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

# AI API Directory

> Complete guide to AI model providers and API registration

## Choosing a provider

Consider these factors:

**Budget:**

* **Tight budget** → DeepSeek, Google Gemini Flash, or [free options](./free-api-keys)
* **Moderate budget** → GPT-4, Claude Haiku
* **Premium quality** → GPT-5, Claude Sonnet, Claude Opus

**Use case:**

* **General writing** → OpenAI GPT-5.2
* **Strategic planning** → Claude Sonnet-4.5
* **Chinese content** → Zhipu GLM-5, DeepSeek-V3.2
* **Speed priority** → Google Gemini 3 Flash

## Popular AI providers

<Note>
  Prices listed here are subject to change. Please refer to the official provider for the most accurate pricing.
</Note>

### OpenAI

<Card title="OpenAI Platform" icon="openai" href="https://platform.openai.com">
  GPT-5, GPT-4, and more GPT models
</Card>

**Pricing:** Pay-as-you-go, starts at \$0.03/1K tokens for GPT-3.5

**How to register:**

<Steps>
  <Step title="Create account">
    Visit [platform.openai.com](https://platform.openai.com) and sign up
  </Step>

  <Step title="Add payment method">
    Navigate to Billing and add a payment method
  </Step>

  <Step title="Generate API key">
    Go to API keys section and create a new key
  </Step>
</Steps>

### Anthropic

<Card title="Anthropic Console" icon="microchip" href="https://console.anthropic.com">
  Claude Sonnet, Opus, and Haiku models
</Card>

**Pricing:** Pay-as-you-go, starts at \$3/million tokens for Haiku

### Google AI

<Card title="Google AI Studio" icon="google" href="https://aistudio.google.com">
  Gemini Pro and Flash models
</Card>

**Pricing:** Free tier available, Pro starts at \$0.35/million tokens

### DeepSeek

<Card title="DeepSeek Platform" icon="brain" href="https://platform.deepseek.com">
  DeepSeek V3 and R1 models
</Card>

**Pricing:** Very affordable, starts at ¥0.1/million tokens

### Zhipu AI

<Card title="Zhipu AI Open Platform" icon="language" href="https://open.bigmodel.cn">
  GLM-4, GLM-5 models
</Card>

**Pricing:** Competitive rates for Chinese market

## API aggregators

Aggregators provide access to multiple models through a single API key:

| Aggregator      | Models Available   | Benefits               |
| --------------- | ------------------ | ---------------------- |
| **OpenRouter**  | 100+ models        | One key for all models |
| **Together AI** | Open-source models | Self-hosted options    |
| **Replicate**   | Community models   | Wide variety           |

<Tip>
  Aggregators simplify managing multiple providers but may add a small markup.
</Tip>

## Free resources

Get started without spending money:

<Card title="Free API keys" icon="gift" href="./free-api-keys">
  Community resources, free tiers, and trial credits
</Card>

## Configuration help

After getting your API key, configure it in SoloEnt:

<Card title="API configuration guide" icon="key" href="../quickstart/api-configuration">
  Step-by-step setup instructions
</Card>

## Next steps

<CardGroup cols={2}>
  <Card title="Configure API keys" icon="key" href="../quickstart/api-configuration">
    Set up your chosen provider
  </Card>

  <Card title="Free API keys" icon="gift" href="./free-api-keys">
    Start with free options
  </Card>

  <Card title="Start writing" icon="pen-to-square" href="../tips/create-project">
    Create your first project
  </Card>
</CardGroup>