GitHub Copilot Fusion

Overview

Copilot Fusion became generally available on October 28, 2026 at GitHub Universe, productizing the multi-model orchestration of Project HydraFusion (announced September 4, 2026) with Copilot's auto model selection. It offers Standard, High and Max effort levels and three execution patterns -- Single, Cascade and Critique -- and is available on all Copilot plans in VS Code, the Copilot app, Copilot CLI and JetBrains IDEs. GitHub reports Fusion Max scored 60 on the Artificial Analysis Coding Agent Index, within two points of Claude Code with Opus 5.5 Max at about half the average API cost per task. Administrators can limit Fusion's models through model policies and set a default effort level. Users pay each model's standard rate, with a limited-time 30% discount on model costs for paid plans. Earlier preview details: HydraFusion builds a runtime execution plan per task in Copilot CLI, choosing among three workflow patterns -- Single, Cascade with a quality gate, and Critique with a cross-family reviewer -- across models from multiple providers. In GitHub's offline evaluations across three agentic coding benchmarks it improved verified task quality by 4.9 percentage points at an estimated 67% lower cost than Claude Opus 5 on TerminalBench 2.1. It is selectable via /experimental in Copilot CLI on all plans, billed at each underlying model's standard rate.

This is a sourced directory entry. Features and capabilities are reported in the linked sources; this entry does not document independent Aymorphic testing.

Key features

• Three workflow patterns: Single, Cascade with a quality gate, Critique with a cross-family reviewer
• Runtime-built execution plan per task rather than a fixed router
• +4.9 percentage points verified quality, ~67% lower cost vs Claude Opus 5 on TerminalBench 2.1 (GitHub's own evals)
• Selectable via /experimental in Copilot CLI (preview); now a GA model option in VS Code, Copilot app, CLI and JetBrains
• Standard, High and Max effort levels; admin model policies and default effort
• Local model selection supported (changelog, Oct 28)

Use cases

• Agentic coding needing frontier quality at controlled cost
• Teams wanting automatic per-task model selection

Pricing

No separate fee; billed at each model's standard rate on all Copilot plans, with a limited-time 30% model-cost discount for paid plans.

Pricing reflects the source record and may change. Confirm current terms with the provider.

Dates and sources

Released

4 Sept 2026

Record updated

29 Oct 2026

Record last checked

29 Oct 2026

• github.blog/changelog/2026-10-28-route-and-orchestrate-models-with-github-copilot-fusion/
• github.blog/ai-and-ml/github-copilot/project-hydrafusion-frontier-quality-via-multi-model-orchestration/
• github.com/orgs/community/discussions/206492