OpenAI will launch GPT‑5.6 today, adding three new tiers—Sol, Terra, and Luna—to its model lineup. The tiers line up on a durability‑speed‑cost spectrum, with Sol as the flagship, Terra as a balanced daily‑work model, and Luna as a fast, budget option. The new naming scheme ties the generation number to the tier, giving developers clearer choices.

The announcement also introduces ChatGPT Work, a standalone desktop, mobile, and web app that bundles the core ChatGPT experience with Codex. Codex now powers the desktop app on macOS and Windows, letting users edit Markdown, run code, and review GitHub pull requests directly in the interface. The updated app supports inline annotations, repository‑wide projects, and a simplified plugin manager.

These moves tighten the product ecosystem: Codex workflows merge with ChatGPT, and paid users gain a hosted‑sites feature. For consumers, the tiered models offer predictable performance and cost curves; for the industry, the unified platform may accelerate AI‑assisted coding and productivity tools.