Update 1.6.9, you may need to clear cache for updated files.
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 Ghast NBT Data Tags
Using the summon command to spawn in a minecraft ghast is simple, take the command and enter into chat and presto you have a ghast. Ghasts have regular hostile mob tags in addition to their explosion power.
Ghasts explosion power
The ExplosionPower sets the radius of the explosion created by the fireballs this ghast fires. The default is 1.
/summon minecraft:ghast ~ ~ ~ {ExplosionPower:4}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.