GPT-5.6 Sun, Earth and Moon – capabilities, prices, differences, business applications and practical implementation tips.

Technology analysis • July 2026 GPT‑5.6: Sol, Terra and Luna change the way AI models are chosen The new OpenAI series is not one model in three packages.

It is a cohesive family for work requiring maximum quality, daily business tasks, and large-scale automation.

Developed: July 17, 2026 • estimated reading time: about 10 minutes In short GPT‑5.6 Sol is the flagship model for the most complex problems.

Terra provides the best compromise between quality, speed, and cost.

Luna has been optimized for cheap, repeatable, high-volume operations.

All three models support text and images, reasoning, tools, and very long context.

OpenAI released the GPT‑5.6 family on July 9, 2026, in ChatGPT, Codex, and via API.

The most visible change is the new naming convention: instead of suffixes like "mini" and "nano," there are permanent tiers named Sol, Terra, and Luna.