OpenAI Launches GPT-6.1 Terra, Its Half-Good AI Model at Half the Price

OpenAI released GPT-6.1 Terra on Monday. It is an improved version of the middle model in its lineup. The company says it costs developers 50% less than GPT-5.6 Terra and can handle computer tasks faster and more accurately.

Terra is an everyday model designed for common office tasks, such as reading what is on a screen, clicking through apps, and writing replies. This ability is called computer use. It means the AI can look at your screen, click buttons, and type as a person would. The 50% price cut applies to standard API prices, which are the rates developers pay to connect the model to their own apps.

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“It’s a big improvement over GPT-5.6 Terra, with standard API prices that are 50% lower,” OpenAI said in its announcement. The company also said that “GPT-6.1 Terra is rolling out now and is available to all Plus, Pro, Enterprise, and Edu users in ChatGPT Work and Codex.”

ChatGPT Work is a mode inside ChatGPT that lets an AI agent work across apps, browse websites, and complete tasks for you. Codex is OpenAI's coding tool. Free users can use GPT-5.6 Luna, a less powerful model.

OpenAI tested the model using its own set of prompts designed to trick AI models into making mistakes. At low reasoning effort, a setting that controls how long the model spends thinking, the rate of factual errors fell from 53.6% with GPT-5.6 Terra to 16.7% with GPT-6.1 Terra. At the highest effort setting, the error rate dropped by 18 percentage points, reaching 4.3%.

Terminal-Bench 4.0 tests AI coding agents on tasks performed through a computer's command-line terminal. It measures the percentage of tasks they complete successfully. At the highest effort setting, Terra completed 50.3% of tasks, compared with 21.5% for GPT-5.6 Terra. OpenAI also says Terra completes tasks more than three times faster on average than GPT-6 Astra and GPT-6.1 Sol. These figures all come from OpenAI, and the test of factual errors was conducted internally by the company.

OpenAI first introduced Terra on June 26 as part of the GPT-5.6 family. It was available in a limited preview requested by the Donald Trump administration. On July 9, the company made it available to the public, describing it as a model that could compete with GPT-5.5 while costing about half as much.

In September, OpenAI released GPT-6 Sol and Luna just minutes after Anthropic released Claude Opus 5.5. OpenAI did not release a new Terra model at that time.

For detailed research or difficult coding tasks, OpenAI still recommends GPT-6.1 Sol or GPT-6 Astra.