Nundina › Discover calendars › Version End-of-Life Dates calendar › Claude Sonnet 5.5 end of life (earliest)Claude Sonnet 5.5 end of life (earliest)28 September 2027Claude Sonnet 5.5 stops receiving security updates. The vendor publishes this as the earliest possible date rather than a commitment, so it may move later. Released 28 Sep 2026. Source: endoflife.date.Version End-of-Life Dates calendarMore from this calendar

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