What an in-house application processor is — why Xiaomi dropped Qualcomm
An in-house application processor is a smartphone's main chip designed by the handset maker rather than purchased from Qualcomm or MediaTek. AP stands for application processor, a single package holding the CPU, GPU, AI engine and the connections to memory and modem. The term is back in the news because Xiaomi launched the 18 Fold in China on September 7, 2026 — the first commercial phone running the company's own Xring O3 — and showed the device at IFA in Berlin the same week. The Xring O3 is built on a 3-nanometre process with ten CPU cores running up to 4.35 GHz and a sixteen-core G2-Ultra NX graphics unit that Xiaomi says is 85 percent faster while using 64 percent less power. It posted 5,228,014 on AnTuTu V11, the first smartphone chip past five million points. The 18 Fold pairs it with next-generation LPDDR6 memory from Chinese maker CXMT running up to 12,800 Mbps, a 7.58-inch inner and 5.38-inch outer display, and a 200-megapixel main camera, starting around 10,999 yuan. Designing your own chip buys timing, differentiation and long-run cost — paid for with fixed engineering spend that only volume recovers
The three lines
- Definition — the phone's main chip designed by the handset maker; CPU, GPU and AI engine in one package
- Case — Xiaomi's Xring O3: 3nm, ten CPU cores at 4.35GHz, 5,228,014 on AnTuTu V11, the first past five million
- Trade — control of timing, differentiation and long-run cost, against fixed engineering spend only volume recovers
Key questions
- How much of the chip does 'in-house' actually cover
- **Design has layers, and 'in-house' usually means the middle one.** | Layer | What it is | Who does it | |---|---|---| | Instruction set (ISA) | the language the chip speaks | **Arm** (licensed) | | CPU core design | the internals of a single core | Arm's stock cores or **custom** | | **SoC integration** | **arranging cores, GPU, AI engine and memory controllers on one die** | **the handset maker** | | Manufacturing | actually printing it | **TSMC or Samsung Foundry** | **Xiaomi's work is the third layer.** The instruction set belongs to Arm and a foundry does the printing. **It still matters, because that layer decides what the product is** — how large the AI engine gets, how camera processing is wired in, where the power budget goes. Apple walked this road first, with the A series in iPhones and the M series in Macs. Google has Tensor, Samsung has Exynos. **Xiaomi has joined that short list late, and arrived with a top-tier score.**
- How fast is the Xring O3
- **On published figures it is the highest-scoring smartphone chip available.** | Item | Value | |---|---| | Process | **3 nm** | | CPU | **10 cores**, up to **4.35 GHz** | | GPU | **16-core G2-Ultra NX** | | GPU claim (Xiaomi) | **85% faster, 64% less power** | | AnTuTu V11 | **5,228,014** — the first phone chip past five million | **Benchmark scores need careful handling.** AnTuTu aggregates CPU, GPU, memory and UX subtests, so the number **reflects the whole device configuration.** The 18 Fold carries next-generation **LPDDR6** memory from China's CXMT at up to **12,800 Mbps**. **So 5,228,014 is not 'the chip's score' — it is the score of this chip plus this memory plus this cooling design.** And **the 85 percent and 64 percent figures are Xiaomi's own, with no stated comparison point.** Whether the baseline is the previous in-house part or a competitor's chip changes the meaning entirely. The difficulty of judging capability from a single benchmark shows up in AI models in exactly the same shape (「What a coding benchmark is」).
- What do you gain and lose by making your own
- **Three gains and one loss.** | Side | Detail | |---|---| | **Gain ① Timing** | no need to align launches with Qualcomm's roadmap | | **Gain ② Differentiation** | circuitry shaped to your own camera pipeline and on-device AI (「What on-device AI is」) | | **Gain ③ Long-run cost** | the per-unit margin paid to a chip vendor disappears; better the higher the volume | | **Loss · Fixed cost** | a leading-edge SoC runs into the hundreds of millions of dollars. **No volume, no recovery** | **That last line is the whole decision.** Design cost is spent before a single unit sells. Only companies shipping tens of millions of handsets a year can carry it, which is why the list runs Apple, Samsung, Google, Huawei, Xiaomi and stops. **Chinese manufacturers have one more reason — supply security.** The 18 Fold follows an in-house chip with **Chinese CXMT memory** — design and memory both sourced domestically. With semiconductor export controls in force (「What AI chip export controls are」), that is a performance play and a shortening of the supply chain at once. **For Korean memory makers, that half of the story matters more than the benchmark.**
The list of companies that design their own phone chips is short because of volume, not because of engineering. Xiaomi has now joined it.
1. One-sentence definition
An in-house application processor is a phone's main chip designed by the handset maker rather than bought from Qualcomm or MediaTek. An AP holds the CPU, GPU, AI engine and memory controllers in one package.
"Designing it yourself" has layers.
| Layer | What it is | Who |
|---|---|---|
| Instruction set (ISA) | the chip's language | Arm (licensed) |
| CPU core design | core internals | Arm stock or custom |
| SoC integration | what goes on the die, and how much | the maker ← here |
| Manufacturing | printing it | TSMC / Samsung Foundry |
The third layer decides what the product is — the size of the AI engine, how camera processing attaches, where the power budget goes.
2. The case — Xiaomi's Xring O3
Xiaomi launched the 18 Fold in China on September 7, 2026, the first commercial phone running its own Xring O3, and showed it at IFA in Berlin the same week.
| Item | Value |
|---|---|
| Process | 3 nm |
| CPU | 10 cores, up to 4.35 GHz |
| GPU | 16-core G2-Ultra NX |
| GPU claim (Xiaomi) | 85% faster / 64% less power |
| AnTuTu V11 | 5,228,014 — first past five million |
| Memory | CXMT LPDDR6, up to 12,800 Mbps |
| Displays | 7.58in inner / 5.38in outer |
| Camera | 200MP main + 50MP 3.5× telephoto |
| Starting price | ~10,999 yuan |
3. How to read the benchmark
5,228,014 is not "the chip's score." AnTuTu aggregates CPU, GPU, memory and UX, so it moves with the whole device.
| What is inside the score | Detail |
|---|---|
| Chip | Xring O3 |
| Memory | CXMT LPDDR6 at 12,800 Mbps — a direct contributor |
| Cooling | the foldable chassis's thermal design |
| Test conditions | not published (ambient temperature, sustained load) |
And "85 percent faster, 64 percent less power" has no stated baseline. Previous in-house part or competitor silicon are very different claims. Judging capability from one benchmark is the same problem AI models present (「What a coding benchmark is」).
4. Three gains, one loss
| Side | Detail |
|---|---|
| Gain ① Timing | no need to follow Qualcomm's calendar |
| Gain ② Differentiation | circuitry built for your camera pipeline and on-device AI (「What on-device AI is」) |
| Gain ③ Long-run cost | the vendor margin per handset disappears |
| Loss · Fixed cost | a leading-edge SoC runs to hundreds of millions of dollars. No volume, no recovery |
The last row is the whole decision. Design cost is spent before anything ships. Only makers selling tens of millions of units a year can absorb it, which is why the list is Apple, Samsung, Google, Huawei and Xiaomi.
5. The part that matters most in Korea is the memory
| Component | Sourced from |
|---|---|
| AP | Xiaomi, in-house |
| Memory (LPDDR6) | CXMT, China |
Design and memory both sourced domestically. With semiconductor export controls in force (「What AI chip export controls are」), that is simultaneously a performance play and a shortening of the supply chain. It sits on the same trend line as Chinese HBM3E appearing as a variable in Korean chip share prices (「Samsung and SK Hynix fall 4% (September 2)」·「What a memory supercycle is」).
What remains unresolved
- The GPU comparison baseline was not stated.
- The Xring O3's foundry could not be confirmed.
- The 10,999 yuan price appears in one report only.
- AnTuTu measurement conditions were not published.
- CXMT's real LPDDR6 volume and supply reliability could not be verified.
Sources
- GSMArena — Xiaomi 18 Fold with XRING O3 chip showcased at IFA 2026
- Android Authority — Xiaomi beats Apple to market with wide Xiaomi 18 Fold reveal
- TechTimes — Xiaomi 18 Fold debuts at IFA with XRing O3, first chip to clear 5 million AnTuTu
- Notebookcheck — Xiaomi's 18 Fold and Pad 9 Pro Max to launch on September 7 with the Xring O3
- Tech Startups — Top tech news today, September 8, 2026