OpenAI on July 9, 2026 made its new "GPT-5.6 family" of models generally available. The lineup comprises the flagship "Sol," the balanced "Terra" and the lightweight "Luna," all accessible through ChatGPT, Codex and the OpenAI API.
July 9, 2026 · OpenAI
GPT-5.6 Goes Live: Three Models, One Bet on "Performance per Dollar"
The new family — flagship Sol , balanced Terra , and lightweight Luna — is now generally available across ChatGPT, Codex and the API, with OpenAI claiming it beats Anthropic's models on benchmarks while spending far less on tokens, time and cost.
80
Sol's Coding Agent Index — +2.8 over Fable 5
91.9%
Sol Ultra on Terminal-Bench 2.1 — Sol alone at 88.8%
53.6
Sol on Agents' Last Exam — +13.1 over Fable 5
Output price per 1M tokens
Sol holds a flagship price; Terra and Luna land substantially lower.
Input prices: Sol $5 · Terra $2.50 · Luna $1 per 1M tokens.
Efficiency edge vs Fable 5 · Coding Agent
Sol beats Fable 5 while burning far fewer resources.
Early praise
Partners call the models "tenacious" and high-quality with low token use
Notion: Terra & Luna match GPT-5.5 at half the price and 16% fewer tokens
Finance, legal & design report gains in accuracy and long-task endurance
Friction points
Phased rollout blocked immediate access for some users
Ultra mode's high token consumption raises cost concerns
Restrictions on cyber use cases; global rollout within 24 hours
The policy backstory
Because GPT-5.6's cybersecurity capabilities are strong, the Trump administration asked OpenAI to slow-roll the release , and a government approval process was involved during the preview stage. OpenAI says such an arrangement "should not become a long-term default."
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