iPhone 18 Pro Max vs iPhone 15 Pro Max
3 generations apart: every figure Apple publishes for both, side by side. 7 headline measures favour the iPhone 18 Pro Max and 2 the iPhone 15 Pro Max, and 12 specifications differ outright. Written for the people who buy phones by the dozen rather than one at a time: what changed, what it changes about a rollout, and what it does not.
Bottom line. iPhone 18 Pro Max suits field and lone-worker teams, executives and client-facing staff, volume fleets and shared devices, international travel and roaming, marketing, site records and content, replacing a second screen on the road. iPhone 15 Pro Max suits one-handed, all-day carry. Apple publishes no benchmark scores for either phone, so nothing here claims one is “faster”.
iPhone 18 Pro Max against iPhone 15 Pro Max: the same Pro Max model, 3 generations apart. The 18 Pro Max runs the A20 Pro, the 15 Pro Max the A17 Pro. Apple publishes 131 specification lines for the two and 65 of them differ. The widest of those gaps are capacity (Up to 2TB against Up to 1TB), longest optical zoom (8× against 5×), peak brightness outdoors (3000 nits against 2000 nits) and front camera (18 MP against 12 MP). The 66 lines where the 18 Pro Max and the 15 Pro Max read identically are on this page as well: a difference only means something next to what did not change.
12 specifications that are not the same
12 differences worth a decision. Apple's full specification for the iPhone 18 Pro Max and the iPhone 15 Pro Max differs on 65 of 131 published lines, and every one of those is in the table at the end; the ones below are the ones that change what the phone does.
What separates the 18 Pro Max from the 15 Pro Max
10 figures Apple publishes for both. 7 favour the 18 Pro Max, 2 the 15 Pro Max and 1 are the same number on both spec sheets. The badge marks the model a figure favours, which is not the same as the better buy — on weight it goes to the 15 Pro Max at 221 g, because there the lower number wins.
18 Pro Max and 15 Pro Max, drawn to the same scale
iPhone 18 Pro Max: 163.4 × 78 × 8.75 mm, 249 g. iPhone 15 Pro Max: 159.9 × 76.7 × 8.25 mm, 221 g. The outlines below are plotted from those millimetres at one scale, so the difference is the real one rather than two press photographs cropped to the same height.
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Usable screen area
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What you are actually handing to staff: 18 Pro Max or 15 Pro Max
Apple's own photography for both models, unedited. iPhone 18 Pro Max: Aluminium unibody, Ceramic Shield 2 front, 3x better scratch resistance. iPhone 15 Pro Max: Titanium frame, Ceramic Shield front. Apple lists a different frame material for each, which the rear shots show more plainly than a spec line does.
iPhone 18 Pro Max
iPhone 15 Pro Max
18 Pro Max or 15 Pro Max — which one, and why
Drawn from the figures above: the 18 Pro Max leads 7 of the 10 headline measures and the 15 Pro Max 2. Apple publishes no benchmark for the A20 Pro or the A17 Pro, so nothing here claims one is faster — only what each is documented to do.
Choose the iPhone 18 Pro Max if…
Widest measured lead: capacity, Up to 2TB against Up to 1TB — 100% more.
- Screen size: 6.9″ against 6.7″.
- Usable screen area: 116.7 cm² against 110.2 cm².
- Video playback: 43 hrs against 29 hrs.
- Capacity: Up to 2TB against Up to 1TB.
- Peak brightness outdoors: 3000 nits against 2000 nits.
- Longest optical zoom: 8× against 5×.
Choose the iPhone 15 Pro Max if…
Widest measured lead: weight, 221 g against 249 g — 13% less.
- Weight: 221 g against 249 g.
- Thickness: 8.25 mm against 8.75 mm.
- Fits best for one-handed, all-day carry — weight and thickness for staff who carry a phone in a pocket for ten hours.
Where the 18 Pro Max pulls ahead, and where the 15 Pro Max does
Seven ways a business actually deploys phones, every call made on published figures only: 6 go to the 18 Pro Max, 1 to the 15 Pro Max. Battery (43 against 29 hours), weight (249 against 221 g) and screen area (116.7 against 110.2 cm²) decide most of them.
Battery, zoom and capacity: 18 Pro Max against 15 Pro Max
Video playback 43 against 29 hours, streamed video 38 against 25, optical zoom to 8× against 5×, a capacity ceiling of 2TB against 1TB. Four charts on shared axes, with the A20 Pro and the A17 Pro placed in Apple's own line of chips.
Battery, on Apple’s own tests
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Optical zoom
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Capacity
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Where each chip sits in the line
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What changes for IT between the 18 Pro Max and the 15 Pro Max
For whoever manages them, the iPhone 18 Pro Max and the iPhone 15 Pro Max part company on wireless — and on nothing else in this section. Enrolment, configuration profiles and the MDM you already run behave the same way on both.
SIM and provisioning
Apple publishes the same SIM line for the 18 Pro Max and the 15 Pro Max, so provisioning is the same job on either, and both enrol through Apple Business Manager.
Unlock method
Both the 18 Pro Max and the 15 Pro Max unlock with Face ID, so one MDM passcode policy covers the pair without an exception for either.
Water and dust
The 18 Pro Max and the 15 Pro Max carry the same rating, IP68 to 6 metres. Apple tests it in laboratory conditions and it is not permanent, so on a site fleet it is still not a substitute for a case.
Safety features
Apple lists the same safety features on the 18 Pro Max and the 15 Pro Max, so a lone-worker policy that names satellite SOS does not choose between them.
Wired transfer
Apple lists the same connector for the 18 Pro Max and the 15 Pro Max: USB-C Supports USB 3 (up to 10Gb/s). At 10Gb/s, imaging or backing a device up over a cable is not the bottleneck on either.
Wireless
18 Pro Max: Wi-Fi 7 · Bluetooth 6. 15 Pro Max: Wi-Fi 6E · Bluetooth 5.3. Wi-Fi generation decides how a device behaves on a busy corporate WLAN long before it decides raw speed.
Apple Intelligence
Apple lists Apple Intelligence for both the 18 Pro Max and the 15 Pro Max. The on-device AI features are the thing a data-handling policy has to have an answer for before either is rolled out.
All 131 lines Apple publishes, differences first
All 131 lines Apple publishes for the iPhone 18 Pro Max and the iPhone 15 Pro Max, in Apple's own grouping and wording. 65 of them differ; the default view hides the 66 that do not.
Every line below is Apple’s own wording. Not listed means Apple does not publish that line in the specification for that model — usually because it arrived with a later generation. It is a statement about Apple’s specification, not about what the hardware can do.
Capacity
| iPhone 18 Pro Max | iPhone 15 Pro Max | |
|---|---|---|
| Capacity | Up to 2TB | Up to 1TB |
| Options | 256GB, 512GB, 1TB, 2TB | 256GB, 512GB, 1TB |
Display
| iPhone 18 Pro Max | iPhone 15 Pro Max |
|---|---|
| 6.9-inch (diagonal) all-screen OLED display | 6.7-inch (diagonal) all-screen OLED display |
| 2868x1320-pixel resolution at 460 ppi | 2796x1290-pixel resolution at 460 ppi |
| 3,000 nits peak brightness (outdoor) | 2,000 nits peak brightness (outdoor) |
| 1 nit minimum brightness | Not listed |
Size and weight
| iPhone 18 Pro Max | iPhone 15 Pro Max | |
|---|---|---|
| Height | 163.4 mm (6.43 inches) | 159.9 mm (6.29 inches) |
| Width | 78.0 mm (3.07 inches) | 76.7 mm (3.02 inches) |
| Depth | 8.75 mm (0.34 inches) | 8.25 mm (0.32 inches) |
| Weight | 249 grams (8.78 ounces) | 221 grams (7.81 ounces) |
Chip
| iPhone 18 Pro Max | iPhone 15 Pro Max |
|---|---|
| A20 Pro chip | A17 Pro chip |
| 6-core CPU with 2 super cores and 4 efficiency cores | 6-core CPU with 2 performance and 4 efficiency cores |
| 7-core GPU with Neural Accelerators | 6-core GPU |
| Dual 16-core Neural Engine | 16-core Neural Engine |
Rear cameras
| iPhone 18 Pro Max | iPhone 15 Pro Max |
|---|---|
| 48MP Pro Fusion camera system | Pro camera system |
| 48MP Fusion Main with variable aperture 48MP Fusion Ultra Wide 48MP Fusion Telephoto | 48MP Main 12MP Ultra Wide 12MP Telephoto |
| Second-generation sensor-shift optical image stabilisation (Fusion Main) 3D sensor-shift optical image stabilisation (Fusion Telephoto) | Second-generation sensor-shift optical image stabilisation (Main) |
| 0.5x, 1x, 2x, 4x, 8x optical zoom options 0.5x, 1x, 2x, 4x, 8x optical zoom options | 0.5x, 1x, 2x, 5x optical zoom options 0.5x, 1x, 2x, 5x optical zoom options |
| ƒ/1.48, ƒ/1.8, ƒ/2.8, ƒ/4.0 variable aperture options (Fusion Main) | Not listed |
| Pro controls for lens aperture, shutter speed, white balance and viewing histogram | Not listed |
| Photographic Styles 3 | Photographic Styles |
| Smart focus tracking | Not listed |
| Apple Reference Image (Fusion Main) | Not listed |
Video recording
| iPhone 18 Pro Max | iPhone 15 Pro Max |
|---|---|
| 4K Dolby Vision video recording up to 120 fps (Fusion Main), up to 60 fps (Fusion Ultra Wide, Fusion Telephoto) | 4K Dolby Vision video recording up to 60 fps |
| Cinematic mode for recording videos with shallow depth of field (up to 4K Dolby Vision at 60 fps) | Cinematic mode for recording videos with shallow depth of field (up to 4K Dolby Vision at 30 fps) |
| Cinematic mode effects from video | Not listed |
| Pro controls for lens aperture, shutter speed, white balance and viewing histogram | Not listed |
| Smart focus tracking | Not listed |
| Improved low-light video | Not listed |
| Dual Capture (up to 4K Dolby Vision at 30 fps) | Not listed |
| ProRes video recording up to 4K at 120 fps with external recording | ProRes video recording up to 4K at 60 fps with external recording |
| ProRes RAW | Not listed |
| Apple Log 2 video recording | Apple Log video recording |
| Genlock support | Not listed |
| Slo-mo video support for 1080p up to 240 fps and 4K Dolby Vision up to 120 fps (Fusion Main) | Slo-mo video support up to 1080p at 240 fps |
| Time-lapse video recording with stabilisation up to 4K Dolby Vision | Not listed |
| QuickTake video (up to 4K at 60 fps in Dolby Vision HDR) | QuickTake video |
| Second-generation sensor-shift optical image stabilisation (Fusion Main) 3D sensor-shift optical image stabilisation (Fusion Telephoto) | Second-generation sensor-shift optical image stabilisation (Main) |
| Spatial Audio and stereo recording | Stereo recording |
| Studio-quality four-mic array | Not listed |
| Wind noise reduction | Not listed |
| Audio Mix | Not listed |
Front camera
| iPhone 18 Pro Max | iPhone 15 Pro Max |
|---|---|
| 18MP Center Stage front camera | TrueDepth front camera |
| 18MP photos | 12MP photos |
| Centre Stage for photos | Not listed |
| Dual Capture | Not listed |
| Centre Stage for video calls | Not listed |
| Tap to zoom and rotate | Not listed |
| Ultra-stabilised video | Not listed |
| Photographic Styles 3 | Photographic Styles |
| Smart focus tracking | Not listed |
| Improved low-light video | Not listed |
| Cinematic mode effects from video | Not listed |
| Time-lapse video recording with stabilisation up to 4K Dolby Vision | Not listed |
| QuickTake video (up to 4K at 60 fps in Dolby Vision HDR) | QuickTake video |
Power and battery
| iPhone 18 Pro Max | iPhone 15 Pro Max |
|---|---|
| Up to 43 hours | Up to 29 hours |
| Up to 38 hours | Up to 25 hours |
| Up to 50% charge in around 15 minutes when using 60W-capable adapter or higher with Adjustable Voltage Supply (available separately) paired with USB-C charging cable | Up to 50% charge in 35 minutes with or higher (available separately) paired with USB-C charging cable 20W adapter |
| Up to 50% charge in 30 minutes with 35W adapter or higher paired with MagSafe Charger (both available separately) | Not listed |
Mobile and wireless
| iPhone 18 Pro Max | iPhone 15 Pro Max |
|---|---|
| Wi-Fi 7 | Not listed |
| Bluetooth 6 | Bluetooth 5.3 |
| Express Cards with power reserve | Express Cards with Power Reserve |
| Not listed | Wi-Fi 6E |
Secure authentication
| iPhone 18 Pro Max | iPhone 15 Pro Max |
|---|---|
| Enabled by TrueDepth technology in the Center Stage front camera | Enabled by TrueDepth front camera for facial recognition |
SIM
| iPhone 18 Pro Max | iPhone 15 Pro Max |
|---|---|
| Dual SIM (two active eSIMs, or nano-SIM and eSIM) Dual eSIM support Supports advanced eSIM technology for more convenience and security. | Dual SIM (two active eSIMs, or nano-SIM and eSIM) Dual eSIM support Supports advanced eSIM technology for more convenience and security |
iPhone 18 Pro Max vs iPhone 15 Pro Max, answered
What is the real difference between the iPhone 18 Pro Max and the iPhone 15 Pro Max?
A20 Pro replaces A17 Pro — the graphics go from “6-core GPU” to “7-core GPU with Neural Accelerators”, and the Neural Engine from “16-core Neural Engine” to “Dual 16-core Neural Engine”. Apple publishes no benchmark for either, so how much of that reaches a user depends entirely on the apps. Video playback goes from 29 hours to 43 — up 14 hours (48%) on Apple’s own measure. The display moves from 6.7″ to 6.9″, which is 6% more usable area.
Is the iPhone 18 Pro Max worth upgrading to from the iPhone 15 Pro Max for business use?
That depends on what the phones are used for. The iPhone 18 Pro Max leads on field and lone-worker teams, executives and client-facing staff, volume fleets and shared devices, international travel and roaming, marketing, site records and content and replacing a second screen on the road. The iPhone 15 Pro Max still leads on one-handed, all-day carry. Battery is the figure most fleets feel: 43 hours against 29 on Apple's own video-playback test.
Which has better battery life, the iPhone 18 Pro Max or the iPhone 15 Pro Max?
Apple quotes up to 43 hours of video playback for the iPhone 18 Pro Max and up to 29 hours for the iPhone 15 Pro Max — a 48% difference on the same test. Streamed video, which is closer to real use, is 38 hours against 25.
Can both be managed and enrolled the same way?
Yes. The iPhone 18 Pro Max and the iPhone 15 Pro Max both enrol through Apple Business Manager with automated device enrolment, take the same configuration profiles and are managed by whichever MDM you already run. What does differ for IT is wireless, plus how long each keeps receiving iOS feature updates.
How long will each one keep getting iOS updates?
Apple does not publish a support end date for any iPhone. What history shows is roughly five to seven years of iOS releases from launch, which puts the iPhone 15 Pro Max 3 generations further through that window than the iPhone 18 Pro Max. Plan a fleet on the older model's clock, not the newer one's.
Where these figures come from. Every specification on this page is taken from Apple’s own published material — iPhone 18 Pro Max specifications and iPhone 15 Pro Max specifications, cross-checked against Apple’s compare tool, captured 12 September 2026. Screen areas and percentage differences are calculated from those figures. This is a specification comparison only: nothing here is a benchmark, a price or a statement about stock.
Other iPhone comparisons
Buying for a team rather than a person? The same approach applies to laptops — see the business laptop finder, the hardware refresh planner for what a phone and laptop cycle costs together, and every other comparison we publish.
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