OpenAI launches GPT-6.1 Terra with 50% lower API prices and improved reasoning performance

OpenAI has released GPT-6.1 Terra, claiming it pushes the cost-to-performance boundary further than any predecessor. API prices are half those of GPT-5.6 Terra, with input tokens at $1 per million and output tokens at $5. Cached inputs drop to $0.05 per million. On the Intelligence Index, Terra scores 48, a 6-point gain over GPT-5.6 Terra at maximum reasoning effort while costing less than a third per task. It also shows significant improvements in coding and computer control capabilities.