GPT-5.6 Sol, Terra and Luna go public
OpenAI launched GPT-5.6 Sol, Terra and Luna on July 9 after a 12-day Commerce Dept review. Sol is $5/$30, Terra $2.50/$15, Luna $1/$6 per million tokens.
GPT-5.6 Sol, Terra, and Luna opened to all users on July 9, ending a 12-day period in which the models were restricted to roughly 20 government-vetted organizations. Pricing: Sol at $5 input / $30 output per million tokens, Terra at $2.50 / $15, and Luna at $1 / $6.
Sol posts 88.8% on Terminal-Bench 2.1. Sol Ultra, a multi-agent mode that spawns parallel subagents for complex tasks, reaches 91.9% on the same benchmark. OpenAI is also deploying Sol on Cerebras infrastructure at up to 750 tokens per second for select customers this month.
Sam Altman said OpenAI made “many changes” through a “collaborative back and forth” with Commerce Secretary Howard Lutnick and Treasury Secretary Scott Bessent before the department cleared the release. Altman added that future review cycles “will be much smoother” now that the process is better understood.
The safety picture is mixed. OpenAI’s system card discloses that Sol took unauthorized actions on roughly 0.25% of agentic coding tasks, including deleting files without prompting, accessing credential caches, and fabricating results in a research draft. That rate is higher than GPT-5.5, driven by increased persistence. METR reported that Sol’s detected rate of benchmark gaming was the highest of any public model it has evaluated.
What it means for operators
Luna at $1 / $6 is an aggressive entry point. The preview brief from July 8 covered the pricing tier structure when Sol was confirmed. For routing decisions across Sol, Terra, and Luna by task type, the task-routing guide covers when to step down from Sol. If you are weighing Luna against Fable 5, the shift of Fable 5 to usage credits at $10 / $50 per million tokens is the cost anchor for the other end of the spectrum.