Claude Sonnet 5 Blog

Claude Sonnet 5 to Be Released This Week — What Is It and Why It Matters
Mar 19, 2026
Claude Sonnet 5

Claude Sonnet 5 to Be Released This Week — What Is It and Why It Matters

Anthropic intends to release Claude Sonnet 5 this week (reports point to February 3, 2026). The new Sonnet release is described as a meaningful jump over the Sonnet 4.5/Opus 4.5 family — promising bigger context windows, stronger multi-modal abilities, and competitive pricing.