Changelog · Kiro · AWS

Models: Claude Sonnet 4 reaches end of life

Published Oct 14, 2026 (10d ago). Newer: IDE: Choose When Kiro Uses Workflows (Oct 22, 2026)

Changelog

Models: Claude Sonnet 4 reaches end of life

Claude Sonnet 4 has reached end of life in Kiro as of October 14, 2026. If your work depends on it, choose another available model before continuing. Claude Sonnet 5.5 is the latest Sonnet model. See Model lifecycle for lifecycle stages and end-of-life dates.