# AI Provider Configuration

This guide explains how to configure different AI model providers for next-ai-draw-io.

## Quick Start

1. Copy `.env.example` to `.env.local`
2. Set your API key for your chosen provider
3. Set `AI_MODEL` to your desired model
4. Run `npm run dev`

## Supported Providers

### Doubao (ByteDance Volcengine)

> **Free tokens**: Register on the [Volcengine ARK platform](https://console.volcengine.com/ark/region:ark+cn-beijing/overview?briefPage=0&briefType=introduce&type=new&utm_campaign=doubao&utm_content=aidrawio&utm_medium=github&utm_source=coopensrc&utm_term=project) to get 500K free tokens for all models!

```bash
DOUBAO_API_KEY=your_api_key
AI_MODEL=doubao-seed-1-8-251215  # or other Doubao model
```

### Google Gemini

```bash
GOOGLE_GENERATIVE_AI_API_KEY=your_api_key
AI_MODEL=gemini-2.0-flash
```

Optional custom endpoint:

```bash
GOOGLE_BASE_URL=https://your-custom-endpoint
```

### OpenAI

```bash
OPENAI_API_KEY=your_api_key
AI_MODEL=gpt-4o
```

Optional custom endpoint (for OpenAI-compatible services):

```bash
OPENAI_BASE_URL=https://your-custom-endpoint/v1
```

### Anthropic

```bash
ANTHROPIC_API_KEY=your_api_key
AI_MODEL=claude-sonnet-4-5-20250514
```

Optional custom endpoint:

```bash
ANTHROPIC_BASE_URL=https://your-custom-endpoint
```

### DeepSeek

```bash
DEEPSEEK_API_KEY=your_api_key
AI_MODEL=deepseek-chat
```

Optional custom endpoint:

```bash
DEEPSEEK_BASE_URL=https://your-custom-endpoint
```

### SiliconFlow (OpenAI-compatible)

```bash
SILICONFLOW_API_KEY=your_api_key
AI_MODEL=deepseek-ai/DeepSeek-V3  # example; use any SiliconFlow model id
```

Optional custom endpoint (defaults to the recommended domain):

```bash
SILICONFLOW_BASE_URL=https://api.siliconflow.com/v1  # or https://api.siliconflow.cn/v1
```

### SGLang

```bash
SGLANG_API_KEY=your_api_key
AI_MODEL=your_model_id
```

Optional custom endpoint:

```bash
SGLANG_BASE_URL=https://your-custom-endpoint/v1
```

### Azure OpenAI

```bash
AZURE_API_KEY=your_api_key
AZURE_RESOURCE_NAME=your-resource-name  # Required: your Azure resource name
AI_MODEL=your-deployment-name
```

Or use a custom endpoint instead of resource name:

```bash
AZURE_API_KEY=your_api_key
AZURE_BASE_URL=https://your-resource.openai.azure.com  # Alternative to AZURE_RESOURCE_NAME
AI_MODEL=your-deployment-name
```

Optional reasoning configuration:

```bash
AZURE_REASONING_EFFORT=low      # Optional: low, medium, high
AZURE_REASONING_SUMMARY=detailed  # Optional: none, brief, detailed
```

### AWS Bedrock

```bash
AWS_REGION=us-west-2
AWS_ACCESS_KEY_ID=your_access_key_id
AWS_SECRET_ACCESS_KEY=your_secret_access_key
AI_MODEL=anthropic.claude-sonnet-4-5-20250514-v1:0
```

Note: On AWS (Lambda, EC2 with IAM role), credentials are automatically obtained from the IAM role.

### OpenRouter

```bash
OPENROUTER_API_KEY=your_api_key
AI_MODEL=anthropic/claude-sonnet-4
```

Optional custom endpoint:

```bash
OPENROUTER_BASE_URL=https://your-custom-endpoint
```

### Ollama (Local)

```bash
AI_PROVIDER=ollama
AI_MODEL=llama3.2
```

Optional custom URL:

```bash
OLLAMA_BASE_URL=http://localhost:11434
```

### Vercel AI Gateway

Vercel AI Gateway provides unified access to multiple AI providers through a single API key. This simplifies authentication and allows you to switch between providers without managing multiple API keys.

**Basic Usage (Vercel-hosted Gateway):**

```bash
AI_GATEWAY_API_KEY=your_gateway_api_key
AI_MODEL=openai/gpt-4o
```

**Custom Gateway URL (for local development or self-hosted Gateway):**

```bash
AI_GATEWAY_API_KEY=your_custom_api_key
AI_GATEWAY_BASE_URL=https://your-custom-gateway.com/v1/ai
AI_MODEL=openai/gpt-4o
```

Model format uses `provider/model` syntax:

-   `openai/gpt-4o` - OpenAI GPT-4o
-   `anthropic/claude-sonnet-4-5` - Anthropic Claude Sonnet 4.5
-   `google/gemini-2.0-flash` - Google Gemini 2.0 Flash

**Configuration notes:**

-   If `AI_GATEWAY_BASE_URL` is not set, the default Vercel Gateway URL (`https://ai-gateway.vercel.sh/v1/ai`) is used
-   Custom base URL is useful for:
    -   Local development with a custom Gateway instance
    -   Self-hosted AI Gateway deployments
    -   Enterprise proxy configurations
-   When using a custom base URL, you must also provide `AI_GATEWAY_API_KEY`

Get your API key from the [Vercel AI Gateway dashboard](https://vercel.com/ai-gateway).

## Auto-Detection

If you only configure **one** provider's API key, the system will automatically detect and use that provider. No need to set `AI_PROVIDER`.

If you configure **multiple** API keys, you must explicitly set `AI_PROVIDER`:

```bash
AI_PROVIDER=google  # or: openai, anthropic, deepseek, siliconflow, doubao, azure, bedrock, openrouter, ollama, gateway, sglang
```

## Model Capability Requirements

This task requires exceptionally strong model capabilities, as it involves generating long-form text with strict formatting constraints (draw.io XML).

**Recommended models**:

-   Claude Sonnet 4.5 / Opus 4.5

**Note on Ollama**: While Ollama is supported as a provider, it's generally not practical for this use case unless you're running high-capability models like DeepSeek R1 or Qwen3-235B locally.

## Temperature Setting

You can optionally configure the temperature via environment variable:

```bash
TEMPERATURE=0  # More deterministic output (recommended for diagrams)
```

**Important**: Leave `TEMPERATURE` unset for models that don't support temperature settings, such as:
- GPT-5.1 and other reasoning models
- Some specialized models

When unset, the model uses its default behavior.

## Recommendations

-   **Best experience**: Use models with vision support (GPT-4o, Claude, Gemini) for image-to-diagram features
-   **Budget-friendly**: DeepSeek offers competitive pricing
-   **Privacy**: Use Ollama for fully local, offline operation (requires powerful hardware)
-   **Flexibility**: OpenRouter provides access to many models through a single API
