> ## Documentation Index
> Fetch the complete documentation index at: https://docs.wandb.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Build AI agents, applications, and models

> Develop AI models and ship LLM applications with the W&B platform for experiment tracking, evaluation, and observability.

export const ProductCard = ({title, iconSrc, href, subtitle, children, iconSize = 24, className = ''}) => {
  const handleCardClick = e => {
    let target = e.target;
    while (target && target !== e.currentTarget) {
      if (target.tagName === 'A') return;
      target = target.parentElement;
    }
    if (href) {
      window.location.href = href;
    }
  };
  return <div className={`product-card group flex flex-col rounded-lg p-6 transition-all ${className}`} onClick={handleCardClick} style={{
    cursor: href ? 'pointer' : 'default'
  }}>
      {iconSrc && <span className="product-card-icon" aria-hidden="true" style={{
    display: 'block',
    width: `${iconSize}px`,
    height: `${iconSize}px`,
    backgroundColor: '#D4870D',
    WebkitMaskImage: `url(${iconSrc})`,
    maskImage: `url(${iconSrc})`,
    WebkitMaskRepeat: 'no-repeat',
    maskRepeat: 'no-repeat',
    WebkitMaskSize: 'contain',
    maskSize: 'contain',
    WebkitMaskPosition: 'left center',
    maskPosition: 'left center',
    marginBottom: '8px',
    lineHeight: 1
  }} />}

      <h2 className="product-card-title">
        {title}
      </h2>
      {subtitle && <h3 className="product-card-subtitle">
          {subtitle}
        </h3>}
      <div className="product-card-body leading-relaxed">
        {children}
      </div>
    </div>;
};

export const Banner = ({title, background, children, home}) => {
  useEffect(() => {
    if (home) {
      const header = document.querySelector("div#content-area > header#header");
      if (header) {
        header.style.display = "none";
      }
      const mdxContent = document.querySelector("div.mdx-content");
      if (mdxContent) {
        mdxContent.style.marginTop = "0";
      }
    }
    return () => {
      const header = document.querySelector("div#content-area > header#header");
      if (header) {
        header.style.display = "";
      }
      const mdxContent = document.querySelector("div.mdx-content");
      if (mdxContent) {
        mdxContent.style.marginTop = "";
      }
    };
  }, [home]);
  return <div className="relative w-full min-h-[200px] bg-gray-900 bg-cover bg-center bg-no-repeat rounded-lg overflow-hidden" style={{
    backgroundImage: `url('${background}')`
  }}>
      <div className="absolute inset-0 bg-black bg-opacity-40"></div>
      <div className="relative z-10 flex flex-col justify-center h-full px-8 py-12 text-white">
        <h2 className="banner-title font-serif text-2xl text-white font-normal mb-4 leading-tight mt-4">{title}</h2>
        <div className="banner-body text-gray-200 leading-relaxed">{children}</div>
      </div>
    </div>;
};

## Weights & Biases

<h3 className="home-h3">Develop AI models and ship LLM applications with the W\&B platform for experiment tracking, evaluation, and observability.</h3>

<div className="grid grid-cols-1 md:grid-cols-2 gap-4" style={{ marginTop: '2rem', marginBottom: '2rem' }}>
  <ProductCard title="W&B Models" iconSrc="icons/Models.svg" href="/models" subtitle="Develop AI models" iconSize={24}>
    Manage AI model development with experiment tracking, fine-tuning, reporting, hyperparameter sweeps, and a model registry for versioning and reproducibility.
  </ProductCard>

  <ProductCard title="W&B Weave" iconSrc="icons/Weave.svg" href="/weave" subtitle="Use AI models in your app" iconSize={24}>
    Manage AI models in your code with tracing, output evaluation, cost estimates, and a playground to compare large language models (LLMs) and settings.
  </ProductCard>
</div>

## Powered by CoreWeave

<h3 className="home-h3">Managed services that run on CoreWeave infrastructure.</h3>

<div className="grid grid-cols-1 md:grid-cols-3 gap-4" style={{ marginTop: '2rem' }}>
  <ProductCard title="Serverless Inference" iconSrc="icons/Inference.svg" href="/inference" subtitle="Access foundation models" iconSize={24}>
    Access leading open-source foundation models through an OpenAI-compatible API, with usage tracking and Weave integration for tracing and evaluation.
  </ProductCard>

  <ProductCard title="Serverless Training" iconSrc="icons/Training.svg" href="/serverless-training" subtitle="Post-train and fine-tune models" iconSize={24}>
    Now in public preview. Post-train and fine-tune LLMs with Serverless RL and Serverless SFT, managed GPU infrastructure, ART and RULER integration, and auto-scaling for multi-turn agentic tasks.
  </ProductCard>

  <ProductCard title="Serverless Sandboxes" iconSrc="icons/cropped-sdk.svg" href="/sandboxes" subtitle="Run code in isolated environments" iconSize={24}>
    Now in private preview by invitation. Run code in isolated compute environments with lifecycle management, secrets handling, file access, and a Python SDK.
  </ProductCard>
</div>