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Project Mariner runs ten tasks at once on cloud VMs. Fan out your own agents with LangChain

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What Project Mariner does Project Mariner is Google's agent that browses and acts on websites for people. At I/O in May 2025, Google said the new version runs on virtual machines in the cloud. That lets it handle up to 10 tasks at once while people get on with other work. It launched first for U.S. subscribers to the $249.99-a-month AI Ultra plan.

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