GitHub Copilot: GPT-5.6 Sol, Terra, and Luna Models
GitHub CopilotGitHub added OpenAI's new GPT-5.6 model family to GitHub Copilot on the same day it reached general availability. The three tiers are Sol for high-reasoning coding work, Terra as a balanced everyday option, and Luna as a lightweight, low-cost model. The models are available across most Copilot surfaces, while Business and Enterprise organizations need an admin to opt in via policy before developers can select them.
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GPT-5.6 Comes to GitHub Copilot
On July 9, 2026, GitHub added OpenAI's GPT-5.6 model family to GitHub Copilot, shipping support the same day the models reached general availability. Developers can now pick from three tiers depending on the task at hand.
The Three Tiers
- Sol targets the heaviest reasoning and coding tasks, positioned as the strongest option for complex, multi-step work.
- Terra is the balanced mid-tier model, a sensible default for everyday coding and chat.
- Luna is the lightweight, fastest, and cheapest tier for quick or high-volume requests.
Availability and Admin Controls
The new models are selectable across most Copilot surfaces, including chat and the agentic experiences. For Business and Enterprise customers, access is gated behind an organization policy: an admin has to enable the GPT-5.6 models before individual developers can choose them. Individual and Pro users get access without that extra step.
The addition gives Copilot users a second path to GPT-5.6 alongside OpenAI's own Codex, letting teams evaluate the new family directly inside their existing editor workflows.