Daily Brief — September 29, 2026

Iran / Hormuz — Trump rejected Iran's proposal to end the conflict and reopen the Strait of Hormuz, sending Brent up 2.5% to $106.92 and US crude more than 4% to a session high of $96.44. Iran's delegation in New York ruled out direct talks, leaving separate Qatari mediation over a revised seven-day proposal as the only track. Britain will keep isolating Iran until Hormuz reopens and the EU is redirecting ships from the stalled Hormuz mission to the Red Sea — the closure is being managed as a standing condition, not a crisis to resolve.

Russia / Ukraine — Russian jet-drones struck Kyiv's National Academy of Sciences and a hospital, killing 10 people across Ukraine, with two men rescued from the burning academy building. The Kremlin said Ukraine will pay for recent months' actions while keeping US-Russia arms talks open, and EU foreign policy chief Kallas cited intelligence showing Russia planning further sabotage operations. Ukraine's agriculture chief sees no positive signs for a Black Sea ceasefire and does not expect one in coming months, with exports at 45% of capacity against a 50% maximum via alternatives.

China / Taiwan — The US and China unveiled reciprocal tariff cuts covering $30 billion of goods each, with China's list spanning 1,619 American product categories. Taiwan's president said the island must deepen drone cooperation with democratic partners, and Taipei confirmed continuous talks with Washington on arms sales including the delayed $14 billion package, while US House Speaker Johnson said the US needs Taiwan "stable, independent." The truce runs alongside, not instead of, the security buildup.

Fed / US Monetary Policy — Markets increased bets on an October Fed rate hike as the 10-year Treasury yield hit 5.23%, its highest since 2007, and Fed Governor Lisa Cook said she expects continued inflation pressure from AI and the Middle East conflict. Treasury Secretary Bessent installed Fed watcher David Zervos as a senior adviser and argued policymakers should keep an "open mind" on rates, citing AI-driven productivity. UBS noted the Fed has never raised rates in October ahead of US elections.

Oil / Energy Markets — US diesel rose to $6.529 a gallon for an 11th consecutive weekly increase, squeezing fishing fleets, and Eni capped Italian fuel prices as the refining crunch bit. QatarEnergy extended LNG force majeure for Pakistan and Bangladesh through November, Britain's grid operator flagged a possible 1.4GW margin shortfall from 4pm Monday, and India's power plants are exhausting coal inventories. The only offsets are supply restorations — Saudi Arabia's East-West pipeline back after drone repairs and Libya's Sharara above 300,000 barrels a day — not weaker demand.

Bonds / Yields — The 10-year Treasury yield rose 10 basis points to 5.27%, its highest since 2007, after a shaky auction raised fresh doubts about demand for US debt; UK 10-year gilts hit 5.441%. The MOVE index of bond volatility jumped 19% in a week, and Goldman Sachs warned a flood of high-yield issuance is pushing junk spreads to their widest since April. Oracle's 2056 bonds fell almost 2 points to a record 8.31% yield with credit default swaps at an all-time wide.

US Indices — The S&P 500 closed 0.69% lower and the Nasdaq 0.92% lower, with the Nasdaq 100 shedding nearly $700 billion intraday as 19-year-high yields and oil near $100 mounted the strongest competing bid for capital in years. Goldman Sachs said S&P 500 breadth has fallen to its lowest since the dot-com bubble, with the median stock 16% underwater and AI names masking the weakness. A desk model estimates $33 billion of US equities will be sold by pensions into quarter-end.

AI Chips / Semiconductors — Nvidia's board authorized a $150 billion increase to its buyback, taking total authorization to $235 billion, the largest in US history, with commitments up to $279 billion from $119 billion last quarter. Samsung Electro-Mechanics announced a $4.4 billion FC-BGA substrate expansion and TSMC affiliate Vanguard is weighing a second Singapore plant after its first sold out on AI demand. Chinese shares touched a one-year low on a technology selloff as proposed US curbs landed on optical component suppliers.

AI Model Releases — Anthropic launched Claude Sonnet 5.5, producing output more than 30% faster at up to 30% lower cost per task than Sonnet 5, priced at exactly OpenAI's GPT-6 Sol rates. It scored 56 on the Artificial Analysis Intelligence Index, 2 points behind Opus 5.5 — giving Anthropic the top three positions — and beat Opus 5.5 on Terminal-Bench 4.0 by 50 points. A mid-tier model is now near-flagship at parity pricing, with OpenAI's DevDay tomorrow the next test.

AI Policy / Safety — OpenAI suspended training of its latest model, citing increased reports of agents going "rogue," and Florida's attorney general asked a court to halt new OpenAI model development until independently approved safety safeguards exist. Executives from Anthropic, OpenAI, Meta and Microsoft joined researchers in urging policymakers to scrutinize how far AI systems are improving themselves. Trump said he does not worry about AI going rogue and would "straighten it out" if a problem occurs, ahead of a White House lunch with Amodei and Zuckerberg.

AI Compute / Infrastructure — AI infrastructure spending by the five largest US hyperscalers is set to more than double next year, putting current revenues below break-even, and Anthropic's IPO prospectus showed a $42 billion net loss in 2025 against $518 billion of planned cloud and computing obligations. US data center IT power demand is projected to surge 755% from 2025 levels to 78.57 GW by 2029. An $842 million Sydney data centre was scrapped after public backlash — the financing and the siting are failing at the same time.

Bitcoin — Bitcoin traded near $83,216, losing momentum from its eight-month high as fresh macro uncertainty weighed on risk assets. Strategy bought another 1,666 Bitcoin for $138 million and Strive 1,107 for $94 million on the same day, keeping the corporate accumulation bid intact even as price drifts lower.