On 29 September 2025, Anthropic introduced Claude Sonnet 4.5, describing it as the most powerful AI coding model ever released. The company highlighted its outstanding capabilities in code generation, debugging, and complex software development tasks. Claude Sonnet 4.5 showed exceptional performance in languages such as Python, Java, and C++, and demonstrated the ability to comprehend and optimise large-scale code structures.
The new model outperformed Claude 3.5 in benchmark tests by 20–30%, while improving bug-fixing accuracy by 15%. Anthropic emphasised that Claude Sonnet 4.5 is suitable for use in research, industry, and education, aligning with the company’s long-term strategy to develop safer and more efficient generative AI systems.
The launch is significant not only from a technological perspective but also in market terms, as demand for AI coding models continues to grow rapidly. Anthropic’s new release could intensify global competition in the AI market—currently led by Microsoft and OpenAI—while setting new benchmarks for code quality and developer productivity.
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Ashley Capoot
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Maxwell Zeff
