Claude 4 is here, and developers are putting it to the test. This video skips the benchmarks and dives into real-world builds—like an Instagram clone and a multiplayer Tic-Tac-Toe app—using Claude 4 with Convex and Chef. If you’re deciding between Claude 4 and 3.5 for agentic codegen, backend setup, or Convex-based workflows, this walkthrough shows the good, the bad, and the frustrating.