Anthropic says its new AI model “maintained focus” for 30 hours on multistep tasks

Anthropic has unveiled its latest AI model, Claude Sonnet 4.5, which the company touts as its most advanced model yet, featuring enhanced coding and computer usage capabilities. The company also introduced Claude Code 2.0, a command-line AI agent for developers, and the Claude Agent SDK for building custom AI coding agents. Notably, Anthropic claims that Sonnet 4.5 demonstrated sustained focus on complex, multistep tasks for over 30 hours, a significant improvement over previous models that tended to lose coherence over time. The Claude family includes models of varying sizes – Haiku, Sonnet, and Opus – with Sonnet striking a balance between contextual depth and operational efficiency.