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

# Other SDKs

> Use the ngrok AI Gateway with any SDK that supports OpenAI API or Anthropic Claude API format.

<Note>
  **Prerequisite**: Complete the [Quickstart](/ai-gateway/quickstart) to get an [access key](/ai-gateway/concepts/access-keys). All requests go to `https://gateway.ngrok.ai`.
</Note>

The AI Gateway works with any SDK or HTTP client that supports OpenAI API or Anthropic Claude API format. If your language or framework isn't covered in the dedicated guides, you can still use the gateway.

## Requirements

For any SDK or client to work with the AI Gateway, it must:

1. Support the OpenAI API or Anthropic Claude API format
2. Allow customizing the base URL / endpoint
3. Send requests with proper authorization headers (for OpenAI API, `Authorization`; for Anthropic Claude API, `x-api-key`)

## Authentication

Pass your [access key](/ai-gateway/concepts/access-keys) (`ng-xxxxx-g1-xxxxx`) as the API key. The AI Gateway injects upstream provider credentials from your [access key configuration](/ai-gateway/guides/access-key-configurations).

## cURL

For testing or shell scripts:

<CodeGroup>
  ```bash OpenAI API theme={null}
  curl https://gateway.ngrok.ai/v1/chat/completions \
    -H "Content-Type: application/json" \
    -H "Authorization: Bearer ng-xxxxx-g1-xxxxx" \  # Your access key
    -d '{
      "model": "gpt-4o",
      "messages": [{"role": "user", "content": "Hello!"}]
    }'
  ```

  ```bash Anthropic Claude API theme={null}
  curl https://gateway.ngrok.ai/v1/messages \
    -H "Content-Type: application/json" \
    -H "x-api-key: ng-xxxxx-g1-xxxxx" \  # Your access key
    -H "anthropic-version: 2023-06-01" \
    -d '{
      "model": "claude-sonnet-4-20250514",
      "max_tokens": 1024,
      "messages": [{"role": "user", "content": "Hello!"}]
    }'
  ```
</CodeGroup>

## HTTP request format

Any HTTP client can call the AI Gateway:

<CodeGroup>
  ```http OpenAI API theme={null}
  POST /v1/chat/completions HTTP/1.1
  Host: gateway.ngrok.ai
  Content-Type: application/json
  Authorization: Bearer ng-xxxxx-g1-xxxxx

  {
    "model": "gpt-4o",
    "messages": [
      {"role": "user", "content": "Hello!"}
    ]
  }
  ```

  ```http Anthropic Claude API theme={null}
  POST /v1/messages HTTP/1.1
  Host: gateway.ngrok.ai
  Content-Type: application/json
  x-api-key: ng-xxxxx-g1-xxxxx
  anthropic-version: 2023-06-01

  {
    "model": "claude-sonnet-4-20250514",
    "max_tokens": 1024,
    "messages": [
      {"role": "user", "content": "Hello!"}
    ]
  }
  ```
</CodeGroup>

## Using provider prefixes

All clients support routing to specific providers using model prefixes:

```
# OpenAI
model: "openai:gpt-4o"

# Anthropic
model: "anthropic:claude-3-5-sonnet-latest"

# Self-hosted
model: "ollama:llama3.2"
```

## Supported endpoints

The AI Gateway supports these endpoints:

| Endpoint               | API Format | Description           |
| ---------------------- | ---------- | --------------------- |
| `/v1/chat/completions` | OpenAI     | Chat completions      |
| `/v1/completions`      | OpenAI     | Legacy completions    |
| `/v1/embeddings`       | OpenAI     | Text embeddings       |
| `/v1/models`           | OpenAI     | List available models |
| `/v1/messages`         | Anthropic  | Messages              |

## Next steps

* [OpenAI SDK](/ai-gateway/sdks/openai) - Official Python, TypeScript, Go, Java, and .NET guide
* [Vercel AI SDK](/ai-gateway/sdks/vercel-ai-sdk) - For Next.js and React applications
* [LangChain](/ai-gateway/sdks/langchain) - For LangChain applications
* [Choose a model](/ai-gateway/guides/model-selection-strategies)
* [Configure fallback models](/ai-gateway/guides/configure-fallback-models)