Sonnet 4.5

Claude Sonnet 4.5 is built to be the everyday workhorse in Anthropic’s lineup. It follows instructions cleanly, plans its steps on harder problems, and explains choices with steady logic, so you can trust it for complex analysis, math, and repository-scale coding without the latency of the heaviest tier. The model accepts images alongside text for document, chart, and screenshot understanding, then returns grounded, well-structured answers that hold up in production. It streams responses for conversational UX, calls tools and functions with precise arguments, and emits deterministic JSON when automations require strict schemas. Long-context handling keeps multi-document prompts coherent, retrieval grounding reduces hallucination, and alignment tuning maintains safe, controllable behavior. Teams adopt Sonnet 4.5 as their default engine—routing only the most demanding tasks to a larger model—because it balances accuracy, speed, and cost while fitting neatly into modern agent and RAG pipelines.