Sonnet 4.5

Claude 4.5 Sonnet (often referred to as part of the "4.5" generation of capabilities) is Anthropic's flagship balanced model. It set a new standard for coding proficiency, visual reasoning, and nuance, outperforming many larger models.

It is widely considered the developer's choice for building reliable, complex agentic workflows due to its superior instruction-following and "Computer Use" capabilities.