# Claude 3 Sonnet

> The middle Claude 3, and the one that was free on claude.ai — so through 2024, to everyone who had never held an API key, Claude meant this. Its model ID ends in 20240229, a leap day it shares with Opus and that neither of them was released on.

2024-03-04 — 2025-07-21 · lived 1 year, 4 months

This URL is the guided walk — the 3D cemetery, standing at this grave. The written record is at [Claude 3 Sonnet's epitaph](https://models.rip/claude-3-sonnet/epitaph).

## Elsewhere

- [The whole cemetery](https://models.rip/)
- [The dataset](https://models.rip/graveyard.json)