GPT-5.6 in Codex: the next bottleneck is launch, not code

GPT-5.6 Sol, Terra, and Luna are becoming the center of the coding-agent conversation this week.

The important question is not only whether Sol is better at hard coding tasks, or whether Luna is cheaper for repetitive work. The more useful question is what happens after the agent produces a working app.

For many builders, the pattern is already familiar:

A coding agent builds a convincing demo.

The local app works.