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

# OpenRouter

> Learn how to use OpenRouter with Cline to access a wide variety of language models through a single API.

OpenRouter is an AI platform that provides access to a wide variety of language models from different providers, all through a single API. This can simplify setup and allow you to easily experiment with different models.

**Website:** [https://openrouter.ai/](https://openrouter.ai/)

### Getting an API Key

1. **Sign Up/Sign In:** Go to the [OpenRouter website](https://openrouter.ai/). Sign in with your Google or GitHub account.
2. **Get an API Key:** Go to the [keys page](https://openrouter.ai/keys). You should see an API key listed. If not, create a new key.
3. **Copy the Key:** Copy the API key.

### Supported Models

OpenRouter supports a large and growing number of models. Cline automatically fetches the list of available models. Refer to the [OpenRouter Models page](https://openrouter.ai/models) for the complete and up-to-date list.

### Configuration in Cline

1. **Open Cline Settings:** Click the settings icon (⚙️) in the Cline panel.
2. **Select Provider:** Choose "OpenRouter" from the "API Provider" dropdown.
3. **Enter API Key:** Paste your OpenRouter API key into the "OpenRouter API Key" field.
4. **Select Model:** Choose your desired model from the "Model" dropdown.
5. **(Optional) Custom Base URL:** If you need to use a custom base URL for the OpenRouter API, check "Use custom base URL" and enter the URL. Leave this blank for most users.

### Supported Transforms

OpenRouter provides an [optional "middle-out" message transform](https://openrouter.ai/docs/features/message-transforms) to help with prompts that exceed the maximum context size of a model. You can enable it by checking the "Compress prompts and message chains to the context size" box.

### Tips and Notes

* **Model Selection:** OpenRouter offers a wide range of models. Experiment to find the best one for your needs.
* **Pricing:** OpenRouter charges based on the underlying model's pricing. See the [OpenRouter Models page](https://openrouter.ai/models) for details.
* **Prompt Caching:**
  * OpenRouter passes caching requests to underlying models that support it. Check the [OpenRouter Models page](https://openrouter.ai/models) to see which models offer caching.
  * For most models, caching should activate automatically if supported by the model itself (similar to how Requesty works).
  * **Exception for Gemini Models via OpenRouter:** Due to potential response delays sometimes observed with Google's caching mechanism when accessed via OpenRouter, a manual activation step is required *specifically for Gemini models*.
  * If using a **Gemini model** via OpenRouter, you **must manually check** the "Enable Prompt Caching" box in the provider settings to activate caching for that model. This checkbox serves as a temporary workaround. For non-Gemini models on OpenRouter, this checkbox is not necessary for caching.