According to reports from October 2026, OpenAI introduced GPT-6.1 Terra as a successor/variant tailored specifically for agent work, adjusting the economic model relative to GPT-6.1 Sol.
Reported facts indicate that GPT-6.1 Terra reduces the API price for agent work by half compared to GPT-6.1 Sol. Analysis of this pricing shift suggests that OpenAI is addressing cost barriers inherent in multi-step agentic workflows, where repeated tool calls and inference cycles drive up operational expenses.
This comparison is strictly based on manufacturer announcements and reported documentation; no independent, hands-on performance or latency testing was conducted.