Which LLM writes the best code? Convex Chef model comparison

Convex compared Claude 3.5 Sonnet, GPT-4.1, and Gemini 2.5 Pro to see which LLM works best for building full-stack apps with Convex Chef, the new AI Agent app developer tool. Claude stood out for its precise backend coding and function calling, while Gemini made impressive UIs, and GPT offered solid speed and value.