OpenAI has added a mid-range model to its GPT-6. 1 family, offering strong performance at a lower price. The AI business’ general-purpose models span four tiers. Products named "Sol" or "Astra" are its high-end offerings and come with price tags to match. "Luna" models are its cheapest offerings. This new model gets the "Terra" treatment the company reserves for mid-range models. "Terra continues to advance the cost-intelligence frontier across our model families, providing a new balance of speed, capability, and cost," OpenAI said . "Its standard API prices are 50 percent lower than those of GPT-5. 6 Terra and GPT-6. 1 Sol, making it practical for developers to automate high-volume work, like reading incoming invoices and entering their details into accounting software." Artificial Analysis, a site that tracks model performance and cost, notes that GPT-6. 1 Terra pushes the cost efficiency frontier. "It is the first Terra-class model since GPT-5. 6, and is more intelligent for less than a third of the cost," the site says. GPT-6 Luna ($0. 10/M input tokens, $0. 50/M output) occupies the lowest tier of OpenAI’s model lineup in terms of cost and capability, followed by GPT-6. 1 Terra ($1/M, $5/M), GPT-6. 1 Sol ($2/M, $10/M), and GPT-6 Astra ($10/M, $50/M). In a comment posted to Hacker News, Ted Sanders, a member of technical staff at OpenAI, framed the differences between the various GPT-6. 1 models thus: "In the case of GPT-6. 1 Terra, I’d say Terra is probably better than Astra and Sol at technical communication, similar on vision and computer use (but much faster!) , and a bit worse on most other things. For API developers, it’s a nice midrange option if you want something cheaper than Sol but a lot smarter than Luna (especially for vision/computer use/communication)."…
