OpenAI is rolling out GPT-5.6 across ChatGPT, Codex, and its API, introducing a new three tier model family led by Sol, its latest flagship model.
The lineup also includes Terra, a balanced model for everyday work, and Luna, the company’s lowest cost option in the GPT-5.6 family. OpenAI says the new naming system separates the model generation from durable capability tiers, giving users and developers clearer choices across intelligence, speed, and cost.
The release follows a limited preview and expands access to GPT-5.6 across OpenAI’s consumer, developer, and enterprise products. The rollout is starting globally and is expected to continue toward full availability over 24 hours.
OpenAI is positioning GPT-5.6 Sol as its strongest model for coding, knowledge work, cybersecurity, and science. The company says the model delivers better performance per dollar by completing more successful work with fewer tokens and lower estimated cost than previous frontier models.
The company says Sol can coordinate tool use, inspect intermediate results, and refine outputs before returning finished work. In the API, Programmatic Tool Calling lets the model write and run lightweight programs in memory to filter intermediate data and decide next steps without sending every result back through the model.
