OpenAI has announced significant price reductions for its GPT-5.6 model family, cutting the cost of GPT-5.6 Luna by 80 percent and GPT-5.6 Terra by 20 percent. The company frames these changes as part of a broader strategy to make advanced AI more affordable and widely useful through improved infrastructure efficiency.
- GPT-5.6 Luna now costs $0.20 per million input tokens and $1.20 per million output tokens.
- GPT-5.6 Terra is priced at $2 for input and $12 for output per million tokens.
- GPT-5.6 Sol Fast mode offers up to 2.5 times the speed of standard processing at twice the price.
- Engineering optimizations using GPT-5.6 Sol reduced end-to-end serving costs by 20 percent and increased token-generation efficiency by more than 15 percent.
- Improvements to retained reasoning and context management raised GPT-5.6 Sol’s ARC-AGI-3 score from 13.3 percent to 38.3 percent while using six times fewer output tokens.
These adjustments aim to expand the range of practical work for customers by lowering the cost of successful outcomes, allowing users to better balance intelligence, speed, reliability, and expense.