Model differences
Ninja Double Oven DCT401, DCT401CO, DCT451 and Pro models compared
Ninja's Double Oven name covers several two-chamber designs, but DCT401, DCT401CO, DCT451, DCT801BK and DCT871 are not the same menu with a color change. Their probe packages, Dehydrate availability, Proof and Cookies programs, included pans, display layouts and listed body dimensions differ. Choose by the jobs you want to do in one cooking plan, then verify the exact model code and the guide supplied for it.
Read the exact mode map
The earlier DCT401 is a twelve-program, six-plus-six configuration. The upper chamber lists Broil, Toast, Bagel, Bake, Reheat and Keep Warm; the lower chamber lists Whole Roast, Air Roast, Air Fry, Convection Bake, Pizza and Dehydrate. The exact DCT401 box list does not include a Foodi thermometer. Its linked DCT400 Series guide mentions some optional functions for the series, but the DCT401's own panel does not show Cookies or an upper Pizza button. Do not transfer those options to the un-suffixed code.
DCT401Q Cinnamon and Copper are separate exact codes
DCT401QCM Cinnamon and DCT401QCP Copper are not just finish names for the plain DCT401. The exact DCT401QCM and DCT401QCP listings each describe a twelve-function Double Oven with six upper modes (Bake, Broil, Reheat, Keep Warm, Bagel and Toast) and six lower modes (Air Fry, Convection Bake, Pizza, Air Roast, Whole Roast and Dehydrate). Their listed body dimensions and weights match: 18.6 inches long, 16.39 inches wide, 13.26 inches high and 31 pounds. The difference stated for these two seller-listed configurations is finish. The DCT401Q Series guide is its own revision, Mv4, rather than the DCT400 Mv11 guide linked from the plain DCT401 listing.
The Q-series guide describes one top rack position and two in the bottom, requires at least one inch of open airflow space above and on all sides, and says not to use an extension cord. Its twelve-mode family list also warns that Reheat, Keep Warm and Dehydrate are not included on every model. For the exact QCM and QCP listings, those modes are named, but do not assume the generic DCT401Q name or another code has the same panel. Confirm the full suffix on the appliance and use its matching guide. The Q-series manual also says accessories may vary by model; a refurbished bundle listing is not proof of the box contents in another open-box or used unit.
These two Q-series finishes are useful earlier-model references if the dual-zone plan suits you and the exact condition and included parts are verified. They remain distinct from DCT401CO's fourteen-mode menu and DCT451's package with a Foodi Smart Thermometer. If you require a probe, do not count the QCM/QCP listings' compatibility with replacement parts as evidence of an included sensor.
The Costco-listed DCT401CO is a separate fourteen-program reference, not a finish option for plain DCT401. Its exact SharkNinja control-panel render and DCT401CO Series Mv6 guide show seven upper programs (including Cookies) and seven lower ones (including Dehydrate and Proof). The Costco package also lists two cake pans and a roast tray with the sheet pans, two racks and basket. Its guide text contains one top-menu selection line that says Pizza where the exact panel, detailed top-mode section and rack chart say Bake; use the corroborated on-panel layout, and keep that text discrepancy visible. The package does not list a probe. Its current availability is unverified, so it remains an earlier opt-in reference. The guide has not been shown to be the DCT400 manual simply because the code is similar.
The separate earlier DCT451 also lists six top and six bottom programs, including lower Dehydrate, but its package names the wired Foodi Smart Thermometer. Its DCT450 Series Mv5 guide gives probe restrictions by mode and food. That is not a probe upgrade for DCT401 or DCT401CO; the DCT451 has a distinct exact model page and manual.
DCT801BK has its own twelve-mode list, including Max Crisp, and its exact box list does not name a thermometer or Dehydrate. DCT871 has a different twelve-mode list and a Pro Cook probe. The Pro models do not have an inspected full mode-by-zone chart here, so do not infer that the upper/lower assignment in either DCT401 or DCT451 applies. Later suffixes are not enough to establish matching operating instructions.
Probe availability is not unrestricted probe use
DCT401's exact package list does not name a probe, so it cannot meet an included-probe requirement. For DCT451, the DCT450 Series Mv5 guide identifies compatible and incompatible modes: no probe with upper Toast, Bagel, Reheat or Keep Warm, nor lower Dehydrate; frozen proteins and cuts an inch thick or thinner are excluded too. A probe remains useful for guide-listed roast or bake foods, but follow the insertion instructions and verify safe temperatures with an external thermometer.
DCT871's product page lists a Pro Cook thermometer; DCT801BK's does not. Both later pages retain separate mode-by-zone uncertainty because the exact DCT800 guide was not available for inspection. Those gaps should stay visible rather than being filled with DCT401 or DCT451 instructions.
Measure body and operating room separately
The exact DCT401 retailer listing reports 16.39 inches wide, 18.6 deep, 13.26 high and 31 pounds. The DCT400 manufacturer guide itself does not give these exterior dimensions; treat them as listing specifications, not independent measurements. A 12-inch pizza is shown in the DCT401 recipe guide, but that does not establish cavity volume or clearance for every pan handle. The DCT451 listing gives 18.6 L x 16.39 W x 13.26 H and 31.3 pounds; DCT801BK is 18.7 L x 17.2 W x 13.98 H and 25.35 pounds; DCT871 is 21.42 L x 19.76 W x 15.94 H and 36.24 pounds. Keep the published measurement order intact and do not confuse the body with a usable pan area.
The DCT401 and DCT451 manuals require at least one inch above and on every side for airflow, stable countertop placement and no extension cord. Check the exact guide for any newer model instead of carrying clearance figures across a family name. Measure depth, plug access, door movement and a place to set hot racks. A 16.39-inch body does not mean a 16.39-inch counter gap will work.
Which configuration suits which need?
Choose plain DCT401 as an earlier reference if you want separate upper/lower scheduling and Dehydrate but do not require a probe or extra proofing pans. Consider DCT401CO only if the exact Costco bundle's additional top Cookies and lower Proof programs and cake pans suit your cooking; its stock is unverified and its published 18.6-inch depth needs counter space. Consider DCT451 if the earlier status is acceptable and you want both Dehydrate and the included Foodi thermometer, with its manual's restrictions. Consider DCT801BK for a later Pro menu without an included probe, or DCT871 if its Pro Cook probe and larger listed body fit your counter. If you mainly want shared-cavity baking and a thermometer, the single-cavity DT551 is a different arrangement, not a two-zone oven.
Earlier products remain out of the finder unless you choose to include them. If comparing DCT401 listings, check the full code, condition and actual included accessories; no DCT401 suffix is a safe shortcut to another package. See the DCT401 assessment, DCT401CO review, the DCT451 review, the DCT801BK review and the DCT871 review for their individually sourced differences. Neither similar names nor compatible replacement accessories prove that boxes, controls or manuals can be mixed.