Anthropic Launches Claude Sonnet 4.5 for Advanced Coding
The new model is claimed to be the "best coding model in the world" and capable of building production-ready applications.
A New Leader in Coding Performance
Anthropic on Sep 30, 2025, launched Claude Sonnet 4.5, which the company described as the “best coding model in the world.” The new model is designed for advanced coding, agentic systems, and computer use. In a blog post, Anthropic said the model is capable of building “production-ready” applications, a significant step beyond the prototyping capabilities of its predecessors.
The company highlighted industry-leading performance on coding benchmarks such as SWE-Bench Verified. For context, a September developer tool ranking from LogRocket placed Anthropic's previous Claude Opus 4.1 model at the top of its performance chart …
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