# Claude Sonnet 4 Link:: [Wikipedia Entry]() > [!about] According to Wikipedia >**Claude** is a family of [large language models](https://en.wikipedia.org/wiki/Large_language_model "Large language model") developed by [Anthropic](https://en.wikipedia.org/wiki/Anthropic "Anthropic"). The first model, Claude, was released in March 2023. Claude 4, which includes Opus and Sonnet, was released in May 2025. ## Notes