GitHub Copilot Fusion claims 40% faster work at up to 77% lower cost

Three announcements from GitHub Universe

In a LinkedIn post, Nadella said Microsoft is "redefining the SDLC for the agentic era", referring to the software development lifecycle. He listed three product updates revealed at GitHub Universe.

• GitHub Copilot Fusion delivers frontier-level quality, 40% faster and at up to 77% lower cost, according to Nadella.
• The unified Copilot harness is now available in Foundry.
• Copilot Projects offers an orchestration loop for building with multiple agents across repositories.

The post does not say what the speed and cost figures are measured against, and it gives no benchmark details. The numbers are Microsoft's own claims.

Agents in Foundry and across repositories

Nadella described Foundry as a managed service for building long-running agents that reason, use tools and get work done. Placing the unified Copilot harness there means the same agent foundation used in Copilot can serve as a base for those agents.

Copilot Projects addresses a different problem: coordinating several agents at once. According to Nadella, it gives developers an orchestration loop so that multiple agents can work across repos. The post does not describe how the agents divide tasks or how conflicts between them are handled.

Nadella also said Microsoft is expanding capacity and strengthening GitHub's architecture. The stated aim is to make what he called the home of agentic development more resilient. No capacity figures or timelines were given.

Reaction and open questions

The post drew more than 350 comments, and many raised practical concerns rather than praising the launch. One commenter asked how Copilot Projects handles two agents changing the same dependency. Another pointed to the security questions that arise when agents can read, modify and execute code across multiple projects.

Others focused on verification and accountability. One argued that as execution becomes more autonomous, validation of agent changes has to keep pace. Another wrote that the pace of shipping will be set by the pace of decisions, which does not scale with compute. A commenter also asked whom the 77% cost reduction benefits, and several linked the announcement to Microsoft's recent workforce decisions. These are the views of individual commenters, not Microsoft statements.

For developers and companies, the announcements point to a workflow where several agents run in parallel across codebases. Whether Fusion's speed and cost claims hold up in practice, and how permissions, conflicts and review are managed, cannot be judged from the post alone. Those details will matter for teams deciding whether to adopt the tools.