GitHub brings Gemini 4 Argon to Copilot, with gradual access across four plans

Google’s Gemini 4 Argon is becoming a coding option inside GitHub Copilot, rather than requiring developers to switch tools to select it. GitHub announced general availability on October 13, 2026, for Pro+, Max, Business and Enterprise subscribers. Access is rolling out gradually, and organizations retain control over whether their teams can use it.

An option across editors and agents

Eligible users can choose Argon through Copilot’s model picker. The supported environments cover both editor-based work and Copilot tools that handle coding assignments. GitHub lists eight places to select the model:

• Editors and development environments: Visual Studio Code, Visual Studio, JetBrains IDEs, Xcode and Eclipse.
• Copilot tools: Copilot CLI, the command-line interface; GitHub Copilot coding agent; and the GitHub Copilot app.

General availability does not mean the option will appear for every eligible account immediately. GitHub says users who cannot yet see Argon should check again as the rollout progresses. The eligible-plan list names Pro+, Max, Business and Enterprise—not the lower-tier Copilot Pro plan.

The strongest reported gains are in the terminal

GitHub describes Argon as designed for complex coding, reasoning and agentic tasks—work in which an AI takes steps toward completing an assignment. Its early testing found that Argon solved more tasks than previous Gemini models on every coding benchmark it tested, with the largest gains in Copilot CLI.

GitHub also says Argon checks its work thoroughly and tests edge cases before finishing. That describes how the model approaches an assignment, alongside the claim about task completion. The announcement supplies no benchmark names or numerical scores, so the comparison remains a company-reported result rather than a quantified performance improvement readers can inspect.

Billing and access are separate decisions

Argon is billed at provider list pricing under usage-based billing. That is the charging rule GitHub gives for this model; the announcement does not quote a numerical rate. It directs users to Copilot’s Models and pricing documentation for billing details.

For Business and Enterprise customers, administrators manage Argon access through the model policy in Copilot settings. The announcement therefore separates plan eligibility from organizational permission: a supported subscription puts a team within the rollout, while its model settings determine whether members are allowed to select Argon.