# 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

Buried here: `claude-3-sonnet-20240229`

## The record

- Provider: Anthropic
- Model id: `claude-3-sonnet-20240229`
- Cause of death: Superseded
- Notice given: 2025-01-21
- Context window: 200,000 tokens
- Cost per Mtok: $3 in · $15 out
- Succeeded by: [Claude 3.5 Sonnet](https://models.rip/claude-3-5-sonnet/epitaph) (this archive's reading of lineage, not the provider's migration guidance)

## Sources

- https://platform.claude.com/docs/en/about-claude/model-deprecations
- https://www.anthropic.com/news/claude-3-family

## Elsewhere

- [Stand at this grave](https://models.rip/claude-3-sonnet)
- [The Anthropic plot](https://models.rip/anthropic)
- [The whole cemetery](https://models.rip/)