Instant Pot Duo Plus 8L vs Ninja OL650

The decision

Choose the Instant Pot Duo Plus 8L when large-batch pressure cooking, an 8L stainless-steel inner pot and a focused non-air-fry workflow are the priority.

Choose the Ninja Foodi SmartLid OL650 when built-in crisping is recurring and you want pressure, Air Fry and SteamCrisp under one lid.

The nominal base-pot difference is only 0.5L. The real choice is focused pressure cooking versus integrated pressure + crisp.

What changes the choice

Integrated crisping matters more than the half-litre gap

Instant Pot uses an 8L 304-grade stainless-steel inner pot and has no built-in air frying. OL650 uses a 7.5L ceramic-coated pot, a 4.7L Cook & Crisp basket and one SmartLid for pressure, Air Fry and SteamCrisp.

If 7.5L already covers your meals, the half-litre should not outweigh a SmartLid workflow you will use every week. If maximum pot headroom is a recurring need and crisping belongs elsewhere, the Instant Pot remains the cleaner fit.

Existing appliances change the value of OL650

OL650 earns its complexity when pressure-cook-then-crisp is a real routine and its integrated Air Fry replaces a separate step or appliance. If you already own an air fryer you intend to keep, the consolidation benefit can shrink sharply.

Stainless steel can be a hard rule

Instant Pot's inner pot is 304-grade (18/8) stainless steel; OL650's cooking vessels are ceramic coated. If stainless steel is non-negotiable, Instant Pot wins that requirement. The Instant Pot pot is also governed as not stovetop-safe.

Material preference is not used to imply better cooking, durability or safety.

Size and power do not create a performance winner

OL650 is approximately 39cm W × 36cm D × 36cm H. Instant Pot dimensions are unresolved in the current canonical record, and OL650 weight is also unresolved, so no overall size or weight winner is published.

Instant Pot is 1200W and OL650 1760W. That difference does not establish comparative cooking speed across different modes and architectures.

When Instant Pot Duo Plus 8L is the better fit

Choose it when recurring pressure-cooking batches benefit from 8L, stainless steel matters, built-in air frying is unnecessary or duplicated, and you prefer a focused pressure-multicooker architecture.

When Ninja Foodi SmartLid OL650 is the better fit

Choose it when integrated pressure + crisp is used regularly, one-lid switching matters, 7.5L is sufficient and ceramic-coated vessels are acceptable.

When neither is the obvious fit

If you want pressure + crisp but do not need the OL650's single-lid system, the OP350 offers a smaller two-lid Foodi architecture. If 6L pressure cooking and stainless steel are enough, Breville Fast Slow GO is the more focused alternative.

PIQSY conclusion

Instant Pot is the stronger pressure-first tool; OL650 is the stronger one-appliance pressure-and-crisp system. Choose the architecture that removes a recurring constraint rather than the model with the larger number or longer mode list.