# Collaborating with Anthropic on Claude Sonnet 4.5 to power intelligent coding agents By Steven Van · 2025-09-29 Vercel adds Claude Sonnet 4.5 to AI Gateway and launches an open-source Coding Agent Platform template built on it. Claude Sonnet 4.5 is now live on [Vercel]() AI Gateway with full support in the AI SDK. Vercel has been testing the model in v0, in its Next.js build pipelines, and in a new Coding Agent Platform template, and reports gains in design sensibility and code quality when building and linting Next.js applications. - On Next.js builds, Vercel says the model has higher first-pass success rates and fewer missing dependency errors, correctly inferring which packages to add to package.json before builds run. - It shows stronger adherence to Next.js and ESLint defaults, and better handling of framework-specific functionality such as using Image from next/image. - In v0, Vercel reports cleaner component structures, better Tailwind usage, more accessible UI patterns, and better handling of complex prompts and applications like 3D worlds, often in a single attempt. Alongside the model, Vercel released a [Coding Agent Platform]() template that defaults to Anthropic's Claude Code agent running Claude Sonnet 4.5, alongside support for OpenAI Codex CLI, Cursor CLI, and opencode. After connecting a GitHub organisation, a user picks a repository and defines a task; the agent plans, executes, and commits changes inside an isolated Vercel Sandbox, then opens a pull request for review. The template is open-sourced so teams can fork, audit, and extend it. [![]()]() ![Vercel]() Vercel The platform for frontend developers — deploy, preview, and scale web apps and AI agents with zero config. [View Vercel →]() [Original source]() [Read Collaborating with Anthropic on Claude Sonnet 4.5 to power intelligent coding agents on Creators Toolbox]() --- Canonical source: https://creatorstoolbox.com/blog/vercel-collaborating-with-anthropic-on-claude-sonnet-4-5-to-power-intelligent