What is the key difference between Carbon Arc and WhichModel?

Carbon Arc belongs to the Developer Tools category with cloud HTTP/SSE execution, while WhichModel belongs to the Developer Tools category with local stdio execution.

How do I install Carbon Arc or WhichModel in Claude Desktop or Cursor?

Copy the mcpServers JSON configuration snippet provided on this page into your claude_desktop_config.json or ~/.cursor/mcp.json file and restart your AI client.

Are Carbon Arc and WhichModel free or paid?

Carbon Arc operates under a Free / Open Source model (No auth required). WhichModel operates under a Free / Open Source model (No auth required).

Which MCP server has more tools and community activity?

Carbon Arc lists 0 tools with 0 views and 33 GitHub stars. WhichModel lists 0 tools with 0 views and 0 GitHub stars.

Can I use both Carbon Arc and WhichModel together in the same MCP host?

Yes! MCP hosts like Claude Desktop, Cursor, Windsurf, Cline, and VS Code support configuring multiple servers under the mcpServers object simultaneously.

How do I install Carbon Arc or WhichModel in Claude Desktop, Cursor, or Windsurf?

Both servers follow the standard Model Context Protocol configuration format. Simply copy the JSON block from the configuration section above and paste it into your AI client's mcpServers configuration object (for instance in claude_desktop_config.json or ~/.cursor/mcp.json ), then completely restart or refresh the application.

Are Carbon Arc and WhichModel free to use, or do they require API keys?

Carbon Arc is listed under a Free / Open Source model with No auth required . WhichModel operates under a Free / Open Source model with No auth required . If environment variables are required (such as API keys), be sure to define them under the env key in your MCP client's configuration file.

Can I run both Carbon Arc and WhichModel at the same time in my AI client?

Yes! MCP clients support multi-server orchestration. You can include both carbon-arc and whichmodel as distinct keys inside the single mcpServers object in your configuration file. Your AI assistant will automatically select and call the appropriate tool from either server during chat sessions.

Which MCP server has higher directory engagement and quality ratings?

On AllMCPs, Carbon Arc has a Quality Score of 41 /100 ( Fair ) with 0 views, 0 installs, and 33 GitHub stars. WhichModel holds a Quality Score of 27 /100 ( Emerging ) with 0 views, 0 installs, and 0 GitHub stars.

Side-by-Side Model Context Protocol Comparison

Carbon Arc vs WhichModel

In-depth architectural comparison of the Carbon Arc and WhichModel MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

At a Glance & Executive Verdict

Carbon Arc

Developer Tools · Remote HTTP/SSE

Quality: 41/100 (Fair) | Auth: No auth required

WhichModel

Developer Tools · Local stdio

Quality: 27/100 (Emerging) | Auth: No auth required

Verdict Summary: Choose Carbon Arc if you need specialized Developer Tools tools running via a hosted cloud SSE transport. Choose WhichModel if your workspace requires Developer Tools integration with local subprocess execution. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose Carbon Arc when:

You need dedicated capabilities in the Developer Tools domain.
You prefer remote streaming HTTP/SSE transport architecture.
Your security boundary fits: No auth required (Free / Open Source).

Explore Carbon Arc Details

Choose WhichModel when:

You need dedicated capabilities in the Developer Tools domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: No auth required (Free / Open Source).

Explore WhichModel Details

Feature & Specification Comparison

Specification	C Carbon Arc Developer Tools	W WhichModel Developer Tools
Summary	The infrastructure for the AI economy: primitives for inference, agents, and decisions.	Cost-optimized LLM model routing recommendations for autonomous AI agents
Category & Scope	Developer Tools	Developer Tools
Quality signal

Tools & Capabilities Breakdown

Carbon Arc Tools (0)

No explicit tool names declared in metadata yet. Check project README on main listing page.

WhichModel Tools (0)

No explicit tool names declared in metadata yet. Check project README on main listing page.

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

Carbon Arc Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "carbon-arc": {
      "url": "https://mcp.carbonarc.ai"
    }
  }
}

WhichModel Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "whichmodel": {
      "command": "npx",
      "args": [
        "-y",
        "whichmodel"
      ]
    }
  }
}

Frequently Asked Questions

Carbon Arc is categorized under Developer Tools and uses a remote streaming HTTP/SSE transport. In contrast, WhichModel belongs to Developer Tools using local stdio subprocess. Select Carbon Arc when you need capabilities focused on developer tools and WhichModel when you require tools for developer tools.

More alternatives to Carbon Arc More alternatives to WhichModel Developer Tools category hub