LLMs and image models with fast inference and built-in fine-tuning.
Key features
- Blazing-Fast Inference: Optimized serverless runtime for low-latency inference of open-source LLMs and image models, designed to reduce response times for production workloads.
- Serverless Model Hosting: Host and run models via a cloud API without managing servers, autoscaling, or instance provisioning — simplifying deployment and operations.
- Fine-Tuning Support: Built-in workflows and tooling to fine-tune open-source models and deploy the tuned checkpoints with no additional deployment cost (per official claim).
- Hugging Face Integration: Supported as an Inference Provider on the Hugging Face Hub, enabling serverless inference directly from model pages and seamless hub interoperability.
- Developer SDKs and Plugins: Client libraries, third-party plugins (e.g., llm-fireworks), and example repositories to integrate Fireworks into applications and ML pipelines quickly.
- Cookbook & Examples: Public cookbook, Jupyter notebooks, and showcase projects that provide recipes for building, deploying, RAG systems, function-calling, and agentic workflows.
- Cloud API & Platform Tools: REST/HTTP API and developer tooling for model lifecycle operations — upload, manage, and invoke models programmatically.
- Cloud API for model hosting and inference (no infrastructure management)
- Serverless, low-latency inference optimized for generative models
- Support for open-source LLMs and image models
- Fine-tune and deploy models (advertised at no additional cost)
- Hugging Face Inference Provider integration (serverless inference on HF Hub)
- SDKs/plugins and community integrations (e.g., llm-fireworks plugin)
- Cookbook repository with recipes, Jupyter notebooks, and sample apps
- Docker and local development support and examples
- Showcase projects and example workflows (RAG, function-calling, agentic systems)
Best for
- Low-latency production inference: Serve open-source LLMs and image models in production apps that require fast, serverless responses without managing infrastructure.
- Custom model fine-tuning and deployment: Fine-tune foundation models on proprietary data and deploy the tuned model through Fireworks’ hosting and API.
- Hugging Face model pages inference: Run serverless inference directly on model hub pages by using Fireworks as a supported inference provider.
- Prototype-to-production workflows: Use the cookbook examples and SDKs to prototype generative applications, then scale them to production with managed hosting and autoscaling.
- RAG and agentic systems: Build retrieval-augmented generation pipelines and agentic systems using provided recipes, function-calling examples, and integration resources.
- Developer integrations and plugins: Embed model inference into applications via the Fireworks cloud API or community plugins (e.g., llm-fireworks) for quick application integration.
- Production-grade model inference for apps and APIs requiring low-latency generative outputs
- Fine-tuning open-source LLMs and deploying custom models without managing servers
- Image generation and multimodal model hosting
- Retrieval-augmented generation (RAG) pipelines and function-calling workflows
- Rapid prototyping using provided cookbooks and Jupyter notebooks
- Integrating model inference into existing platforms via API or Hugging Face provider
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.