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OpenRouter (Built-in)

The built-in HTTP agent that connects directly to the OpenRouter API. No CLI tools or external processes required.

Setup

  1. Get an API key — Sign up at openrouter.ai and create an API key from your dashboard.
  2. Open Project Settings — In the Unreal Editor, go to Edit > Project Settings > Plugins > Blueprint AI.
  3. Enter your API key — Paste your key into the OpenRouter API Key field under the BAI Agents section.
  4. Select a model — Use the model dropdown in the chat UI to pick from 200+ available models. The default is anthropic/claude-sonnet-4.

Key Details

TypeHTTP (direct API calls)
ACP AdapterN/A
Default Modelanthropic/claude-sonnet-4
Fab-compliantYes (no external processes)

Notes

  • Manages its own conversation history and tool-calling loop internally.
  • Uses SSE (Server-Sent Events) for streaming responses.
  • Supports model switching mid-session via the chat UI dropdown.