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Map / Core AI / Foundation Models / Claude / Sonnet

Claude Sonnet

by Anthropic · part of Claude · Text

Anthropic's mid-tier line balancing intelligence, speed and price; the everyday workhorse for coding and agents.

Latest version

Sonnet 5.528 Sep 2026 · 30 days ago

Versions

8since Claude 3 Sonnet in March 2024

Typical gap

133 daysmedian between versions, last 12 months

All versions

VersionReleasedAfter previousStatusSource
Claude Sonnet 5.528 Sep 202690 daysLatestanthropic.com
Claude Sonnet 530 Jun 2026133 daysanthropic.com
Claude Sonnet 4.617 Feb 2026141 daysanthropic.com
Claude Sonnet 4.529 Sep 2025130 daysDeprecatedanthropic.com
Claude Sonnet 422 May 202587 daysRetiredanthropic.com
Claude 3.7 SonnetClaude Sonnet 3.724 Feb 2025249 daysRetiredanthropic.com
Claude 3.5 SonnetClaude Sonnet 3.520 Jun 2024108 daysRetiredanthropic.com
Claude 3 SonnetClaude Sonnet 34 Mar 2024FirstRetiredanthropic.com

Dates from Anthropic's own announcements; each row links to its source.

The Claude family

2023202420252026TodayOpusClaude 3 Opus (Claude Opus 3), 4 Mar 20243Claude Opus 4, 22 May 20254Claude Opus 4.1, 5 Aug 20254.1Claude Opus 4.5, 24 Nov 20254.5Claude Opus 4.6, 5 Feb 20264.6Claude Opus 4.7, 16 Apr 20264.7Claude Opus 4.8, 28 May 2026Claude Opus 5, 24 Jul 20265Claude Opus 5.5, 22 Sep 20265.5SonnetClaude 3 Sonnet (Claude Sonnet 3), 4 Mar 20243Claude 3.5 Sonnet (Claude Sonnet 3.5), 20 Jun 20243.5Claude 3.7 Sonnet (Claude Sonnet 3.7), 24 Feb 20253.7Claude Sonnet 4, 22 May 20254Claude Sonnet 4.5, 29 Sep 20254.5Claude Sonnet 4.6, 17 Feb 20264.6Claude Sonnet 5, 30 Jun 20265Claude Sonnet 5.5, 28 Sep 20265.5HaikuClaude 3 Haiku (Claude Haiku 3), 13 Mar 20243Claude 3.5 Haiku (Claude Haiku 3.5), 4 Nov 20243.5Claude Haiku 4.5, 15 Oct 20254.5Claude Haiku 5.5, 7 Oct 20265.5FableClaude Fable 5, 9 Jun 20265Claude Fable 5.1, 1 Sep 20265.1LegacyClaude 1, 14 Mar 20231Claude 2, 11 Jul 20232Claude 2.1, 21 Nov 20232.1

VersionPreviewLatest version

Questions

What is the latest version of Claude Sonnet?

Claude Sonnet 5.5, released on 28 Sep 2026.

When was Claude Sonnet 5 released?

Claude Sonnet 5 came out on 30 Jun 2026.

When was Claude Sonnet 4.6 released?

Claude Sonnet 4.6 came out on 17 Feb 2026.

When was Claude Sonnet 4.5 released?

Claude Sonnet 4.5 came out on 29 Sep 2025.

How often is there a new Claude Sonnet?

Over the last 12 months a new version came about every 133 days (the median gap). 8 versions have come out since Claude 3 Sonnet in March 2024.