Official anchors (verify): Plus ≈ $20/mo; Team ≈ $25–30/seat/mo with minimum seats (2+), annual billing cheaper; adds workspace admin, shared GPTs, no-training default.
Team billed annually lands at the ~$25 tier — if you'll keep seats 12 months anyway, Team-annual can beat Plus monthly and you get admin controls.
Official: openai.com/chatgpt/pricing