We're introducing GPT-6.1 Terra, a fast, efficient model combining detailed visual reasoning and precise computer use with clearer, more natural writing. A significant step up from GPT-5.6 Terra, it excels at communication and computer-based tasks like drafting proposals, interpreting technical drawings, filling out forms, and editing videos.
Terra advances the cost-intelligence frontier, offering standard API prices 50% lower than GPT-5.6 Terra and GPT-6.1 Sol. In Chat GPT Work and Codex, the same usage allowance covers more tasks than with GPT-5.6 Terra and substantially more than with GPT-6.1 Sol or GPT-6 Astra.
On Agents' Last Exam, GPT-6.1 Terra scores 15 percentage points higher than GPT-5.6 Terra at about one-third the cost, performing on par with GPT-6 Astra at only one-tenth its price per token. At max effort, Terra is over three times as token efficient as Claude Opus 5.5, completing tasks over three times faster than both GPT-6 Astra and GPT-6.1 Sol.
On factuality, the error rate at low reasoning effort fell from 53.6% with GPT-5.6 Terra to 16.7% with GPT-6.1 Terra. At maximum effort, GPT-6.1 Terra solves 50.3% of Terminal-Bench 4.0 tasks, more than double GPT-5.6 Terra's published score of 21.5%.
Source: Hacker News · Summarized by HeadlinesBriefing