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+# CometAPI
+LiteLLM supports all AI models from [CometAPI](https://www.cometapi.com/). CometAPI provides access to 500+ AI models through a unified API interface, including cutting-edge models like GPT-5, Claude Opus 4.1, and various other state-of-the-art language models.
+
+## Authentication
+
+To use CometAPI models, you need to obtain an API key from [CometAPI Token Console](https://api.cometapi.com/console/token). CometAPI offers free tokens for new users - you can get your free API key instantly by registering.
+
+## Usage
+
+Set your CometAPI key as an environment variable and use the completion function:
+
+```python
+import os
+from litellm import completion
+
+# Set API key
+os.environ["COMETAPI_KEY"] = "your_comet_api_key_here"
+
+# Define messages
+messages = [{"content": "Hello, how are you?", "role": "user"}]
+
+# Method 1: Using environment variable (recommended)
+response = completion(
+    model="cometapi/gpt-5", 
+    messages=messages
+)
+
+print(response.choices[0].message.content)
+```
+
+### Alternative Usage - Explicit API Key
+
+You can also pass the API key explicitly:
+
+```python
+import os
+from litellm import completion
+
+# Define messages
+messages = [{"content": "Hello, how are you?", "role": "user"}]
+
+# Method 2: Explicitly passing API key
+response = completion(
+    model="cometapi/gpt-4o", 
+    messages=messages, 
+    api_key="your_comet_api_key_here"
+)
+
+print(response.choices[0].message.content)
+```
+
+## Usage - Streaming
+
+Just set `stream=True` when calling completion:
+
+```python
+import os
+from litellm import completion
+
+os.environ["COMETAPI_KEY"] = "your_comet_api_key_here"
+
+messages = [{"content": "Hello, how are you?", "role": "user"}]
+
+response = completion(
+    model="cometapi/gpt-5",
+    messages=messages,
+    stream=True
+)
+
+for chunk in response:
+    print(chunk.choices[0].delta.content or "", end="")
+```
+
+## Usage - Async Streaming
+
+For async streaming, use `acompletion`:
+
+```python
+from litellm import acompletion
+import asyncio, os, traceback
+
+async def completion_call():
+    try:
+        os.environ["COMETAPI_KEY"] = "your_comet_api_key_here"
+        
+        print("test acompletion + streaming")
+        response = await acompletion(
+            model="cometapi/chatgpt-4o-latest", 
+            messages=[{"content": "Hello, how are you?", "role": "user"}], 
+            stream=True
+        )
+        print(f"response: {response}")
+        async for chunk in response:
+            print(chunk)
+    except:
+        print(f"error occurred: {traceback.format_exc()}")
+        pass
+
+# Run the async function
+await completion_call()
+```
+
+## CometAPI Models
+
+CometAPI offers access to 500+ AI models through a unified API. Some popular models include:
+
+| Model Name | Function Call |
+|------------|---------------|
+| cometapi/gpt-5 | `completion('cometapi/gpt-5', messages)` |
+| cometapi/gpt-5-mini | `completion('cometapi/gpt-5-mini', messages)` |
+| cometapi/gpt-5-nano | `completion('cometapi/gpt-5-nano', messages)` |
+| cometapi/gpt-oss-20b | `completion('cometapi/gpt-oss-20b', messages)` |
+| cometapi/gpt-oss-120b | `completion('cometapi/gpt-oss-120b', messages)` |
+| cometapi/chatgpt-4o-latest | `completion('cometapi/chatgpt-4o-latest', messages)` |
+
+For a complete list of available models, visit the [CometAPI Models page](https://www.cometapi.com/model/).
+
+## Environment Variables
+
+| Variable | Description | Required |
+|----------|-------------|----------|
+| `COMETAPI_KEY` | Your CometAPI API key | Yes |
+
+## Error Handling
+
+```python
+import os
+from litellm import completion
+
+try:
+    os.environ["COMETAPI_KEY"] = "your_comet_api_key_here"
+    
+    messages = [{"content": "Hello, how are you?", "role": "user"}]
+    
+    response = completion(
+        model="cometapi/gpt-5",
+        messages=messages
+    )
+    
+    print(response.choices[0].message.content)
+    
+except Exception as e:
+    print(f"Error: {e}")
+```