OpenAI makes two GPT-5.6 models cheaper, expanding usage in ChatGPT

OpenAI cut API prices for its GPT-5.6 Terra and Luna models.

Terra is now 20% cheaper and Luna 80% cheaper than earlier this month.

The company also changed how these models count toward ChatGPT Work and Codex subscriptions, allowing more usage before limits hit.

The moves make OpenAI’s newer models cheaper for developers and easier to use for subscribers.