The provided sources announce and review the launch of Anthropic's Claude Sonnet 4.5 large language model, positioning it as the company's most advanced tool, particularly for coding and complex agentic workflows. Multiple articles and a Reddit discussion highlight its superior performance on coding benchmarks like SWE-Bench Verified, claiming it often surpasses the flagship Opus model and competitors like GPT-5 Codex, while also being significantly faster. Key new features discussed include its capacity for extended autonomous operation (over 30 hours), enhanced tool orchestration, a new Claude Agent SDK for developers, and the experimental "Imagine with Claude" feature for on-the-fly software generation. Feedback suggests that the model is more "steerable" and reliable, making it function effectively as an "AI colleague" for enterprise software developers.

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