Build a Self-Verifying Agent With Grok 4.6 in Python

xAI shipped Grok 4.6 on August 12, 2026, and the headline for developers is not the benchmark table. It is a behavior change: during long agentic runs, the model now verifies its own work before moving to the next step. It runs the test it just wrote, re-reads the file it just edited, and self-corrects instead of barreling ahead on an unchecked assumption. xAI calls this self-verification, and it is the single most useful thing to build around.