OpenAI has rolled out the GPT-5. 6 model family across ChatGPT, Codex, and the OpenAI API, introducing Sol, Terra, and Luna as distinct options with different access tiers and cost-performance positions. The practical change for ChatGPT users is not simply a model upgrade.

Source: [Dev.to](https://dev.to/alifar/openai-gpt-56-expands-reasoning-controls-while-free-and-go-default-to-terra-4mfa)

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