Scales flexibly
Compute ramps with task difficulty — cheaper on simple tasks, deeper on complex ones.
Frontier intelligence that scales with your goals · Sol / Terra / Luna
GPT-5.6
More intelligence packed into every token, better price-performance, and three tiers — Sol, Terra and Luna — from flagship reasoning to high-volume work.
- Provider
- OpenAI
- Access
- Unified API
Model overview
GPT-5.6 is OpenAI's flagship model built for ambitious goals. It scales its effort with task difficulty, packing more intelligence into every token while holding strong price-performance and reserving a higher capability ceiling for the most demanding reasoning and coding tasks.
It comes as a family of three tiers: Sol is the flagship for complex reasoning and coding, strongest across coding, knowledge work, cybersecurity and science; Terra is the balanced tier for everyday work; Luna is the fastest and cheapest, aimed at cost-sensitive, high-volume workloads and roughly matching the nano tier of earlier GPT-5 families.
Through XylemNode, a single API key lets you call it directly from editors, the command line and any client — with no separate OpenAI integration.
Key capabilities
Three tiers
Sol for the hard problems, Terra for everyday work, Luna for volume — same interface, switch by budget and job.
Better per dollar
More effective intelligence from the same budget, ideal for high-frequency, at-scale calls.
Specs
Bring this model into your workflow