On Monday, Anthropic launched a new frontier model called Claude Sonnet 4.5 , which it claims to offer state-of-the-art performance on coding benchmarks. The company says Claude Sonnet 4.5 is capable of building “production-ready” applications, rather than just prototypes, representing a leap in reliability from previous AI models.

Claude Sonnet 4.5 will be available via the Claude API and in the Claude chatbot. The pricing for developers is the same as Claude Sonnet 4: $3 per million input tokens (roughly 750,000 words, or more than the entire Lord of The Rings series) and $15 per million output tokens.

In the last year, Anthropic’s AI models have emerged as a favorite among developers and enterprises, in large part due to their strong performance on software engineering tasks. Appl

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