Welcome Sonnet 4.5 to Theia AI (and Theia IDE)
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.