Collaborating with Anthropic on Claude Sonnet 4.5 to power intelligent coding agents

This post introduces the integration of Claude Sonnet 4.5 into Vercel's AI Gateway and AI SDK, highlighting its performance improvements for agentic coding workflows, particularly with Next.js applications. It details specific metrics for Next.js builds and linting, and improvements in v0 for frontend design and complex prompt handling. The post also announces the release of an open-source Coding Agent Platform template that defaults to Claude Code agent using Claude Sonnet 4.5, enabling agents to plan, execute, and commit changes within repositories. The template runs on Vercel Sandbox for isolated execution and Fluid Compute for scalability, with Active CPU pricing. The contribution focuses on showcasing the practical application of an advanced LLM for automated software development tasks and providing a reference implementation for developers.