Claude Sonnet 4.5 (latest)

Claude Sonnet 4.5 belongs to Anthropic's claude-sonnet family of large language models, positioned as a mid-tier generation within the lineup. It is designed to handle natural language reasoning tasks alongside programming-oriented workflows, continuing the family's emphasis on agentic coding assistance and developer-oriented tool integration that earlier Sonnet variants helped establish.

In practical terms, the model is intended for users who need a balance between capable reasoning and responsiveness across text-based tasks, with optional image and PDF inputs to support document-grounded interactions. Its qualitative strengths typically align with those reported for the Sonnet family more broadly, including structured multi-step problem solving, code generation and review, and reliable tool calling for agent-style workflows.