GitHub: Model Selection for Claude and Codex Agents Now Available

On April 14, GitHub announced a new feature that allows developers to select AI models when launching coding agents directly on github.com.

Available Models

Claude agent (Anthropic):

• Claude Sonnet 4.6 and Opus 4.6 (latest)
• Claude Sonnet 4.5 and Opus 4.5

Codex agent (OpenAI):

• GPT-5.2-Codex, GPT-5.3-Codex, and GPT-5.4

Users can select a model when launching each task, similar to how the Copilot cloud agent already works.

Access and Pricing

Access to Claude and Codex agents is included in the existing Copilot subscription — no additional costs. However, for Copilot Business and Enterprise users, an administrator must approve the relevant policies, and the repository owner must enable agents in the settings.

Why This Matters

This is a significant step toward a model-agnostic approach to AI in development tools. Developers are no longer tied to a single model — they can choose the optimal model for each specific task. Complex refactoring can use Opus 4.6, while routine tasks can run on the faster Sonnet 4.6.