Anthropic launches Claude Sonnet 4.5, its best AI model for coding, pushing the boundaries of what AI can do in software development. The new model is designed to deliver production-ready applications rather than just prototypes, marking a major step forward in reliability and scalability for developers.
Image Credits:Anthropic
The Claude Sonnet 4.5 model is now available through the Claude API and chatbot. Pricing remains consistent with Claude Sonnet 4: $3 per million input tokens and $15 per million output tokens, keeping access affordable for both individual developers and enterprise teams.
Why Claude Sonnet 4.5 Matters For Developers
Over the past year, Anthropic’s Claude models have become a favorite among software engineers, enterprises, and AI-first startups. Companies like Apple and Meta reportedly use Claude internally, while platforms such as Cursor, Windsurf, and Replit rely on its API for AI-powered coding applications.
Competition in the AI coding space has heated up, especially with OpenAI’s GPT-5 outperforming previous Claude models on certain benchmarks. But Anthropic believes Claude Sonnet 4.5 resets the bar, offering stronger reliability on long coding tasks and complex engineering projects.
Benchmark Performance And Early Results
Anthropic says Claude Sonnet 4.5 delivers industry-leading results on key coding benchmarks like SWE-Bench Verified. Still, researchers emphasize that benchmarks alone don’t capture its full capabilities.
David Hershey, an Anthropic AI researcher, shared that in early enterprise trials, Claude Sonnet 4.5 coded autonomously for up to 30 hours straight. During that time, it not only wrote application code but also:
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Set up database services
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Registered domain names
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Performed a SOC 2 audit for security compliance
This level of autonomy suggests that Claude Sonnet 4.5 is moving beyond basic code generation into end-to-end software engineering tasks.
Industry Voices On Claude Sonnet 4.5
Industry leaders are already praising the launch.
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Micheal Truell, CEO of Cursor, said Claude Sonnet 4.5 represents “state-of-the-art coding performance, especially for longer horizon tasks.”
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Jeff Wang, CEO of Windsurf, highlighted its potential to improve developer productivity and enterprise-grade reliability.
With such endorsements, Claude Sonnet 4.5 positions itself as a serious tool for enterprises looking to streamline development pipelines and reduce engineering costs.
The Bigger Picture For AI Coding
The launch of Claude Sonnet 4.5 reflects a broader trend: AI models are no longer just assistants but are becoming collaborators in building production-ready software. While competition from OpenAI and others remains fierce, Anthropic’s focus on safety, reliability, and enterprise use cases makes its models particularly appealing for businesses scaling AI adoption.
As more companies adopt AI-first workflows, tools like Claude Sonnet 4.5 could redefine how software development teams operate in 2025 and beyond.
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