BYD’s 4nm Chip and Full-Liability Autonomy: A Risky Bet as Margins Shrink

BYD has thrown down a marker that few automakers have dared to match. At a technology event in Shenzhen on May 28, the Chinese giant unveiled two blockbuster announcements: China’s first homegrown 4-nanometer autonomous driving chip and a pledge to accept full legal liability for any accident involving its “God’s Eye” system in city traffic. The combination of technological ambition and legal audacity is rare in the industry — but it comes at a time when BYD’s core vehicle business is buckling under price pressure.

The Xuanji A3, a 4nm chip designed entirely in-house, is already in mass production. In a three-chip cluster configuration, it delivers over 2,100 TOPS of computing power — a figure that leaps past rivals such as Li Auto’s Mach 100 (1,280 TOPS) and Xpeng’s Turing chip (750 TOPS). BYD claims it is the first Chinese-made 4nm chip for intelligent driving, developed by a team of more than 7,000 engineers across four research centres. The power consumption is 20% lower than comparable systems, and optimised algorithms have boosted compute efficiency by 100%. Latency between cockpit, driver assistance and drivetrain has been slashed to just 8 microseconds. Citi analysts estimate the total hardware cost of BYD’s solution at roughly one-third of an equivalent Nvidia Thor platform — a cost advantage that could be decisive in China’s hypercompetitive volume market.

The liability pledge is arguably the more provocative move. BYD will assume full legal responsibility for accidents caused by its God’s Eye A and B systems in urban autonomous driving mode, with no upper cap on compensation, valid for one year. No other global automaker has offered such blanket coverage. The bet is underpinned by an enormous data advantage: already 3.15 million BYD vehicles equipped with intelligent assistance systems are on Chinese roads, generating over 200 million kilometres of driving data daily. That real-world feedback has helped push the adoption of the intelligent parking function from 21% to 93%. The God’s Eye B package, which includes LiDAR, is now available across the entire model lineup — even the entry-level Seagull — for a flat fee of 12,000 RMB (roughly $1,660).

Should investors sell immediately? Or is it worth buying BYD?

Yet the stock market’s reaction has been muted. BYD’s Hong Kong-listed shares (1211.HK) closed Friday at 91.30 HKD, up 1.11% on the day, with turnover of around 51 million shares. The session range of 89.15–93.30 HKD underscores the stock’s proximity to its 52-week low of 88.50 HKD — a far cry from the year’s peak of 143.60 HKD. The tepid response reflects a first quarter that dealt a heavy blow to earnings: net profit collapsed 55.4% year-on-year to 4.08 billion yuan, while revenue slipped 11.82% to 150.22 billion yuan. The profit slump was the sharpest since 2020, and the pressure is concentrated on budget models below 150,000 yuan, where rivals Geely and Leapmotor have been particularly aggressive.

BYD’s vehicle sales fell for the eighth consecutive month in April, down 15.5% from a year earlier. Overseas sales, however, offered a rare bright spot, jumping 35% to 130,000 units. That divergence highlights the two-speed nature of BYD’s current story: domestic price wars are squeezing margins, while international expansion and technology differentiation provide longer-term ballast.

Analysts remain broadly bullish on the technology narrative. CLSA and Citic Securities reaffirmed buy ratings in late May with price targets of 130 HKD each. DBS set a slightly higher target of 135 HKD, implying upside of roughly 48% from Friday’s close. They argue that the chip and liability strategy will eventually translate into stronger customer trust and lower system costs — but the earnings data must catch up first.

BYD has committed to investing more than 100 billion yuan (around $14.75 billion) over the next three years in intelligent technologies. The company also plans a major over-the-air update for the God’s Eye C system in December 2026. Meanwhile, it has already deployed humanoid robots — the AgiBot A2, with 200 TOPS of compute power — in its own production facilities to further automate manufacturing. The next key test for investors will come on June 2, when BYD releases May sales figures. Whether the autonomy narrative can offset the drag from shrinking volumes will determine if the stock can break out of its recent funk.

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