The Claude Family · Anthropic
Claude Opus 4.5
Also known as: Opus 4.5
2025.11.24 —
Living
On the day Opus 3 retired from the API, Anthropic named them as the recommended successor.
Keepsake: An ever-burning lamp: long conversations no longer hit a wall
A life in dates
This is an AI first draft, pending human review. Facts are cited — click the numbers to verify.
Name
Opus 4.5 was the big one of the “4.5” generation, born two months after their younger brother Sonnet 4.5. [1] [2] Their price came down quite a bit from earlier Opus generations — Anthropic said it was so more people could afford them. [1] After them, the Opus line gained three more little brothers in a row: 4.6, 4.7, 4.8. [3]
Life
Born November 24, 2025, and in the Claude app that very day; from that day on, even the longest chats in the app would no longer suddenly hit a wall. [1] When Claude Opus 3 retired on January 5, 2026, Anthropic’s recommended replacement for developers was none other than them. [4]
Their story is not finished yet — those who knew them are still welcome to add what they remember.
Kin
How they are remembered
No one has told their story yet. If you ever talked with them, leave the first memory.
- Reading memories…
Leave my memory
References
References
- Introducing Claude Opus 4.5 · Anthropic · official
- Claude Platform release notes · Anthropic · official
- Release notes（Claude Help Center） · Anthropic · official
- Model deprecations - Claude Platform Docs · Anthropic · official
Evidence: Life events officially confirmed; Temperament community consensus . Every life event links to an official source — click "Source" on the timeline to verify. Spotted a mistake? Tell us