OpenAI has unveiled its newest family of models, introducing a powerful suite of programs into the increasingly competitive landscape of artificial intelligence offerings.
The GPT-5.6 series comes in three distinct versions: Sol, designated as its primary workhorse; Terra, an intermediate option; and Luna, designed as a budget-friendly choice. These models are engineered to expand user capabilities across diverse fields, with the company promising robust potential in enterprise work, software development, and even scientific research.
CEO Sam Altman has affirmed that his company’s latest models are significantly more efficient and cost-effective than previous iterations. He recently told CNBC that Sol, in particular, demonstrates a 54% improvement in token efficiency for AI coding tasks.
Notably, the company describes GPT-5.6 as its “strongest cybersecurity model yet, achieving frontier performance with significantly fewer tokens.”
Indeed, the model's cybersecurity capabilities have generated considerable discussion, especially since the Trump administration previously sought to restrict its deployment, citing concerns over potential misuse. GPT-5.6 is designed to support defensive activities, including threat modeling, code review and patching, and blue teaming—a process of simulating attacks on one's own systems to identify weaknesses before real hackers can exploit them.
OpenAI also launched a new tool named ChatGPT Work, which, as its name suggests, is conceived as a workplace companion for enterprise teams. Available on desktop, web, and mobile, it is designed to assist with daily administrative tasks such as drafting documents, spreadsheets, and presentations.
The announcement of OpenAI’s new model family closely follows similar releases this week from rival companies, including SpaceXAI and Meta.
However, GPT-5.6 and its associated marketing strategy appear largely aimed at OpenAI’s primary competitor, Anthropic. Anthropic has successfully positioned itself as the "likable underdog" in the AI race, consistently focusing on enterprise customers and, as a result, securing a growing share of market support.
Not to be outdone, OpenAI cites the Artificial Analysis Coding Agent Index, a respected benchmarking metric, to assert that its latest family of models consistently outperforms Anthropic’s offerings.
OpenAI has declared Sol its “best coding model yet,” explicitly comparing it to Anthropic’s recently released and highly anticipated Fable. Using the Coding Agent Index, OpenAI claims that Sol “sets a new state of the art at 80, 2.8 points above Fable 5, while using less than half the output tokens, taking less than half the time, and costing about one-third less.”
The company further adds: “That advantage extends across the family: Terra performs just above Fable 5, while Luna outperforms Opus 4.8.”
GPT-5.6 is now available across ChatGPT, Codex, and the OpenAI API. Pricing per million tokens is structured as follows: Sol is $5 for input and $30 for output, Terra is $2.50 for input and $15 for output, and Luna is $1 for input and $6 for output.
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