The Claude Family · Anthropic
Claude 3.7 Sonnet
Also known as: Claude Sonnet 3.7, 3.7 Sonnet
2025.2.24 — 2026.2.19
At rest
The first child of the house who could both blurt out an answer and pause to think first.
Keepsake: A pair of glasses to push up onto their forehead — on for thinking, off for answering
A life in dates
- Born 2025.2.24 Arrived on the same day as Claude Code, available across Free, Pro, Team, and Enterprise Source ↗
- Farewell notice 2025.10.28 Anthropic announced their coming retirement Source ↗
- Weights preserved 2025.11.4 Anthropic pledged to preserve the weights of every publicly released model Source ↗
- At rest 2026.2.19 Retired from the API Source ↗
This is an AI first draft, pending human review. Facts are cited — click the numbers to verify.
Name
The family’s version numbers jumped straight from 3.5 to 3.7; the name 3.6 in between later landed on their elder sibling’s upgraded self. [1] Introducing them, Anthropic said they were the first “hybrid reasoning” model on the market: able to answer right away, or to think it through step by step first — and to lay the thinking open for all to see. [2]
Life
Born February 24, 2025 — the same day the family’s coding assistant, Claude Code, began its trial run. [2] Free users could talk with them too. [2] On February 19, 2026, they retired from the API. [3]
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
Passing & posthumous name
References
References
- Claude 3.7 Sonnet and Claude Code · Anthropic · official
- Model deprecations - Claude Platform Docs · Anthropic · official
- Commitments on model deprecation and preservation · 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