Claude Sonnet 4.6 offers a superior balance of performance and cost-efficiency compared to Opus 4.6 for developers using the Claude Code Pro plan. Building a Shopify "Agent SEO" application—which audits product listings and compares them against competitors via the Catalog API—demonstrates that Sonnet 4.6 completes complex coding tasks 40% cheaper and slightly faster than its predecessor. While Sonnet performs fewer research cycles during the planning phase, it produces more detailed implementation plans and a more refined user interface with functional inline feedback for merchants. Despite minor hallucinations regarding why specific products rank well, the model successfully scaffolds and builds a functional application in approximately 30 minutes. Utilizing the 200k context window on the subscription plan, rather than the expensive 1 million token API, allows developers to maximize their usage limits while maintaining high-quality output for business use cases.
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