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You need Copilot Pro or Enterprise.

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Quick start

Install and sign in

You need Node.js 22 or later, git, and bash. On Windows, run the installer from Git Bash. PowerShell breaks the script’s line endings.
Sign in with your browser, or paste a Fireworks API key (fw_...).If the Nexus CLI is already installed and signed in, skip to step 2.

Quit VS Code

Quit VS Code before you connect or run off. A running VS Code overwrites the change from memory. If it’s open, Nexus CLI waits until you quit.

Connect VS Code

Nexus Auto is the default model. To pick another one, run nexus vscode --model <id>, such as --model glm-latest.

Restart and pick a model

Restart VS Code, then pick a model under Other Models → Fireworks in Copilot Chat.
VS Code Chat model picker showing the Fireworks provider with Auto selected and DeepSeek, GLM, and Kimi models

VS Code Chat after Nexus CLI, with Auto selected under Fireworks (Enterprise account)

To restore your original settings, quit VS Code and run nexus vscode off.

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Use Nexus Auto

  • Anthropic and OpenAI model turns need a Provider Key from your admin.
  • glm-latest and glm-fast-latest are text-only, and glm-flash-latest supports images.

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MCP and tools

  • Nexus CLI doesn’t change your MCP servers.
  • Nexus CLI doesn’t add web search to VS Code.

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Troubleshooting

  • 401 errors after you rotate your key: quit VS Code, then run nexus login. It saves the new key into every connected harness that keeps its own copy, including VS Code.
Fixes for issues that affect every harness are in Nexus Auto troubleshooting.

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Manual setup (advanced)

In Copilot Chat, open Language Models, click + Add Models…, and choose Custom Endpoint. Use https://api.fireworks.ai/inference/v1, your Fireworks key, and a model ID such as glm-latest. Step-by-step screenshots are in GitHub Copilot. Without the Nexus CLI, you take over the tasks it otherwise performs, such as undo and updates.