OpenAI launches GPT-6.1 Terra, a cheaper AI model with improved reasoning and computer use

OpenAI released GPT-6.1 Terra on October 26, a mid-tier model priced at 50% less than GPT-5.6 Terra. In internal testing, the model reduced its factual error rate from 53.6% to 16.7% at low reasoning effort, and at maximum effort it solved 50.3% of Terminal-Bench 4.0 coding tasks, up from 21.5% for the previous version. OpenAI also claims Terra completes tasks over three times faster than GPT-6 Astra and GPT-6.1 Sol.