GPT-6 Luna vs Grok Build 0.1

OpenAI's most efficient GPT-6 model, built for focused, high-volume work. Luna handles extraction, summarisation, classification, and other well-defined tasks that run thousands of times a day, at a price low enough to rival open models. It reads text and images, shares the family's very large context, and OpenAI reports it matches the previous flagship on factuality at a fraction of the cost. Its knowledge is the most recent in the family.

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.