Claude Sonnet 4.5 Revolutionizes AI Coding: Checkpoint System Enables True Developer Collaboration

Claude Sonnet 4.5: When AI Coding Agents Learn “Undo” and “Multithreaded Thinking” How Anthropic’s latest release is transforming AI from a coding assistant to a true collaborative partner It’s 2 AM. You’re staring at a massive codebase that needs refactoring, with hundreds of git commits behind you, and every change risks introducing new bugs. Have you ever wished for a technical partner who not only understands your needs but can also rewind mistakes with a single command? This is no longer science fiction. With Anthropic’s latest release of Claude Sonnet 4.5 and the accompanying Claude Code upgrades, this experience is …