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Cloudflare engineering director Steve Faulkner used Anthropic's Claude via the OpenCode AI coding agent to implement 94% of the Next.js API in roughly one week, spending about $1,100 on tokens. The resulting open source project, Vinext, replaces Next.js's Turbopack bundler with Vite to sidestep Vercel platform lock-in and enable easier deployment to Cloudflare Workers and other targets. The AI-generated code was guided by the existing Next.js test suite, though no human has reviewed it yet. Vinext shows promising benchmarks — up to 4.4x faster builds and 56% smaller client bundles than Next.js 16 with Turbopack. Faulkner notes that human oversight was still critical for course-correction, and raises broader questions about AI-generated codebases that no human fully understands.

Cloudflare vibe codes 94% of Next.js API 'in one week'