OpenAI Launches GPT-6.1 Terra, Halving GPT-6.1 Sol’s API Price for Agent Work

OpenAI released GPT-6.1 Terra, a closed-weights model for visual reasoning, computer use and writing with a 1.05M-token context window and 128K max output, priced at $1 per million input tokens and $5 per million output tokens—half of GPT-6.1 Sol. OpenAI reports 85.5% on MMMU-Pro (Vision) at max effort, 60.0% on Agents' Last Exam v1 at $1.01 per task, and 50.3% on Terminal-Bench 4.0, trailing GPT-6.1 Sol (55.9%) and Claude Sonnet 5.5 (70.6%). It is available in the API as gpt-6.1-terra and in ChatGPT Work and Codex for Plus, Pro, Enterprise and Edu users.