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

# Welcome to Observ

> Observ is a unified LLM completion gateway with intelligent semantic caching (Recall), API key management, usage analytics, and comprehensive tracing

<CardGroup cols={2}>
  <Card title="Trace" icon="chart-line" color="#a855f7">
    Complete observability with environment isolation, session tracking, and
    custom metadata
  </Card>

  <Card title="Recall" icon="brain" color="#a855f7">
    Scalable semantic caching for significant cost and latency savings at scale
  </Card>

  <Card title="Resilience (Coming Soon)" icon="shield" color="#a855f7">
    Automatic model fallbacks for improved reliability
  </Card>

  <Card title="Adapt (Coming Soon)" icon="wand-magic-sparkles" color="#a855f7">
    Smart model selection and cost optimization
  </Card>
</CardGroup>

## Supported Providers

Observ works seamlessly with all major AI providers:

* **Anthropic** - Claude models including Opus 4.5
* **OpenAI** - All GPT models including 5.1
* **Mistral** - Mistral Large and other Mistral models
* **Google** - Gemini models (Python SDK)
* **xAI** - Grok models
* **OpenRouter** - Access to 100+ models through a single interface

<Info>
  With Vercel AI SDK integration, you can access **25+ providers** through a
  unified API.
</Info>

## Two Ways to Use Observ

<CardGroup cols={2}>
  <Card title="Vercel AI SDK" icon="zap" href="/vercel-ai/overview">
    Use Vercel AI SDK's unified API for seamless multi-provider support with
    automatic provider switching
  </Card>

  <Card title="Provider SDKs" icon="code" href="/provider-sdks/overview">
    Wrap your existing provider SDK clients (Anthropic, OpenAI, etc.) directly
    for drop-in observability
  </Card>
</CardGroup>

## Key Features

### Session Tracking

Group related LLM calls together using session IDs - perfect for tracking multi-turn conversations and analyzing user workflows.

<Card title="Learn about Sessions" icon="users" href="/features/sessions">
  Track conversation threads and multi-step workflows
</Card>

### Custom Metadata

Attach custom key-value pairs to traces for powerful filtering, debugging, and analytics in your dashboard.

<Card title="Learn about Metadata" icon="tag" href="/features/metadata">
  Add context to your traces with custom metadata
</Card>

### Recall

Enable intelligent caching with `recall: true` to automatically cache similar prompts and reduce token costs by up to 85% and achieve up to 360x latency reduction.

## Next Steps

<CardGroup cols={2}>
  <Card title="Quick Start" icon="rocket" href="/quickstart">
    Get started in under 5 minutes
  </Card>

  <Card title="Vercel AI SDK" icon="zap" href="/vercel-ai/overview">
    Use with Vercel AI SDK for 25+ providers
  </Card>

  <Card title="Provider SDKs" icon="code" href="/provider-sdks/overview">
    Wrap your existing SDK clients
  </Card>

  <Card title="Dashboard" icon="gauge" href="https://observ.ai/dashboard">
    View your traces and analytics
  </Card>
</CardGroup>