Claude Haiku

Anthropic · lightweight line

3 releases since 2024Latest: Claude Haiku 4.5

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 Haiku line · lightweight

Due329 days since the last release — usual gap is 291

Days since last release

Claude Haiku 4.5 · Oct 15, 2025

329

days

Usual gap

291

days

Recent gaps

Claude Haiku 4.5 · Oct 2025

358

Claude 3.5 Haiku · Oct 2024

223

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

Oct

Oct

Mar

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