Base URL

You might say

I've switched the model API endpoint to our team's self-hosted proxy. Where do I update the Base URL to make it work?

A Base URL is the address prefix shared by a group of API requests.For example, one client may combine https://openrouter.ai/api/v1 with /chat/completions to form the full request URL. Whether /v1 belongs in the prefix and which path the client appends depend on both the service and the client. Check both sets of official documentation instead of applying one fixed pattern.

Configuration docs for common providers

The same provider may offer more than one interface. Confirm which interface your tool supports before copying an address.

What is a Base URL?

Use a restaurant address to understand Base URL: Imagine the AI tool as someone placing an order for you. The Base URL is like the restaurant's address: it tells the tool where to send the request; it does not choose the model.

Where can you find the Base URL setting?: Codex: ~/.codex/config.toml; Claude Code: global ~/.claude/settings.json, project-level .claude/settings.json. If you use an environment variable, also check ANTHROPIC_BASE_URL.

A local service may use its own address: A local model may use http://localhost:11434/v1, which sends the request to your computer; it is not the same address as OpenRouter.

Quick checkChoose the best answer

Which Base URL is suitable when configuring OpenRouter?

Use `https://openrouter.ai/api/v1` and let the tool add the request pathUse the full `https://openrouter.ai/api/v1/chat/completions`Use only `https://openrouter.ai` and leave out `/api/v1`

You can say this to an AI Agent

Check whether this configuration should use `https://openrouter.ai/api/v1` as the Base URL and confirm that the tool adds the request path afterward. Do not print a real key.

Learn next

1Provider→2API Proxy→3OpenAI-Compatible API→

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