TLDR: Cosine is built for the point where coding agents usually start to break down: longer tasks, multiple threads of work, team handoff, and code you still need to maintain later.

PS. you can use your Claude Code, OpenAI and Copilot subscriptions (Don’t tell OpenCode or OpenClaw :P )

For OpenAI and Copilot subscriptions:
Launch Cosine CLI 
Ctrl+p and choose ChatGPT or Copilot subscription model 
You'll get redirected to ChatGPT or Copilot website for auth

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For Claude: 
Make sure you have a Claude Pro or Max subscription and have it installed on your local environment

Install the Cosine CLI — cosine.sh/cli (mac, windows and Linux supported)

Ctrl+p and choose the Claude Max Subscription (it works with both Claude pro and max)

Your Claude Code subscription is recognised automatically — Cosine uses the actual Claude Code binary, so no API key needed

Run cos in any repo — your Claude subscription quota is used directly, no extra Cosine billing for model usage)

https://youtu.be/F61PCXvXd3Y

More info:

If you’re already deep into AI coding tools, you probably know the feeling:

You start with quick wins in terminal, then pretty soon you want the same speed on bigger tasks, across more than one thread of work, without losing track of what the agent is actually doing or ending up with code your team has to clean up later.

That’s basically why we built Cosine 3.0

Cosine is one coding agent across CLI, VS Code, desktop, and cloud. So you can start with a quick local task, pick it up somewhere else later, or spin up parallel agents when the job gets bigger, without hopping between separate tools or losing context.

What we kept caring about as we built it was pretty simple:

We wanted something that still feels fast and direct, but gives you more visibility and more control once the work stops being a toy problem.

So you can inspect changes properly.

So you can follow what happened.

So you can undo things cleanly.

So you can run multiple threads of work when one agent is not enough.

So the whole thing still makes sense when other people on your team have to touch the code.

A lot of tools feel great right up until you want them to do more than one thing, in more than one place, on code that actually matters.

We wanted to build the version that keeps working after that point.