# Configure weighted traffic splits for Vercel Flags from the Vercel CLI

By Steven Van · 2026-05-21

Vercel's CLI gets a \`flags split\` command to send a set percentage of traffic to one flag variant and the rest to another.

The [Vercel](<https://creatorstoolbox.com/tools/vercel>) CLI now supports weighted traffic splits for Vercel Flags with a new vercel flags split command. It sends a set percentage of traffic to one variant and the rest to another, so a flag can be gradually exposed to only part of an audience rather than switched on or off for everyone.

The command can be run interactively, or non-interactively by passing the environment, a bucketing attribute, and the variant weights as flags, for example splitting traffic 95/5 between the "off" and "on" variants of a flag for production users bucketed by user.id. It requires an [updated version](<https://vercel.com/changelog/configure-weighted-traffic-splits-for-vercel-flags-from-the-vercel-cli>) of the Vercel CLI.

[![](<https://vercel.com/api/docs-og?title=vercel%20flags&format=docs&sig=86b56d5d3ebc65f88275fa343bbd724780a724adf9c9c5df52b505e6015cf24b&category=Ship%20and%20scale&subcategory=CLI>)](<https://vercel.com/docs/cli/flags#configuring-a-weighted-split>)

![Vercel](<https://www.google.com/s2/favicons?domain=vercel.com&sz=128>)

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Sources

[Original source](<https://vercel.com/docs/cli/flags#configuring-a-weighted-split>)

[Read Configure weighted traffic splits for Vercel Flags from the Vercel CLI on Creators Toolbox](<https://creatorstoolbox.com/blog/vercel-configure-weighted-traffic-splits-for-vercel-flags-from-the-vercel-cli>)

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Canonical source: https://creatorstoolbox.com/blog/vercel-configure-weighted-traffic-splits-for-vercel-flags-from-the-vercel-cli