The AI Daily Brief · Monday, June 29, 2026
OpenAI has released GPT-4.6, comprising three models: Sol (frontier), Tera (balanced), and Luna (fast/affordable). Similar to Mythos, these models are initially available only to a small group of trusted partners at the request of the US government.
“GPT-4 is actually three models: Sol, which they call their next generation frontier model, as well as 5.6 Tera, a balanced model for efficient everyday work, and 5.6 Luna, a fast and affordable model for high volume work.”
“As part of our ongoing engagement with the US government, we previewed our plans and the model's capabilities ahead of today's launch. At their request, we are starting with a limited preview for a small group of trusted partners whose participation has been shared with the government before releasing more broadly.”
“We don't believe this kind of government access program should become the long-term default. It keeps the best tools from users, developers, enterprises, cyber defenders, and global partners who need them.”