Claude Opus 5.5 is now available across Kiro IDE, CLI, Crew, and Web for Pro and higher tiers, offering stronger performance on complex coding tasks with a 1M-token context window at a reduced 2.0x credit multiplier. Power management commands let you install and uninstall Powers directly in chat or via CLI without starting a session. V3 output styles can now be customized, and fullscreen scrolling speed is tunable. A new SessionEnd Hook enables automated session cleanup.