〔Day Digest〕Hot 3.7% CPI Briefly Pushed October Hike Odds Near 50%, but CoreWeave Credit Crack Pulls 10Y Down 10bp to 5.08% — Russell 2000 Enters Correction, KOSPI Triggers Sidecar, Bonds Re-Hedge

0. Weekly Arc

Hot September CPI arrived with October hike odds briefly breaching ~50%, yet the 10Y sank 10bp to 5.08% — a three-week low — and the 5Y fell over 6bp to ~4.93% ^[1][2][3][4]. The mechanism flipped from a "stocks down, yields up" rates trade to a "stocks down, yields down" credit-hedge trade ^[2][3]. Russell 2000 entered a technical correction on the same session ^[5].

1. The Mechanism: AI Credit Crack Re-Flips Treasuries Into a Hedge

• **[ESCALATED] CoreWeave credit rupture:** 2032 bond yields above 15%, 5Y CDS widened 135bp, implied 5Y default probability 63%; stock fell 15-17% intraday ^[2][3][6]. Issuance from par just four months ago ^[3].
• **[NEW] BofA derivatives team:** framed the Oct 8 OpenAI revenue flash and the Oct 14 CoreWeave slide as the "best rehearsals for AI deleveraging" — both saw equities and yields fall together, breaking the prior "stocks down, yields up" pattern ^[2].
• **[ONGOING] Demand backstop:** Fed reinvestment buying at $10B+ scale plus institutional lock-in at elevated yields kept a bid under Treasuries despite hot CPI ^[1]. BlackRock CEO Larry Fink separately flagged a US capital shortage ^[7]; JPMorgan CEO Jamie Dimon warned federal debt can drive bond volatility ^[8].

2. Inflation Read: Hot Print, Muted Pass-Through

• **[NEW] September CPI above consensus:** headline +3.7% y/y, core +2.6% y/y, with energy and services jointly lifting the print ^[9][6].
• **[NEW] Beige Book (Oct release):** high oil prices exerting a broad impact on activity; manufacturing growth concentrated in AI-linked sectors ^[10][11].
• **[NEW] WTI above $95/bbl** layered a supply-shock premium on top of the CPI beat ^[6].
• **[NEW] Tonight, 20:30 ET:** US September PPI and retail sales — the next hard test of pass-through and consumer resilience ^[12].

3. Fed Path: October Hold 74.5%, December +25bp at 78.5%

• **[NEW] OIS/CME path:** October hold 74.5%, December +25bp implied 78.5%; "delay is still the base case, the debate is whether action comes earlier" ^[13].
• **[NEW] First-pass post-CPI spike:** October hike odds briefly pushed near 50% ^[5][14][6], then receded as the equity-credit leg dominated the session ^[14][13].
• **[NEW] Tail view (single source):** a forecaster early to call the last hike now sees a possible 50bp December move ^[15]. Thin — one named forecaster, not a desk consensus ^[15].
• **[ONGOING] Macro backdrop:** a $2T deficit and 5%+ yields are raising borrowing costs for households and the federal government ^[16].

4. Cross-Asset Stress Map

• **[NEW] US equities:** Nasdaq 100 -2% (biggest single-day drop in 3 months), Philadelphia chip index -4.3% (sixth straight loss, longest streak in roughly 2 years), Russell 2000 -1.9% and now in technical correction at -11% from the August high; 200-day moving average broken for the first time since March ^[5][6].
• **[NEW] Asia:** KOSPI opened -5.6% to -6% and triggered Sidecar circuit breakers on both KOSPI and KOSDAQ, suspending program selling; SK Hynix -9%, Samsung -6%, Nikkei 225 -3%, SoftBank -8%, MSCI Asia Pacific down over 3% in places ^[3][17].
• **[NEW] FX and commodities:** DXY at an 18-month high; gold stabilized near $4,140/oz after a three-day slide; BTC under $82,000; WTI above $95/bbl ^[3][6].
• **[ONGOING] Global rates:** Eurozone Bund yields slid to multiweek lows alongside Treasuries, confirming a global bond bid rather than a US-only move ^[18].

5. Falsifiers and Source Quality

• The bonds rally is a credit hedge, not a dovish bet: if tonight's PPI and retail sales print firm and equities stabilize, the 10Y's drop can reverse quickly ^[12][14].
• Source quality: the December 50bp view is single-source ^[15]; the October hike-odds path is a band — spike near 50% intraday, settle back inside the OIS hold-implied range ^[5][14][13]. Quote the band, not a point.
• Counter-narrative: Barclays' Stefano Pascale and 22V Research's Dennis DeBusschere flag small caps as the rate-sensitive pain point, not the AI complex — the Russell 2000's break of the 200-day confirms the small-cap leg ^[5]. The bonds bid can persist even if the AI leg stabilizes, as long as growth-sensitive equities keep selling off ^[2][5].
• Sourcing caveat: the September 10Y-5.09% print from ^[2][3] and the 5.08% prints from ^[1][4] sit within the same Asian-session tape and are treated as one move, not two.