GPT-5.6
large language model by OpenAI
GPT-5.6 (Generative Pre-trained Transformer 5.6) is a set of large language models (LLMs) developed by OpenAI and released on July 9, 2026. It is a family of models that comes in three distinct variants, ranked from least to most capable: Luna, Terra, and Sol. The models were designed to expand user capabilities across enterprise work, coding, scientific research, and cybersecurity.
Due to government restrictions levied by the Donald Trump administration, GPT-5.6 was first released as a limited preview only on June 26, 2026 for "small group of trusted partners", despite the planned public rollout in the same month.
On August 10, 2026, GPT-5.6-Cyber was launched with Daybreak Blue and Red, and it solved and completed 95% of cybersecurity problems.
On August 11, 2026, Astra now has "universal monitoring for risky actions and misalignment," with monitors watching over its "chain of thought" in order to stop the model if it starts to move into high risk activity.
Models and variants
GPT-5.6 is available in three variants, called Sol, Terra and Luna, each tailored to different performance and cost requirements. The flagship model, called Sol, is described by OpenAI as its "workhorse" and "best coding model yet" suited for complex reasoning, coding and agentic workflow. Terra is the intermediate version, capable lower-cost option that is competitive with its predecessor (GPT-5.5) while being half the cost, and Luna is the fastest and most budget-friendly option in the family.
OpenAI introduced GPT-5.6 with a focus on token efficiency.
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This entry incorporates text from “GPT-5.6” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.