W&B Weave
For a limited time, the new W&B Inference service is included in your free tier. W&B Inference provides access to leading open-source foundation models via API and the Weave Playground.
Weights & Biases (W&B) Weave is a framework for tracking, experimenting with, evaluating, deploying, and improving LLM-based applications. Designed for flexibility and scalability, Weave supports every stage of your LLM application development workflow:
- Tracing & Monitoring: Track LLM calls and application logic to debug and analyze production systems.
- Systematic Iteration: Refine and iterate on prompts, datasets, and models.
- Experimentation: Experiment with different models and prompts in the LLM Playground.
- Evaluation: Use custom or pre-built scorers alongside our comparison tools to systematically assess and enhance application performance.
- Guardrails: Protect your application with pre- and post-safeguards for content moderation, prompt safety, and more.
Integrate Weave with your existing development stack via the:
Weave supports numerous LLM providers, local models, frameworks, protocols, and third-party services.
Get started
Choose your path to get started with Weave:
Recommended: Start with W&B Inference
Try Weave with W&B Inference - The fastest way to experience Weave
- No API keys needed - start building immediately
- Free credits included with all plans
- Learn tracing, evaluation, and monitoring with real models
- Access to live instances of powerful models like Llama, GPT-OSS, Qwen, and DeepSeek
Have your own API keys?
Track LLM Calls - Connect your existing LLM providers
- Works with OpenAI, Anthropic, and more
- Automatic tracing and cost tracking
- Perfect if you already have LLM infrastructure
Using TypeScript
TypeScript quickstart - Get started with Weave in TypeScript
Advanced guides
Learn more about advanced topics:
- Integrations: Use Weave with popular LLM providers, local models, frameworks, and third-party services.
- Cookbooks: Build with Weave using Python and TypeScript. Tutorials are available as interactive notebooks.
- W&B AI Academy: Build advanced RAG systems, improve LLM prompting, fine-tune LLMs, and more.