Add Z AI provider

docs/providers/zai.md

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+---
+sidebar_label: Z AI
+description: Configure Z.ai's GLM-4.5 AI models in Roo Code. Access cutting-edge open-source language models with dual regional support and competitive pricing.
+keywords:
+  - z ai
+  - zai
+  - zhipu ai
+  - glm-4.5
+  - roo code
+  - api provider
+  - chinese ai
+  - language models
+  - open source ai
+  - mixture of experts
+image: /img/social-share.jpg
+---
+
+# Using Z AI With Roo Code
+
+Z.ai (formerly Zhipu AI) is a leading Chinese AI company that develops cutting-edge foundation models. Their GLM-4.5 series represents breakthrough technology in open-source AI, featuring Mixture of Experts (MoE) architecture with native agent capabilities and exceptional performance across reasoning, coding, and intelligent agent tasks.
+
+**Website:** [https://z.ai/](https://z.ai/)
+
+---
+
+## Getting an API Key
+
+Z.ai provides two regional endpoints to serve users globally:
+
+### International Users
+1. **Access Z.ai Platform:** Visit [https://chat.z.ai/](https://chat.z.ai/)
+2. **Register/Sign In:** Create an account or sign in to the platform
+3. **Navigate to API:** Access the API section to generate your key
+4. **Copy the Key:** **Important:** Copy and securely store your API key immediately
+
+### China Users  
+1. **Access Zhipu Platform:** Visit [https://open.bigmodel.cn/dev/api](https://open.bigmodel.cn/dev/api)
+2. **Register/Sign In:** Create an account on the Zhipu AI Open Platform
+3. **Generate API Key:** Create a new API key in the developer console
+4. **Copy the Key:** **Important:** Store your API key securely for future use
+
+---
+
+## Supported Models
+
+Roo Code supports the complete GLM-4.5 series:
+
+### GLM-4.5 Series
+* `glm-4.5` (Default) - Advanced reasoning and coding with 355B total parameters (32B active)
+* `glm-4.5-air` - Efficient model with 106B total parameters (12B active)
+
+### Model Features
+All GLM-4.5 models include:
+- **Context Window:** 131,072 tokens
+- **Max Output:** 98,304 tokens  
+- **Prompt Caching:** Supported with significant cost savings
+- **Agent Capabilities:** Native reasoning, planning, and tool usage
+- **Hybrid Reasoning:** Both thinking and non-thinking modes
+- **Multi-Token Prediction:** Up to 8x faster inference
+
+### Pricing
+Z.ai offers industry-leading competitive pricing:
+- **Input tokens:** From $0.11 per million tokens
+- **Output tokens:** From $0.28 per million tokens
+- **Cache reads:** Significant discounts on cached content
+
+---
+
+## Regional Configuration
+
+Z.ai automatically selects the optimal endpoint based on your configuration:
+
+### International Endpoint
+- **Base URL:** `https://api.z.ai/api/paas/v4`
+- **Models:** International pricing tier
+- **Recommended for:** Users outside mainland China
+
+### China Endpoint  
+- **Base URL:** `https://open.bigmodel.cn/api/paas/v4`
+- **Models:** Mainland China pricing tier
+- **Recommended for:** Users in mainland China
+
+---
+
+## Configuration in Roo Code
+
+1. **Open Roo Code Settings:** Click the gear icon (<Codicon name="gear" />) in the Roo Code panel.
+2. **Select Provider:** Choose "Z AI" from the "API Provider" dropdown.
+3. **Choose Endpoint:** Select your Z AI entrypoint:
+   - **api.z.ai** for international users
+   - **open.bigmodel.cn** for China users
+4. **Enter API Key:** Paste your Z AI API key into the "Z AI API Key" field.
+5. **Select Model:** Choose your desired GLM-4.5 model from the dropdown.
+
+---
+
+## Advanced Features
+
+### Agent-Native Capabilities
+GLM-4.5 models feature built-in agent capabilities:
+- **Multi-step reasoning:** Complex problem decomposition and planning
+- **Tool integration:** Native API and function calling support
+- **Workflow management:** End-to-end task execution
+- **Data visualization:** Complex chart and diagram generation
+
+### Performance Optimizations
+- **Speculative Decoding:** Up to 8x faster inference speeds
+- **Multi-Token Prediction:** Generate 100+ tokens per second
+- **Mixture of Experts:** Efficient parameter utilization
+- **Hardware Efficiency:** Optimized for both cloud and edge deployment
+
+---
+
+## Example Usage
+
+Here's a sample API call structure as referenced in the [Z.ai documentation](https://docs.z.ai/guides/overview/quick-start):
+
+```bash
+curl -X POST "https://api.z.ai/api/paas/v4/chat/completions" \
+-H "Content-Type: application/json" \
+-H "Authorization: Bearer YOUR_API_KEY" \
+-d '{
+    "model": "glm-4.5",
+    "messages": [
+        {
+            "role": "system", 
+            "content": "You are a helpful AI assistant."
+        },
+        {
+            "role": "user",
+            "content": "Hello, please introduce yourself."
+        }
+    ],
+    "temperature": 0.7,
+    "top_p": 0.8
+}'
+```
+
+**Note:** Roo Code handles all API communication automatically once configured.