Nundina › Discover calendars › Version End-of-Life Dates calendar › Claude Opus 5.5 end of life (earliest)Claude Opus 5.5 end of life (earliest)22 September 2027Claude Opus 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 22 Sep 2026. Source: endoflife.date.Version End-of-Life Dates calendarMore from this calendar

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