Document how to use Cohere models through the OpenAI provider.

docs/user-guide/concepts/model-providers/cohere.md

@@ -0,0 +1,54 @@
+# Cohere
+
+[Cohere](https://cohere.com/) brings you cutting-edge multilingual models, advanced retrieval, and an AI workspace tailored for the modern enterprise — all within a single, secure platform. 
+
+## Installation
+
+The Strands Agents SDK provides access to Cohere models through the OpenAI compatiblity layer, configured as an optional dependency. To install, run:
+
+```bash
+pip install 'strands-agents[openai]'
+```
+
+## Usage
+
+After installing `openai`, you can import and initialize Cohere models as follows:
+
+```python
+from strands import Agent
+from strands.models.openai import OpenAIModel
+from strands_tools import calculator
+
+model = OpenAIModel(
+    client_args={
+        "base_url": "https://api.cohere.com/compatibility/v1",
+        "api_key": "<YOUR_KEY>",
+    },
+    model_id="command-a-03-2025",
+    stream=False,
+    params={
+        "stream_options": None
+    }
+)
+
+agent = Agent(model=model, tools=[calculator])
+agent("What is 2+2")
+```
+
+## Configuration
+
+### Client Configuration
+
+The `client_args` and `params` configure the underlying OpenAI client. For a complete list of available arguments, please refer to the [OpenAI](https://github.com/openai/openai-python) and [Cohere](https://docs.cohere.com/docs/compatibility-api#supported-parameters) sources.
+
+## Troubleshooting
+
+### Module Not Found
+
+If you encounter the error `ModuleNotFoundError: No module named 'openai'`, this means you haven't installed the `openai` dependency in your environment. To fix, run `pip install 'strands-agents[openai]'`.
+
+## References
+
+- [API](../../../api-reference/models.md)
+- [OpenAI](https://platform.openai.com/docs/overview)
+- [Cohere](https://docs.cohere.com/v2/cohere-documentation)