OpenAI releases GPT-5.6 Sol, Terra, and Luna models

OpenAI has released its new GPT-5.6 model family, introducing the high-performance "Sol" tier alongside the more affordable "Terra" and "Luna" options.

• Sol is priced at $5/$30, while Terra costs $2.50/$15 and Luna is $1/$6.
• OpenAI claims Sol sets a new standard in agents, coding, cybersecurity, and science benchmarks.
• Internal metrics show average daily output tokens per active researcher more than doubled compared to GPT-5.5 during testing.
• The article contrasts Sol with the "Fable" model, describing Fable as having superior raw intelligence and alignment, while Sol is positioned as a practical workhorse for execution tasks like computer use and web search.

The release aims to provide enterprises with cost-effective options for AI tasks, with Sol targeting high-complexity work and Terra/Luna offering lower-cost alternatives.