OpenAI releases GPT-5.6 model family featuring Sol, Terra and Luna variants for enterprise and coding tasks
OpenAI has launched the GPT-5.6 model family featuring Sol, Terra, and Luna variants designed to improve efficiency and cost-effectiveness for enterprise and coding applications.
1. OpenAI Model Launch
On July 9, 2026, OpenAI introduced a new family of models, GPT-5.6, consisting of three variants: Sol, Terra, and Luna. Designed for enterprise, coding, and research applications, the models are marketed as significantly more efficient and cost-effective than their predecessors. CEO Sam Altman noted that the Sol variant is 54% more token-efficient for coding tasks. Additionally, OpenAI released ChatGPT Work, a tool intended to assist enterprise teams with clerical tasks such as document drafting and presentation creation.
2. Cybersecurity and Competitive Positioning
OpenAI has highlighted the cybersecurity capabilities of the GPT-5.6 family, which supports threat modeling, code patching, and blue teaming. The release follows government interest in the model's potential misuse, leading to earlier rollout restrictions. OpenAI is positioning these models to compete directly with Anthropic, citing the Artificial Analysis Coding Agent Index to claim that Sol outperforms Anthropic’s Fable 5 model while using fewer tokens and costing approximately one-third less.
3. Pricing and Availability
The GPT-5.6 models are currently available via ChatGPT, Codex, and the OpenAI API. Pricing is structured per million tokens: Sol is priced at $5 for input and $30 for output; Terra is $2.50 for input and $15 for output; and the budget-friendly Luna is $1 for input and $6 for output. This launch coincides with a broader period of industry activity, including the release of Meta’s Muse Spark 1.1 and updates from SpaceXAI.