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

# Claude Code

> Use your Claude Max or Pro subscription with Sixth instead of paying per token. Learn how to set up and configure the Claude Code provider.

**Website:** [https://docs.anthropic.com/en/docs/claude-code/setup](https://docs.anthropic.com/en/docs/claude-code/setup)

The Claude Code provider lets you use your existing Claude subscription with Sixth. If you have Claude Max or Pro, this means you can use Claude in Sixth without paying extra API costs.

<Frame>
  <img src="https://storage.googleapis.com/sixth_public_images/docs/assets/claude-code-use-opus.gif" alt="Using the Claude Code provider in Sixth with Opus model" />
</Frame>

## Setup

First, you'll need to install and authenticate Claude Code on your system:

1. **Install Claude Code**: Follow Anthropic's [official setup guide](https://docs.anthropic.com/en/docs/claude-code/setup) to install and authenticate the Claude CLI.

2. **Configure in Sixth**:
   * Open Sixth settings (⚙️ icon)
   * Select **Claude Code** from the **API Provider** dropdown
   * Set the path to your Claude CLI executable (usually just `claude` if it's in your PATH)

<Frame>
  <img src="https://storage.googleapis.com/sixth_public_images/docs/assets/claude-code-setup.gif" alt="Setting up the Claude Code provider in Sixth" />
</Frame>

<br />

<Accordion title="Windows Setup">
  Anthropic introduced full support for Claude Code on Windows. Follow the [instructions on how to set up Claude Code
  normally](#setup) and make sure you have the latest Claude Code and Sixth versions.
</Accordion>

### Finding your Claude Code path

If you're not sure where Claude Code is installed:

* **macOS / Linux**: Run `which claude` in your terminal
* **Windows (Command Prompt)**: Run `where claude`
* **Windows (PowerShell)**: Run `Get-Command claude`

## Supported Models

The Claude Code provider supports these models:

* `claude-sonnet-4-20250514` (Recommended)
* `claude-opus-4-1-20250805`
* `claude-opus-4-20250514`
* `claude-3-7-sonnet-20250219`
* `claude-3-5-sonnet-20241022`
* `claude-3-5-haiku-20241022`

## How it works

When you use Claude Code with Sixth, here's what happens behind the scenes:

Sixth wraps the Claude Code CLI to handle your requests. Each time you send a message, Sixth starts a new `claude` process, sends your conversation, and streams the response back. The AI reasoning comes from Claude Code, but all the actual file editing, terminal commands, and other tools are handled by Sixth.

The main difference you'll notice is that responses don't stream character-by-character like other providers. Instead, Claude Code processes your full request before sending back the complete response.

## Limitations

There are a few things to keep in mind with Claude Code:

* Images in your messages get converted to text placeholders since Claude Code doesn't support image uploads through the CLI
* Prompt caching isn't available with this provider
* Responses don't stream in real-time like other providers

## Troubleshooting

If you run into issues:

**Authentication problems**: Make sure you're logged into Claude Code with your subscription account. Run `claude auth status` to check.

**Path issues**: Double-check that the Claude CLI path in Sixth's settings is correct. Try running `claude --version` in your terminal to verify it's working.

**Still having trouble?** We're actively improving this integration. Report issues on our [GitHub](https://github.com/sixth/sixth/issues) or ask for help in our [Discord](https://discord.gg/sixth).

## Usage with subscriptions

If you have a Claude Max subscription, your usage in Sixth shows up as \$0.00 in the billing interface since you're not paying additional API costs. Your usage still counts against your subscription limits, but you won't see per-token charges.

For more details about using Claude Code with your subscription, check out Anthropic's documentation:

* [Claude Code Setup Guide](https://docs.anthropic.com/en/docs/claude-code/setup)
* [Using Claude Code with Pro/Max Plans](https://support.anthropic.com/en/articles/11145838-using-claude-code-with-your-pro-or-max-plan)