Claude Sonnet

Anthropic · lightweight line

7 releases since 2024Latest: Claude Sonnet 5

Where the line stands

How long it has been since the last release against the line's usual gap and its recent ones — the rhythm, not a date.

Anthropic · Claude Sonnet line · lightweight

Mid-cycle71 of ~133 days into its usual cycle

Replaced Sonnet 4.6 as the default model on Anthropic's Free and Pro plans, priced at $2 per million input tokens and $10 per million output tokens.

Days since last release

Claude Sonnet 5 · Jun 30, 2026

days

Usual gap

133

days

Recent gaps

Claude Sonnet 5 · Jun 2026

133

Claude Sonnet 4.6 · Feb 2026

141

Claude Sonnet 4.5 · Sep 2025

130

Claude Sonnet 4 · May 2025

Newest first — what each version changed versus the one before, in Anthropic's own numbers.

Jun

Replaced Sonnet 4.6 as the default model on Anthropic's Free and Pro plans, priced at $2 per million input tokens and $10 per million output tokens.

Feb

Sep

May

Feb

Jun

Mar

One email a week: what AI models shipped, the actual differences vs the previous version, and what's coming next. No filler.