---
title: "OpenRouter · Context Atlas"
description: "OpenRouter (AI gateway) for coding agents: 2 sources, including an llms.txt and an MCP server, and the files that show a project uses it."
canonical: "https://contextatlas.dev/topics/openrouter"
updatedAt: "2026-10-23"
---

# OpenRouter · Context Atlas

> The sources OpenRouter publishes for coding agents. Fetch the llms.txt or Rules source first; fetch Full text sources only to search them, they are often several megabytes. Full catalog and instructions: https://contextatlas.dev/llms.txt

Last updated: 2026-10-23

### OpenRouter
Role: AI gateway
Signals: OPENROUTER_API_KEY env var, openrouter.ai/api/v1 base URL, model IDs such as openai/gpt-4o
- [OpenRouter llms.txt](https://openrouter.ai/llms.txt): llms.txt
- [OpenRouter MCP server setup](https://openrouter.ai/docs/guides/overview/mcp-server.md): MCP server

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