Claude Sonnet 4 is the smaller model, but it's still a major upgrade in power from the earlier Sonnet 3.7. Anthropic claims Sonnet 4 is much better at following instructions and coding.

Sonnet 4 is similar, but tuned for reasoning and balanced for efficiency – meaning it's less expensive to run. Claude's latest duo arrives amid a flurry of model updates from rivals.

According to Anthropic, Claude Sonnet 4 is a significant upgrade to Claude Sonnet 3.7, offering improved coding and reasoning along with the ability to respond to instructions more precisely.

Free users of Claude can only access the new Sonnet 4 model. However, Pro, Max, Team, and Enterprise Claude plan users can access both models and extended thinking.

It balances power and efficiency, making it suitable for various uses. While not as powerful as Opus 4, Sonnet 4 offers a great mix of capability and practicality, with enhanced control over its ...

Anthropic released Claude Opus 4 and Sonnet 4, the newest versions of their Claude series of LLMs. Both models support extended thinking, tool use, and memory improvements, and Claude 4 Opus outperfor ...

Anthropic announced Claude Opus 4 and Claude Sonnet 4 on Thursday, touting the advanced ability of the models to "analyze thousands of data sources, execute long-running tasks, write human-quality ...