Microsoft made Copilot Cowork generally available worldwide today, expanding its agentic AI system for Microsoft 365 customers after a three month preview in Frontier.

The company said more than half of the Fortune 500 used Cowork during the preview, along with customers including Accenture, Avanade, Capital Group, Koch, Ooredoo Qatar, and Zurich Insurance.

Cowork is designed to execute complex, long running tasks across tools and business systems rather than only returning drafts or recommendations. 

Microsoft said users have used the product to edit batch job spreadsheets, generate dependency flow charts, compare thousands of files across product versions, and review stalled sales pipelines.

The product runs inside Microsoft 365 and uses Work IQ to ground tasks in company data and workflows. 

Microsoft said Cowork prompts, responses, and generated artifacts are governed by existing Microsoft 365 controls, including audit logs, eDiscovery, Data Security Posture Management, and Communication Compliance policies.

At launch, Copilot Cowork runs on Anthropic models, including Opus 4.8 and Sonnet 4.6. Frontier customers can use GPT 5.5, while Microsoft said its own Cowork 1 model will be released in the coming weeks as a lower cost option for everyday tasks.

The launch also introduces usage based billing through Copilot Credits. Microsoft said Cowork pricing is based on model use, context retrieval, tool calls, and runtime, with PayGo priced at $0.01 per Copilot Credit. Customers can also use spending limits, usage alerts, billing policies, and user level caps to manage costs.

Microsoft said internal testing showed Copilot Cowork was 30% to 40% cheaper on average than Claude Cowork with its Microsoft 365 connector.

The release adds new plugins from partners including Harvey, LSEG, Miro, Moody’s, Morningstar, S&P Global Energy, and monday.com, with Adobe, Atlassian, Box, Canva, CB Insights, Databricks, and others coming soon.