MCP

Your private model, inside every tool

Fine-tune a model on Nucleus, then expose it behind MCP. The editors and agents your teams already use connect with one configuration block.

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mcp.json

{
  "mcpServers": {
    "nucleus": {
      "url": "https://api.nucleus-ai.io/mcp",
      "headers": { "Authorization": "Bearer nk_live_8x…" }
    }
  }
}

ClientsStreamable HTTP · JSON-RPC

Claude Desktop

connected

Claude Code

connected

Any MCP client

same server entry

Key

nk_live_8x… · read, infer

One endpoint, every client

Your fine-tuned model is reachable from any tool that speaks MCP. The client sends a message; Nucleus handles the inference.

Scoped credentials

The key the client holds carries only the scopes it needs. Bind it to one project, and a leaked key reaches that project alone.

The same key, three routes

One API key authenticates MCP, the OpenAI-compatible route and the Anthropic-compatible route. No separate credentials per protocol.

Expose your fine-tuned model to MCP clients

A model trained on Nucleus is served through a private endpoint. The MCP server wraps that endpoint so any MCP-compatible tool can reach it. The client authenticates with your API key and addresses the model by its checkpoint path or base model ID.

Results

Results from LLMs powered by Nucleus

$177K

downtime prevented this month

47 vehicles

rerouted in a single fleet optimisation

$73.4K

monthly revenue re-attributed in marketing

94%

prediction accuracy on equipment failures

Manufacturing

Line 3's next failure, booked into the maintenance window

$177Kdowntime prevented

18.3 daysadvance notice

Fleet operations

47 trucks rerouted while they were still moving

$2.4Kdaily fuel saved

23delays resolved without a call

At a glance

What MCP on Nucleus includes

Protocol

MCP compliant
Streamable HTTP transport
JSON-RPC messages

Authentication

Scoped API keys (read, train, infer, admin)
Project-bound credentials
Environment prefixes: nk_live_, nk_test_

Compatibility

OpenAI-compatible route (/v1)
Anthropic-compatible route (/anthropic)
One key for all three protocols

Governance

Four access policy gates on every call
Append-only audit trail
Revocation on the next request

Pricing

Served tokens

$0.15 – $6.50per million tokens

Calls through MCP are metered the same way as any private endpoint: per million input and output tokens. Language models from $0.15/Mtok (Nemotron 3.5 Lightning) to $6.50/Mtok (Kimi K3).

Pick your path