Openrouter Fusion in Claude Code :))

gistfile1.txt

  Set up a separate `or` command that launches Claude Code through OpenRouter, without changing or
  interfering with my normal Claude Code setup.

  Requirements:
  1. Ask me for my OpenRouter API key before making changes.
     - Do not print the key back to me.
     - Store it securely enough for normal shell use:
       - On macOS/Linux: add it to my shell profile as `OPENROUTER_API_KEY`, unless a better local
       convention already exists.
       - On Windows: store it as a User environment variable named `OPENROUTER_API_KEY`.
     - Do not hardcode the key directly inside the `or` function if avoidable.

  2. Create an `or` command/function that runs Claude Code with:
     - OpenRouter base URL: `https://openrouter.ai/api`
     - Auth token from `OPENROUTER_API_KEY`
     - `ANTHROPIC_API_KEY` explicitly blanked
     - Separate Claude config directory so it does not affect my normal Claude usage:
       - macOS/Linux: `$HOME/.claude-openrouter`
       - Windows: `$HOME\.claude-openrouter`
     - Model: `openrouter/fusion`
     - Skip permissions enabled, same as:
       `claude --dangerously-skip-permissions --model "openrouter/fusion"`

  3. Make this work in new terminals:
     - On macOS/Linux:
       - Detect my shell using `$SHELL`.
       - For zsh, update `~/.zshrc`.
       - For bash, update `~/.bashrc` or `~/.bash_profile` as appropriate.
       - For fish, update `~/.config/fish/config.fish` using fish syntax.
     - On Windows:
       - Update both PowerShell 7 and Windows PowerShell current-user profiles if they exist or may be
       used:
         - `$HOME\Documents\PowerShell\Microsoft.PowerShell_profile.ps1`
         - `$HOME\Documents\PowerShell\profile.ps1`
         - `$HOME\Documents\WindowsPowerShell\Microsoft.PowerShell_profile.ps1`
         - `$HOME\Documents\WindowsPowerShell\profile.ps1`
       - Preserve existing profile content.
       - Do not remove existing functions like `claude`, `clawd`, aliases, or custom helpers.

  4. Avoid duplicate setup:
     - If an `or` function already exists, replace only the managed `or` block or ask before
     overwriting if it appears user-authored.
     - Add clear begin/end comments around the managed block, for example:
       `# BEGIN OpenRouter Claude Code wrapper`
       `# END OpenRouter Claude Code wrapper`

  5. Verify after setup:
     - Start a fresh shell process or source the edited profile.
     - Confirm `or` resolves as a command/function.
     - Run `or --version` or the safest equivalent to verify Claude Code launches through the wrapper
     without starting a full agent session.
     - Do not run a long interactive Claude session unless I explicitly approve it.

  6. Explain what changed:
     - List the profile files edited.
     - Confirm the key was stored without displaying it.
     - Confirm normal `claude` and existing commands still use the original Claude setup.
     - Tell me to open a new terminal and run:
       `or`

  Use these model details:
  - Main model slug: `openrouter/fusion`
  - Fusion panel I want conceptually:
    - `anthropic/claude-opus-4.8`
    - `google/gemini-3.1-pro-preview`
    - `openai/gpt-5.5`

  Important caveat:
  Claude Code can pass the `openrouter/fusion` model slug, but may not be able to pass OpenRouter
  Fusion plugin request-body fields like `analysis_models`. If exact panel customization is not
  possible through Claude Code CLI, still set up `or` with `openrouter/fusion` and tell me clearly
  what limitation remains.

  Implementation examples:

  PowerShell function should look like this:

  function or {
    if (-not $env:OPENROUTER_API_KEY) {
      throw "OPENROUTER_API_KEY is not set. Restart PowerShell or set it in your user environment."
    }

    $env:CLAUDE_CONFIG_DIR = Join-Path $HOME ".claude-openrouter"
    $env:ANTHROPIC_BASE_URL = "https://openrouter.ai/api"
    $env:ANTHROPIC_AUTH_TOKEN = $env:OPENROUTER_API_KEY
    $env:ANTHROPIC_API_KEY = ""

    & claude --dangerously-skip-permissions --model "openrouter/fusion" @args
  }

  zsh/bash function should look like this:

  or() {
    if [ -z "$OPENROUTER_API_KEY" ]; then
      echo "OPENROUTER_API_KEY is not set. Restart your shell or set it in your environment." >&2
      return 1
    fi

    CLAUDE_CONFIG_DIR="$HOME/.claude-openrouter" \
    ANTHROPIC_BASE_URL="https://openrouter.ai/api" \
    ANTHROPIC_AUTH_TOKEN="$OPENROUTER_API_KEY" \
    ANTHROPIC_API_KEY="" \
    claude --dangerously-skip-permissions --model "openrouter/fusion" "$@"
  }

  fish function should use fish syntax and preserve argument forwarding.