The yen rally took Japan’s currency to its strongest level in more than a month on October 23, 2026, as concerns about artificial intelligence spending encouraged demand for safer assets. The yen strengthened 0.3% to 156.28 per dollar, while US Treasury yields hovered near a one-month low and the dollar traded close to its weakest level in almost three weeks.
Key Takeaways
- The yen was heading for a 1% weekly gain, its strongest weekly advance since early September.
- Brent crude exceeded $114 a barrel, leaving investors to weigh growth concerns against energy-driven inflation risks.
- Japan’s September core inflation exceeded the Bank of Japan’s 2% target ahead of its policy meeting the following week.
Table of Contents
- Yen rally accompanies a retreat in Treasury yields
- Oil and fiscal concerns produce different currency winners
- Japan’s inflation puts the policy outlook in focus
- Conclusion
Yen rally accompanies a retreat in Treasury yields
Friday’s currency moves followed an equity sell-off on October 22 as investors questioned the sustainability of the AI investment boom. The yen had recorded its strongest daily gain in almost a month that day, while buying of US government debt pushed yields sharply lower.
The US 10-year Treasury yield stood at 4.953%, near a one-month low. The dollar index was at 101.52 after touching 101.44 on Thursday, its lowest reading since the beginning of October.
ICE’s explanation of the dollar index’s six-currency basket shows how the benchmark measures the dollar against a fixed-weight group of currencies. That makes it a broader gauge than the dollar-yen exchange rate, although the two need not move by the same amount.
ING analysts cautioned that the bond rally might not last. They expected the 10-year yield eventually to return above 5%, citing inflation, fiscal deficits and AI investment trends, even as the risk-averse environment reduced pressure for a Federal Reserve rate increase the following week.
| Item | Details |
|---|---|
| Canadian dollar | Up 0.1% and stronger than C$1.40 per US dollar, its firmest level in a month. |
| Swiss franc | Steady at 0.8199 per US dollar, near its strongest level in a month. |
| Offshore yuan | Little changed at 6.6715 per US dollar, its strongest level in more than four years. |
| Euro | Broadly unchanged at $1.122. |
| Australian dollar | Steady at $0.7016. |
| New Zealand dollar | Up 0.1% to $0.5687. |
Oil and fiscal concerns produce different currency winners
Brent crude futures climbed above $114 a barrel after rising 4% in the previous session. Houthi attacks in Saudi Arabia had heightened concerns about further disruption to regional energy supplies.
The simultaneous rise in oil prices and fall in Treasury yields highlighted competing pressures: higher energy costs threatened inflation, while doubts about AI spending weighed on growth expectations and appetite for risk.
OCBC analysts distinguished between those risks rather than treating all defensive currencies alike. They said AI concerns favored the yen, higher oil prices supported the Canadian dollar and Norwegian crown, and French fiscal stress benefited the Swiss franc.
Concerns about France’s ability to manage its debt burden had also pressured French government bonds and weighed on the euro, which was broadly unchanged on Friday.
Japan’s inflation puts the policy outlook in focus
Japanese data released on October 23 showed annual core consumer inflation exceeded 2% in September for the first time in nine months. The reading added evidence of broadening price pressure ahead of the Bank of Japan’s policy meeting the following week.
Most economists polled expected the bank to hold rates at that meeting, followed by a quarter-percentage-point increase in December. Those were expectations, not announced decisions.
The European Central Bank was also expected to leave its benchmark rate unchanged at 2.5% the following week.
Conclusion
The next scheduled focus was the following week’s central-bank meetings, particularly the Bank of Japan’s decision after September’s inflation reading. The yen’s advance had strengthened, but expectations for a December rate increase remained a forecast rather than a policy commitment.
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