# Claude Sonnet 4

> The middle of the Claude 4 pair, priced to be the default rather than the decision, and the model that made an agent running for an hour something you would start without first thinking about the bill. It lasted thirteen months and went on the same day as the Opus it had shipped beside — a whole generation buried at once.

2025-05-22 — 2026-06-15 · lived 1 year

Buried here: `claude-sonnet-4-20250514`

## The record

- Provider: Anthropic
- Model id: `claude-sonnet-4-20250514`
- Cause of death: Superseded
- Notice given: 2026-04-14

## Sources

- https://platform.claude.com/docs/en/about-claude/model-deprecations
- https://www.anthropic.com/news/claude-4

## Elsewhere

- [Stand at this grave](https://models.rip/claude-sonnet-4)
- [The Anthropic plot](https://models.rip/anthropic)
- [The whole cemetery](https://models.rip/)