Giant Insect
You summon a giant centipede, spider, or wasp (chosen when you cast the spell). It manifests in an unoccupied space you can see within range and uses the Giant Insect stat block. The form you choose determines certain details in its stat block. The creature disappears when it drops to 0 Hit Points or when the spell ends. The creature is an ally to you and your allies. In combat, the creature shares your Initiative count, but it takes its turn immediately after yours. It obeys your verbal commands (no action required by you). If you don't issue any, it takes the Dodge action and uses its movement to avoid danger.
Using a Higher-Level Spell Slot. Use the spell slot's level for the spell's level in the stat block.
Giant Insect 5e 2024 vs. 2014 edition differences
The 2024 version summons a single giant insect with a specific stat block, chosen at cast, and it acts immediately after the caster, obeying verbal commands without action. The 2014 version transforms multiple creatures into giant forms, which obey commands, act on the caster's turn, and have GM-determined stats. Duration is similar; the 2024 version explicitly states the creature disappears at 0 HP or when the spell ends.