Nexus CLI — AI skill for Claude Code

Nexus

[](https://github.com/fw-ai/nexus-cli/blob/main/LICENSE)

Use [Fireworks AI](https://fireworks.ai) models inside the coding harnesses you already use: Claude Code, Claude Desktop, OpenCode, Codex, Pi, Cursor, VS Code, GitHub Copilot (app and CLI), and DeepSeek Harness.

Nexus is a small CLI that points each harness at Fireworks by editing that harness's own settings. No hosted service, nothing extra to run:

• nexus routes it through Fireworks and registers Fireworks models in its picker.
• nexus off puts your original settings back exactly as they were, byte for byte.
• One Fireworks key is stored once (OS keychain where available) and shared by every harness you connect.

**Contents:** [Quick start](#quick-start) · [Supported harnesses](#supported-harnesses) · [Default models](#default-models) · [Claude Code](#claude-code) · [Codex](#codex) · [OpenCode](#opencode) · [Pi](#pi) · [Cursor](#cursor) · [VS Code Chat](#vs-code-chat) · [GitHub Copilot app](#github-copilot-app) · [GitHub Copilot CLI](#github-copilot-cli) · [DeepSeek Harness](#deepseek-harness) · [Claude Desktop](#claude-desktop) · [FireRouter](#firerouter) · [Models](#models) · [Azure / Foundry](#azure-microsoft-foundry-endpoints) · [CLI reference](#cli-reference) · [Keys and storage](#keys-and-storage) · [Troubleshooting](#troubleshooting) · [Upgrade and uninstall](#upgrade-and-uninstall)

Quick start

**1. Install**

curl -fsSL https://nexus.fireworks.ai/install.sh | bash

Or install direct from GitHub:

curl -fsSL https://raw.githubusercontent.com/fw-ai/nexus-cli/main/install.sh | bash

**2. Sign in**

nexus login        # browser sign-in, or paste a fw_… key

**3. Connect a harness**

nexus claude       # routes through Fireworks, appends the catalog to /model

✓ Claude Code → Fireworks · auto
Model picker
  Anthropic