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

# Providers

> Built-in TypeScript providers, environment variables, custom endpoints, and provider registry APIs.

## Built-in Providers

| Provider     | `provider` value | Environment variable  |
| ------------ | ---------------- | --------------------- |
| OpenAI       | `openai`         | `OPENAI_API_KEY`      |
| Anthropic    | `anthropic`      | `ANTHROPIC_API_KEY`   |
| Groq         | `groq`           | `GROQ_API_KEY`        |
| Together AI  | `together`       | `TOGETHER_API_KEY`    |
| Hugging Face | `huggingface`    | `HUGGINGFACE_API_KEY` |
| OpenRouter   | `openrouter`     | `OPENROUTER_API_KEY`  |
| Ollama       | `ollama`         | Not required          |
| vLLM         | `vllm`           | Depends on deployment |

Vercel AI adapters add Azure, Bedrock, Cohere, DeepSeek, Fireworks, Google, Mistral, Perplexity, Vertex, xAI, and other provider identifiers.

## Model Configuration

```typescript theme={null}
const model = {
  name: 'gpt-4o-mini',
  provider: 'openai' as const,
  cost: 0.00015,
  apiKey: process.env.OPENAI_API_KEY,
  baseUrl: 'https://api.openai.com/v1',
  maxTokens: 1000,
  temperature: 0.2,
};
```

`cost` is the configured cost per 1,000 tokens used for cascade ordering. Provider-reported usage and built-in pricing are used when the provider supports detailed cost calculation.

## Local Endpoints

```typescript theme={null}
const local = new CascadeAgent({
  models: [
    {
      name: 'qwen2.5:7b',
      provider: 'ollama',
      cost: 0,
      baseUrl: 'http://localhost:11434',
    },
  ],
});
```

## Registry

```typescript theme={null}
import { getAvailableProviders, providerRegistry } from '@cascadeflow/core';

console.log(getAvailableProviders());
console.log(providerRegistry.has('openai'));
```

The `Provider` interface contains `generate()`, optional `stream()`, `calculateCost()`, and `isAvailable()` methods. Register a custom provider class when the built-in providers do not cover your endpoint.

See [Providers and Presets](/developers/providers-and-presets) for configuration patterns.