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Documentation Index

Fetch the complete documentation index at: https://docs.costa.app/llms.txt

Use this file to discover all available pages before exploring further.

Routers only work on traffic flowing through Costa. If you haven’t connected yet, start there.
Cosmic Routers let you send requests to multiple models and providers. You can use them to extend your subscriptions by adding a second model. Let’s build one called daily-driver — 75% Opus on your Claude Max, 25% Kimi-K2.6 via OpenRouter.
Did you know, mixing models like this can increase overall performance? Learn more
1

Add a second provider

Kimi-K2.6 is on OpenRouter, so let’s add it.You’ll need an OpenRouter API key. If you don’t have one, grab one from openrouter.ai — it takes a minute.
  1. Go to AI Providers and click Add provider.
  2. Pick OpenRouter and paste your API key.
  3. On the OpenRouter row, click Edit models and add kimi-k2.6 to the enabled list.
2

Build the router

  1. Go to Models and click Add a router.
  2. Name it daily-driver.
  3. Add two models with a 75/25 split:
    • 75% → claude-opus-4.7 (your Claude Max subscription)
    • 25% → kimi-k2.6 (via OpenRouter)
  4. Save.
Your router is now available as costa/daily-driver.
3

Point your tool at it

In Claude Code, run:
/model daily-driver
4

See it route

Send a few prompts. In your session logs, click the latest session — every request shows the model your router picked, and you can watch the 75/25 split hold across the session.
That’s a Cosmic Router. The subscription you already pay for. The open-weight models you heard about. Working together. You’re connected. You’re trimming. You’re routing. That’s Costa. Now go use it. The more traffic you send through, the more Costa learns about your work — and the more it can tell you back. We’ll show you that next. But first: go build something.