You can now configure weighted traffic splits for Vercel Flags with the new vercel flags split command in the Vercel CLI. This allows you to send a percentage of traffic to one variant and the rest to another.

Run the command interactively, or pass the environment, bucketing attribute, and variant weights as flags:

vercel flags split redesigned-checkout \
  --environment production \
  --by user.id \
  --weight off=95 \
  --weight on=5

Update to the latest version of the Vercel CLI and read the documentation to get started.