Project HydraFusion: multi-model orchestration in GitHub Copilot CLI (/experimental)

GitHub introduces Project HydraFusion and shares benchmark results claiming higher verified task quality and lower estimated cost versus Claude Opus 5 on Terminal-Bench 2.1. The short also points developers to try HydraFusion as a selectable model via the /experimental feature in GitHub Copilot CLI.

Overview

Claimed evaluation results

• +4.9 percentage points higher verified task quality.
• 67% lower estimated cost.
• Results are stated as measured against Claude Opus 5 on Terminal-Bench 2.1 in controlled offline evaluations.

What HydraFusion is

• HydraFusion orchestrates the models and workflow for each coding task.
• It is presented as something you can select like any other model.

How to try it

• Try HydraFusion through /experimental in GitHub Copilot CLI.

Reference

• GitHub blog post: https://github.blog/ai-and-ml/github-copilot/project-hydrafusion-frontier-quality-via-multi-model-orchestration/?utm_source=youtube-launch-video&utm_medium=social&utm_campaign=project-hydrafusion-sep-2026