On 26 October 2026 GitHub announced GPT-6.1 Terra in GitHub Copilot, generally available and rolling out gradually. It is offered on Copilot Pro, Pro+, Max, Business and Enterprise, and appears in the model picker across VS Code, Visual Studio, JetBrains, Xcode, Eclipse, the Copilot CLI, the cloud agent, the Copilot app, github.com and GitHub Mobile.
What GitHub says it is for
Terra is positioned for everyday agentic coding and terminal work, at a lower cost than GPT-6.1 Sol. It is billed at the model provider’s list price under Copilot’s usage-based billing.
Two details that matter to buyers
First, the tier split. AI vendors are now selling a premium model for hard problems and a cheaper one for routine work, and tools let developers pick per task. The price of AI-assisted delivery is increasingly about which model is used for which job, not about the tool.
Second, default enablement. For Business and Enterprise, new models switch on automatically unless an administrator has turned off the global default or disabled that model. We covered that policy change earlier this week; this release is the first time it will visibly bring a new model into a team’s tooling without anyone asking.
So what
If a supplier quotes you for AI-assisted work, ask which models they allow, who approves new ones, and how model cost is handled in the price. Faster and cheaper models should shorten delivery; they should not change who is accountable for the result. Our approach to AI-assisted development keeps a named person reviewing every change. To talk through a build, start a project.