Minecraft 1.20.5 has changed syntax on many commands, so most commands will no longer work without an update.
An update is in progress, you can check compatibility progress here.
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Try the Commands Troubleshooting and Help page if you get stuff with server errors.
Minecraft Phantom NBT Data Tags
Using the summon command to spawn in a minecraft phantom is simple, take the command and enter into chat and presto you have an phantom.
How summon different sized Phantoms
Phantoms can be summoned at a range of sizes by setting the Size:1 tag.
Naturally spawned phantoms are always size 0. This example summons a larger phantom.
/summon minecraft:phantom ~ ~ ~ {Size:3}How summon a super giant sized Phantom
Phantoms can be summoned by setting the by setting the Size tag larger than the regular 3. A phantom the size of 20 is a giant to see. The limit appears to be Size:64
/summon minecraft:phantom ~ ~ ~ {Size:20}Suggestions or found a bug
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If you're looking for a particular summon mob generator you can link to these specific versions of the command generator.