Last updated: August 22, 2026 — verified against current OpenAI product and Help Center documentation. ChatGPT is no longer best understood as a single model. In 2026, OpenAI separates the product into different experiences and model tiers: everyday Chat, longer-running Work, software-focused Codex, and the GPT-5.6 model family led by Sol, Terra and Luna. Which … Continue reading ChatGPT Models Explained (2026): Complete Guide to OpenAI’s AI Models