What's great
Claude Sonnet 4.6 is the backbone of our entire platform, Humans.Team. Over 85 development sessions, Claude Code (powered by Sonnet) built 90% of our Next.js application — from Supabase database architecture and Row Level Security policies to AI journal integration, real-time notifications, PWA offline support, and a bilingual FR/EN system across 30+ pages.
What sets Sonnet 4.6 apart is its ability to hold deep context across long sessions. It remembers architectural decisions from hours ago, understands our codebase patterns, and writes production-ready TypeScript that rarely needs fixing. The reasoning is exceptional — it debugs complex issues by tracing through multiple files and connections.
We also use Claude Desktop daily for content strategy, press releases, blog articles, and bilingual copywriting. The nuance in both French and English is remarkable.
What needs improvement
Context window limits can be frustrating during very long sessions — the conversation gets compressed and some earlier decisions are lost. Also, occasional over-eagerness to add unnecessary abstractions or comments when a simple fix is all that is needed. But these are minor compared to the massive value it delivers daily.
vs Alternatives
We evaluated ChatGPT, GitHub Copilot, and Gemini. Claude won on three fronts: superior code quality with fewer hallucinations, exceptional long-context understanding (critical for our 85+ session codebase), and genuinely better bilingual output in French and English. The Claude Code CLI is a game-changer — it reads files, edits code, runs commands, and thinks through problems autonomously. Nothing else comes close for building a full-stack application from vision to production.