Claude Sonnet 5 vs Grok Build 0.1

The all-rounder in the Claude family, and a sensible default for most work. Sonnet 5 codes, writes, and analyses across the same ground as the flagship, reads images and documents, and holds the same very large context. It is faster and costs less. It gives up ground only on problems difficult enough to need the flagship.

xAI's coding model, purpose-built for autonomous software engineering rather than chat. Grok Build 0.1 acts as an engineering agent: it reasons through a problem, writes code, runs your terminal, checks for errors, and fixes its own mistakes in a loop. It reads text and images, always reasons before answering, and natively supports Model Context Protocol. Built for long-horizon coding that runs with little supervision, at a low cost, tuned for agent loops.