Eclipse Theia

Claude Code is now natively integrated into Eclipse Theia and more.

CrossModel demonstrates a unified modeling experience built on Eclipse Theia, combining form-based, graphical, and textual editors, all synchronised via a language server.

Project context files are the secret to reliable, efficient AI coding. Learn 3 proven ways to make them more effective, and turn AI from a guessing game into a productive teammate. In the AI-native Theia IDE and any other tool such as Copilot, Claude Code, Cursor, and more.

The TheiaCon 2025 keynote provides a comprehensive update on a breakthrough year for the Eclipse Theia ecosystem, including major AI, platform, and architecture enhancements. A great overview for anyone interested in modern, open, AI-native tooling. The recording is now available!

Eclipse Theia 1.66 delivers a feature-rich update with persistent AI chat sessions, slash commands, agent modes, and new GitHub and Project Info agents. It also brings significant debugging, UI, and API improvements. Check out the full announcement!

Congratulations to the Eclipse Theia team on winning the CODiE Award for best open source development tool! 

AI agents don’t have to work alone. Discover how Theia AI enables seamless, on-demand collaboration between specialised agents to tackle complex coding tasks together. This demo shows how a coding agent and a GitHub agent team up in real time, offering a glimpse into the future of AI-native development environments.

The Eclipse Theia 1.65 release brings cutting-edge AI integration with native Claude Code support, backend preferences, and major improvements for browser-only IDEs. From seamless AI-powered workflows to enhanced debugging and MCP server capabilities, this update is a must-read for developers building modern, cloud-based IDEs.

Claude Code is now natively integrated into Theia IDE, combining one of the most powerful AI coding agents with a fully open-source, customisable developer environment. If you've been waiting for true, seamless AI assistance directly inside your IDE, this release is a game-changer.

Read more: https://eclipsesource.com/blogs/2025/10/14/its-released-your-native-cla…

Sonnet 4.5 is supported in Theia AI and the Theia IDE, out-of-the-box, unlocking powerful, long-running coding agents with zero setup hassle. If you're building tools or writing code, this update brings smarter automation, better reasoning, and seamless performance—ready to use in just a few clicks.