OpenRouter

Recommended Built-in

Built-in HTTP agent with access to 200+ models. No CLI installation or external process required -- just add your API key and start prompting.

OVERVIEW

- OpenRouter is the default and recommended agent for Blueprint AI.

- It runs as an HTTP agent inside the plugin process -- no external CLI, no Node.js, no spawned subprocesses.

- Requests are sent directly to the OpenRouter API, which routes to the model provider of your choice.

- All Blueprint AI tools are available to every model that supports tool use.

SETUP

1. Get an API key

https://openrouter.ai/keys

Create a free account and generate an API key. Free-tier keys have rate limits but work for testing.

2. Add the key in Unreal

# Path

Project Settings > Plugins > Blueprint AI > OpenRouter API Key

3. Select a model

Use the model picker in the chat panel or set a default model in Project Settings. The plugin sends your selection as the model parameter to OpenRouter.

SUPPORTED_MODELS

Any model available on OpenRouter that supports tool use will work. Recommended models for Blueprint AI:

Claude Sonnet 4(anthropic/claude-sonnet-4)Best balance of speed and quality

Claude Opus 4(anthropic/claude-opus-4)Highest quality, slower

GPT-4o(openai/gpt-4o)Fast, good tool use

Gemini 2.5 Pro(google/gemini-2.5-pro)Large context window

Gemini 2.5 Flash(google/gemini-2.5-flash)Fast and affordable

Llama 4 Maverick(meta-llama/llama-4-maverick)Open source

NOTES

- Billing is handled by OpenRouter, not Blueprint AI. Check your usage at openrouter.ai/usage.

- Some models may not support all tool types. If a tool call fails, try a different model.

- OpenRouter supports streaming responses, so you will see output appear in real time.