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Ollama now supports the Anthropic Messages API, enabling developers to run Claude Code with local open-source models completely free. The guide covers installing Ollama, downloading models (both local like gpt-oss:20b and cloud-based like qwen3-coder:480b-cloud), configuring Claude Code to work with these models, and demonstrates practical examples including a Python Hello World script and a full kanban board web application. While not matching Anthropic's flagship models, this approach provides a cost-effective alternative for development tasks and learning.

How to Run Claude Code for Free with Local and Cloud Models from Ollama