OpenRouter

At a glance

Set these per environment. See Connect an integration.

Variable	Required	Description
`OPENROUTER_API_KEY`	Yes	OpenRouter API key (starts with sk-or-) Docs.

Create an OpenRouter account: Go to https://openrouter.ai and sign up or sign in. Some models offer free variants for testing; paid models require purchasing credits under Settings → Credits.
Create an API key: Open https://openrouter.ai/settings/keys, click ‘Create Key’, and optionally set a credit limit for the key.
Store the key: Copy the key and add it to your .env file as OPENROUTER_API_KEY=sk-or-…
Verify access: Run the List Models tool to confirm the key works, then try a chat completion with a model like openai/gpt-4o-mini.

Model IDs are namespaced as vendor/model, e.g. anthropic/claude-sonnet-4
Chat completions consume prepaid credits; use the Get Generation tool to inspect the exact cost of a request
The Get Credits endpoint requires a management key per OpenRouter’s docs - a regular inference key may be rejected there

Tool	Access	Description
List Models	Read	List the models available through OpenRouter
Create Chat Completion	Write	Generate a chat completion from any OpenRouter model
Get Generation	Read	Get metadata, token counts, and cost for a past generation by ID
Get Current Key	Read	Get the current API key’s label, credit usage (total/daily/weekly/monthly in USD), spend limit, remaining limit, and free-tier status - works with the regular inference key
Get Credits	Read	Get total credits purchased and used for the account (OpenRouter requires a management key for this endpoint)

List the models available through OpenRouter and highlight a few with large context windows.
Use OpenRouter to send the same prompt to two different models and compare the responses.