Anthropic model releases

Release dates for every Claude model Anthropic has shipped, newest first. The latest is Claude Sonnet 5.5, released 28 Sep 2026, and 11 of the 26 run on Opper today. Over the last 12 months Anthropic released 12 models, with a new release typically every 24 days.

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September 20263 releases
  1. 28 Sep
    Claude Sonnet 5.556
  2. 22 Sep
    Claude Opus 5.558
  3. 1 Sep
    Claude Fable 5.153
July 20261 release
  1. 24 Jul
    Claude Opus 551
June 20262 releases
  1. 30 Jun
    Claude Sonnet 538
  2. 9 Jun
    Claude Fable 550
May 20261 release
  1. 28 May
    Claude Opus 4.842
April 20261 release
  1. 16 Apr
    Claude Opus 4.741
February 20262 releases
  1. 17 Feb
    Claude Sonnet 4.625
  2. 5 Feb
    Claude Opus 4.626
November 20251 release
  1. 24 Nov
    Claude Opus 4.524
October 20251 release
  1. 15 Oct
    Claude 4.5 Haiku15
September 20251 release
  1. 29 Sep
    Claude 4.5 Sonnet19
August 20251 release
  1. 5 Aug
    Claude 4.1 Opus19
May 20252 releases
  1. 22 May
    Claude 4 Opus17
    Claude 4 Sonnet17
February 20251 release
  1. 24 Feb
    Claude 3.7 Sonnet15
October 20242 releases
  1. 22 Oct
    Claude 3.5 Haiku9
    Claude 3.5 Sonnet (Oct '24)8
June 20241 release
  1. 21 Jun
    Claude 3.5 Sonnet (June '24)7
March 20243 releases
  1. 4 Mar
    Claude 3 Haiku6
    Claude 3 Opus9
    Claude 3 Sonnet6
November 20231 release
  1. 21 Nov
    Claude 2.16
July 20231 release
  1. 11 Jul
    Claude 2.06
March 20231 release
  1. 14 Mar
    Claude Instant5

Release dates and intelligence scores from Artificial Analysis, cross-checked against vendor announcements. Follow new releases via RSS.

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