Claude Sonnet 5.5 vs Grok Build 0.1

Anthropic's Sonnet model in the Claude 5.5 family, built for fast, well-scoped everyday work. Sonnet 5.5 improves on Sonnet 5 across coding, writing, and knowledge work, and often finishes the same task in fewer steps. It reads text, images, and PDFs, holds a very large context, and reasons with adjustable effort. Anthropic highlights its clearer writing and its sharp eye for design.

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.