OpenAI Launches GPT-5.6 

OpenAI Launches GPT-5.6 

The new model family is now generally available after a limited preview. 

Three Models 

Sol, Terra and Luna 

Sol is the flagship, Terra is balanced, and Luna is the most cost-efficient tier. 

Coding Upgrade 

Stronger Coding Work 

OpenAI says GPT-5.6 Sol is its best coding model yet, with fewer tokens and faster results. 

Knowledge Work 

Better Documents and Decks 

GPT-5.6 is designed to turn messy work context into polished documents, slides and spreadsheets. 

Fast Model 

Luna Is Built For Speed 

Luna gives users and developers a lower-cost option for high-volume everyday AI tasks. 

API Feature 

Programmatic Tool Calling 

The Responses API can let GPT-5.6 coordinate tools and keep only the useful intermediate results. 

Max and Ultra 

More Capability On Demand 

Max gives more reasoning time, while ultra coordinates multiple agents for harder work. 

API Pricing 

Sol Starts At $5 Input 

Per 1M tokens: Sol $5/$30, Terra $2.50/$15, Luna $1/$6 for input and output. 

Safety 

Stronger Safeguards 

OpenAI says GPT-5.6 has layered protections, red teaming and risk-calibrated access. 

User Takeaway 

Pick The Right Tier 

Use Luna for speed, Terra for daily work and Sol for the toughest high-value tasks.