Claude Sonnet 5 Deep Dive: Agents, Effort, Benchmarks, and Real Cost
Anthropic released Claude Sonnet 5 on 2026-06-30, bringing stronger long-horizon execution and tool use to the Sonnet tier. Using its 146-page system card, official docs, CursorBench, and Artificial Analysis, this analysis covers effort, tokenization, benchmarks, safety, and real task cost.