Microsoft unleashes Copilot Cowork to run complex workflows end-to-end

Remember when enterprise AI was mostly just a chatbot drafted to polish an email? Microsoft wants to move past that. It just launched Copilot Cowork into general availability worldwide, and it wants an autonomous agent working in the cloud while your laptop is closed.

Cowork is officially the fastest-growing feature in the history of Microsoft’s Frontier program. After three months of preview, more than half of the Fortune 500 is already running it, including heavyweights like Accenture, Zurich Insurance, and Capital Group.

Running on Anthropic in the cloud

Unlike Copilot Chat, Cowork is built for long-running, multi-tool workflows. You give it a high-level job, and it handles the execution end-to-end instead of just throwing back a draft or suggestions.

Under the hood, Microsoft made a fascinating choice: general availability runs on Anthropic’s flagship models, including Opus 4.8 and Sonnet 4.6. Frontier customers can also tap GPT 5.5, while Microsoft plans to roll out its own fine-tuned Cowork 1 model in the coming weeks for lower-cost workloads.

Because tasks run directly in the cloud, files stay off local drives, security policies remain intact, and processes keep running even if you shut down your PC. It also launches with nine live third-party plugins, including Harvey, LSEG, Miro, and Moody’s, with tools from Adobe, Atlassian, and Databricks coming soon.

Microsoft also threw some shade at rival setups. Internal tests show that running Cowork on Opus 4.8 costs 30% to 40% less per prompt on average than pairing Claude Cowork directly with Anthropic’s M365 connector.

Credits, quotas, and double billing

Getting access won't be cheap. Cowork requires an active Microsoft 365 Copilot user subscription, plus usage-based billing denominated in Copilot Credits.

Pay-as-you-go credits cost $0.01 each, alongside volume discount commitments. Every task bills against four variables: the model used, context retrieval, tool calls, and total runtime.

To keep CFOs from panicking over runaway agent tasks, Cowork is disabled by default. Administrators can set strict spending caps and alert thresholds across tenants, groups, or individual seats. Users who participated in the earlier Frontier window get a grace period before billing starts on July 1.

Why it matters

We think Copilot Cowork sets a clear benchmark for what production enterprise agents look like, moving well beyond basic conversational assistants.

For power users and knowledge workers, being able to dump a stalled pipeline or a four-thousand-file comparison on an agent and walk away is a massive unlock. That said, smaller companies probably should not rush in blindly. Paying a baseline per-user license on top of unpredictable consumption credits means costs can escalate quickly if prompts are unmanaged.

From an industry standpoint, Microsoft’s pragmatic adoption of Anthropic models inside its crown jewel productivity suite is a telling signal. Rather than tying its corporate reputation exclusively to OpenAI, Microsoft is letting customer demand dictate model choice in pursuit of better reasoning and lower prompt costs.

Hosting everything securely in the cloud inside existing M365 trust boundaries neatly sidesteps the local machine vulnerabilities that plague rogue agent setups. If Microsoft can prove its upcoming Cowork 1 model lowers the price floor without sacrificing reliability, this agentic architecture will be tough for standalone rivals to beat.