Dev.to
5/11/2026

Built autonomous coding agent for
Original: I Built a Fully Autonomous Coding Agent for Under $50/Month — Here's the Exact Setup
Short summary
Developer built a fully autonomous coding agent handling 70% of daily tasks for $47/month using LangGraph to intelligently route tasks between Claude, GPT-4o, and Gemini based on their strengths. Multi-model orchestration delegates refactoring to Claude, debugging to GPT-4o, and documentation to Gemini, saving costs while improving quality. Complete setup includes file operations, terminal access, Git integration, test automation, and working code—extending beyond GitHub Copilot's IDE-only limitations.
- •Multi-model routing reduces LLM costs by assigning tasks to best-fit models (Claude for refactoring, GPT-4o for debugging, Gemini for docs)
- •Custom agent with file system, terminal, and test execution handles 70% of daily development work autonomously
- •Complete working Python code provided for LangGraph state machine, model router, and dev tools layer
Generated with AI, which can make mistakes.
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