Anthropic Claude 4.5 Sonnet

Claude Sonnet 4.5 positions itself as Anthropic's most intelligent model built specifically for agentic work and coding. The model is engineered to work independently for hours, maintaining clarity while orchestrating tools and coordinating multiple agents to solve complex problems. Its design intent centers on excelling at long-horizon software projects that span hours or days, handling cybersecurity automation where agents can patch vulnerabilities proactively, conducting financial analysis from entry-level to advanced predictive tasks, and accelerating research workflows that need to deliver ready-to-go office files. The model shows substantial gains in reasoning and math, making it capable of the kind of hard problem-solving that modern work increasingly demands.

The model builds on prior Claude iterations with demonstrable performance improvements, achieving state-of-the-art results on coding benchmarks like SWE-bench Verified according to available evaluation data. Anthropic has equipped it with an Agent SDK—the same tooling that powers Claude Code—giving developers the building blocks to create autonomous coding agents. The model hits a favorable price-to-performance sweet spot, delivering strong capabilities for production workloads without the cost overhead of flagship tier models. For organizations deploying AI agents at scale, Claude Sonnet 4.5 serves as a practical default choice that balances speed, intelligence, and cost efficiency for complex agentic tasks.