The iPhone 18 Pro carries two separate pieces of AI hardware inside the A20 Pro, and only one of them has a number attached. Apple quotes the dual 16-core Neural Engine at double the AI processing power of A19 Pro, and publishes no figure of any kind for the Neural Accelerators it names alongside it.
That matters because the two are routinely treated as the same thing. Apple describes the Neural Engine as a dedicated 32-core block, while Neural Accelerators are hardware built into another part of the chip, and Apple’s own pages do not agree on which part.
Key facts on the A20 Pro AI hardware
| Item | What Apple publishes |
|---|---|
| Neural Engine | Dual 16-core, 32 cores in total |
| Neural Engine claim | Double the AI processing power of A19 Pro |
| Neural Accelerators | Named on the A20 Pro, with no performance figure |
| Where the accelerators sit | Press release says the six-core CPU, the tech specs list them with the seven-core GPU |
| GPU claim | Seven cores, up to 40 percent faster than A19 Pro |
| Memory bandwidth | 50 percent more than A19 Pro |
| Ray tracing | Hardware-accelerated, listed on the tech specs page |
| Test conditions | Not published for any of these claims |
What Apple says a Neural Accelerator is
Apple’s language is short. The A20 Pro has Neural Accelerators, they are integrated rather than a separate block, and they are listed as a feature of the chip in the same sentence as core counts.
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Apple has published no throughput figure for them, no count, and no worked example of a task that uses the accelerators rather than the Neural Engine. The term is not new either. Apple’s comparison page already lists Neural Accelerators on the A19 in the iPhone 17, so this is a second-generation description rather than a first appearance.
Where Apple’s own pages place them
Apple’s September 9 press release describes a six-core CPU with integrated Neural Accelerators. Apple’s iPhone 18 Pro tech specs and its iPhone comparison page instead list the seven-core GPU with Neural Accelerators.
Apple has not published a block diagram, and it has not issued a statement reconciling the two descriptions, so both are quoted here exactly as Apple wrote them. Anyone trying to work out what the accelerators speed up is reading two different sentences from the same company.
The Neural Engine is the block with the number
The figure Apple does publish belongs to the Neural Engine, and it names its target. A20 Pro has a dual 16-core Neural Engine, 32 cores in total, which Apple describes as double the AI processing power of the A19 Pro in last year’s iPhone 17 Pro.
| Apple’s claim | Comparison target Apple named | What Apple leaves out |
|---|---|---|
| Dual 16-core Neural Engine, double the AI processing power | A19 Pro | Units, model, workload, duration |
| Seven-core GPU up to 40 percent faster | A19 Pro | Game or task, settings, ambient temperature |
| 50 percent more memory bandwidth | A19 Pro | The bandwidth figure itself, in either generation |
| Neural Accelerators | None named | Any performance figure at all |
These are internal generation-over-generation comparisons. Apple publishes no test conditions with them, which is why none of them is a benchmark and none can be set against a score from a testing app.
What it changes in iOS 27
Apple Intelligence runs on device and in Private Cloud Compute, and iOS 27 arrives on Monday September 14 as a free update. Apple’s own device list shows how little the newest silicon is fenced off: full Apple Intelligence covers iPhone 15 Pro and later, and the higher tier Apple describes as an advanced on-device model includes the A19 Pro phones as well as the A20 Pro ones.
So the AI hardware in the A20 Pro is not a gate on features today. The iPhone Duo carries the same chip and the same described accelerators, and Apple has not published a feature that requires either.
What Apple has not said
Apple has not published a count of Neural Accelerators, a throughput figure, an operations-per-second rating for the Neural Engine, or which of the two blocks handles a given Apple Intelligence request. It has not reconciled the CPU and GPU descriptions, and it has published no test conditions for any A20 Pro claim. Our A20 Pro explainer collects what is on the record.
Pre-orders for iPhone 18 Pro and iPhone 18 Pro Max open today, Saturday September 12, at 5 a.m. PT, which is 12:00 UTC, and the phones reach stores on Friday September 18, two days after Apple Intelligence ships in iOS 27 on Monday September 14.
