WhichModel for ChatGPT

io.github.which-model/whichmodel

Cost-optimized LLM model routing recommendations for autonomous AI agents

client:ChatGPT transport:streamable-http

Install WhichModel in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://whichmodel.dev/mcp

Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs