🪦 Dead

Claude 3.5 Sonnet

Model deprecation · Model Deprecation · shut down October 28, 2025

Born: June 20, 2024
Died: October 28, 2025
Lifespan: 1y 4m
Cause of death: Model Deprecation
Killed by: Anthropic
Type: Model

Anthropic's breakout model that briefly topped every benchmark and became the most popular coding AI. Retired just 16 months after launch as Claude Sonnet 4 took its place — a testament to the breakneck pace of AI model evolution.

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Questions about Claude 3.5 Sonnet

Is Claude 3.5 Sonnet dead?

Yes. Claude 3.5 Sonnet was shut down on October 28, 2025, 1y 4m after its launch on June 20, 2024. The cause of death was model deprecation; it was killed by Anthropic. Classification: model deprecation. Details and the source are above.

Claude 3.5 Sonnet

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