ReleasedMay 22, 2025 ·
Claude Sonnet 4 is out
Anthropic shipped Claude Sonnet 4.
AnthropicAnthropic released Claude Sonnet 4 on May 22, 2025.
It follows Claude 3.7 Sonnet, 87 days earlier. Releases in the Claude Sonnet line usually land about 130 days apart.
Claude Sonnet 4.5 replaced it on Sep 29, 2025.
Released
May 22, 2025
Line
Claude Sonnet
Previous
Claude 3.7 Sonnet (Feb 24, 2025)
Confirmed by
Historical record
Daily digest
The day's biggest AI news in one short email, every morning. Plus an instant heads-up when a reset or a big release lands.