"On Monday, Anthropic released Claude Sonnet 4.5, a new AI language model the company calls its "most capable model to date," with improved coding and computer use capabilities. The company also revealed Claude Code 2.0, a command-line AI agent for developers, and the Claude Agent SDK, which is a tool developers can use to build their own AI coding agents."
"Anthropic says it has witnessed Sonnet 4.5 working continuously on the same project "for more than 30 hours on complex, multi-step tasks," though the company did not provide specific details about the tasks. In the past, agentic models have been known to typically lose coherence over long periods of time as errors accumulate and context windows (a type of short-term memory for the model) fill up."
Anthropic released Claude Sonnet 4.5, a mid-range AI language model with improved coding and computer-use 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. Anthropic reported Sonnet 4.5 working continuously on a single project for more than 30 hours on complex, multi-step tasks, while declining to provide task specifics. Agentic models historically lose coherence over long runs as errors accumulate and context windows fill. Anthropic produces three Claude sizes—Haiku, Sonnet, Opus—balancing performance, cost, and speed, with Sonnet serving as the cost-effective sweet spot.
Read at Ars Technica
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