| Feature | OPEC | OPEC+ |
| Membership | A formal, intergovernmental organization of 12 member countries. | Includes the 12 OPEC members plus 10 non-OPEC oil exporters. |
| Founding | Founded in Baghdad, Iraq, in 1960 by Iran, Iraq, Kuwait, Saudi Arabia, and Venezuela. | Formed in late 2016 as an alliance between OPEC and other oil-producing nations. |
| Purpose | To coordinate and unify the petroleum policies of its member countries and stabilize oil markets. | To manage the global oil market more effectively by incorporating major non-OPEC producers. |
| Key non-OPEC members | Not applicable | Russia, Mexico, Kazakhstan, Azerbaijan, Bahrain, Brunei, Malaysia, Oman, South Sudan, and Sudan. |
| Market share | Controls a significant share of global oil reserves, but OPEC+ has a larger influence over global production levels. | Controls a larger percentage of global oil production, giving it more influence over international oil prices. |
| Influence | While influential, its power can be challenged by market developments like the rise of non-OPEC producers. | Has a stronger and broader market influence due to its larger share of global oil supply. |