OpenAI has significantly reduced the pricing for its GPT-5.6 model family, introducing a massive 80% price drop for GPT-5.6 Luna and a 20% reduction for GPT-5.6 Terra. These changes are enabled by GPT-5.6 Sol, which optimizes the model's forward pass and production kernels to improve efficiency.

  • GPT-5.6 Luna is now priced at $0.20 per million input tokens and $1.20 per million output tokens.
  • This pricing makes Luna cheaper than Google's Gemini 3.1 Flash-Lite for input costs.
  • Luna is approximately one-fifth the cost of Anthropic's Claude Haiku 4.5 for input tokens.
  • GPT-5.6 Sol autonomously rewrote and optimized production kernels in Triton and Gluon, reducing end-to-end serving costs by 20%.

The drastic price reduction positions Luna as a highly competitive option for lower-cost inference tasks, prompting users to switch from more expensive alternatives like Gemini 3.1 Flash-Lite.