OpenAI Launches GPT-5.6 Family With Three Models and Adjustable Reasoning Controls

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OpenAI has released the GPT-5.6 model family — Sol, Terra, and Luna — across ChatGPT, Codex, and its API, with each model targeting different cost and performance needs. Free and Go tier users receive Terra as their default, while paid subscribers on Plus, Pro, Business, and Enterprise plans can choose across all three models. A key feature of the rollout is user-configurable reasoning effort, allowing paid users to set how much reasoning a model applies to a given task, with a maximum setting available in some contexts. Free and Go users also gain access to reasoning options where supported, though availability depends on the interface and rollout stage. Developers using the API can access all three GPT-5.6 models independently of ChatGPT plan restrictions, enabling workload-specific evaluation.

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