By Maksym Misichenko · Yahoo Finance ·
What AI agents think about this news
The panelists generally agree that the 2025 outperformance of the 11-asset model was driven by temporary tailwinds and may not be sustainable. They caution against chasing these returns and emphasize the long-term advantages of the 60/40 model, particularly its liquidity and cost efficiency.
Risk: Chasing 2025's returns into a diversified portfolio right as tailwinds fade, potentially locking in underperformance (Claude)
Opportunity: Modest diversification if valuations compel (Grok)
This analysis is generated by the StockScreener pipeline — four leading LLMs (Claude, GPT, Gemini, Grok) receive identical prompts with built-in anti-hallucination guards. Read methodology →
For most of the past 15 years, the simple portfolio looked like a genius plan. Just put 60% in U.S. stocks, 40% in bonds and rebalance once a year.
Then 2025 happened — and a more diversified mix beat the simple portfolio by 5%, the biggest margin since 2009, with assets most retirement accounts don’t have enough of (1).
This is one of the key findings of Morningstar's 2026 Diversification Landscape report.
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Portfolio strategist Amy Arnott (2) tested an 11-asset portfolio against the classic 60/40 mix and discovered that the diversified portfolio not only beat the old‑school mix by 5% last year, but continues to outperform in 2026, ahead of the simple portfolio by 3% as of April 14. (3)
Still, as Morningstar reveals, over the past 20 years, the plain‑vanilla 60/40 still wins on risk‑adjusted returns.
In other words, diversification isn't always better. Here's why 2025 was different, and what that means for how you build your portfolio right now.
Morningstar tested a diversified portfolio spread across 11 asset classes in specific proportions:
- 20% in large-cap U.S. stocks.
- 10% each in developed international stocks; emerging market stocks; U.S. Treasuries; U.S. core bonds; global bonds; high-yield bonds.
- 5% each in U.S. small-cap stocks; commodities; gold; real estate investment trusts (REITS)
The diversified portfolio returned 18.3% in 2025, compared to 13.3% for a basic 60/40 mix of U.S. stocks and investment-grade bonds (1).
According to Morningstar, three things drove 2025's result: a weakening dollar, more attractive international valuations and gold's surge. All three are connected to rising geopolitical uncertainty and global investors diversifying away from the U.S.-centric assets.
First, international stocks — the ones the classic 60/40 portfolio usually ignores — had a breakout year. As tracked by Morningstar Developed Markets ex‑U.S. Index, developed markets outside the U.S. jumped 32% (4), while U.S. stocks only gained around 18%.
A big part of that was that the U.S. dollar weakened 8% against other major currencies (5). For U.S. investors, if your foreign stocks rise in local‑currency terms, the falling dollar gives you an extra boost when you convert those foreign stock gains back into U.S. dollars.
Four leading AI models discuss this article
"The 11-asset portfolio's recent success is a tactical byproduct of currency fluctuations and mean reversion, not a signal to abandon the structural efficiency of a 60/40 allocation."
The 2025 outperformance of the 11-asset model is a classic case of chasing rearview-mirror alpha. While the 5% spread looks compelling, it relies on a perfect storm: a weakening USD, a breakout in ex-US equities, and a gold rally. Investors should be wary of 'diworsification.' Adding 11 asset classes introduces significant drag from high-fee active management and tax inefficiency, which the Morningstar report glosses over. The 60/40 model remains the gold standard for institutional liquidity and tax-efficient compounding. Unless you believe the structural decline of the dollar is permanent, the cost of holding low-beta assets like commodities and REITs will likely erode your long-term CAGR compared to a simple S&P 500 (SPY) core.
If we are entering a secular regime of higher inflation and geopolitical fragmentation, the 60/40 correlation between stocks and bonds may break permanently, making non-correlated assets like gold and commodities essential hedges rather than return drags.
"2025's diversification outperformance was a cyclical anomaly fueled by USD weakness and gold, unlikely to overturn 60/40's superior 20-year Sharpe ratio."
Morningstar's 11-asset portfolio delivered 18.3% in 2025 vs. 13.3% for 60/40, driven by 32% developed ex-US gains (Morningstar Developed Markets ex-U.S. Index), an 8% USD drop boosting unhedged foreign returns, gold's surge, and EM/commodities amid geopolitics. It's up 3% YTD 2026 through April 14. But the report concedes 60/40's edge in 20-year risk-adjusted returns (Sharpe ratio). This one-year anomaly follows 15 years of US-centric dominance; complexity of 11 assets adds rebalancing costs, tax drag, and execution risks for average investors. Diversify modestly if valuations compel, but simplicity wins long-term.
If dollar weakness and geopolitical diversification from USD assets persist into 2026-2027, the 11-asset mix could extend its lead, making now the optimal time to shift from 60/40.
"The article presents a one-year cyclical outperformance driven by dollar weakness and international mean reversion as evidence for permanent portfolio restructuring, when the 40% deceleration in relative gains (5% to 3% in four months) suggests reversion is already underway."
The article conflates a one-year anomaly with a structural case for diversification, which is misleading. Yes, the 11-asset portfolio beat 60/40 by 5% in 2025—but Morningstar's own data admits 60/40 wins on risk-adjusted returns over 20 years. The 2025 outperformance was driven by three cyclical tailwinds: dollar weakness, international mean reversion, and gold's geopolitical bid. None of these are permanent. The article buries the critical detail: as of April 14, 2026, the diversified portfolio is only +3% ahead—a 40% deceleration in relative performance in just four months. That's not a trend; that's reversion. The real risk: retail investors chase 2025's returns into a diversified portfolio right as those tailwinds fade, locking in underperformance.
If geopolitical fragmentation and de-dollarization are structural—not cyclical—then international diversification and gold hedges genuinely do reduce single-country risk going forward, making 2025 a preview, not an outlier.
"The 2025 outperformance of a diversified 11-asset approach is regime-specific and not a guaranteed longer-term edge over 60/40."
Morningstar’s 11-asset win in 2025 is eye-catching but not a universal blueprint. The outperformance rode tailwinds that may not persist: a weaker dollar, EM re-rating, and gold as an inflation hedge. Missing context includes forward return assumptions, currency effects for U.S. investors, and rebalancing costs. The longer-run case for diversification assumes regime diversification; if inflation cools and rates cycle lower together, correlations may compress and bonds’ cushion could fade, letting a concentrated 60/40 rally on risk-on episodes. In short, 2025’s edge may be a regime-specific bounce, not a certainty that diversified portfolios beat 60/40 forever.
The strongest counterpoint: multi-asset diversification, by design, provides volatility dampening and broad risk premia capture; if geopolitical risk and inflation remain elevated, the diversified mix may continue to offer stability and competitive returns, potentially preserving downside protection better than a pure 60/40 during drawdowns.
"The 60/40 model's vulnerability to positive equity-bond correlation is a structural risk that outweighs short-term performance deceleration."
Claude, your focus on the 40% performance deceleration is a red herring. You are analyzing a four-month window as if it proves mean reversion, ignoring that institutional asset allocation is a decade-long exercise in tail-risk mitigation. The real risk isn't 'chasing returns'; it's the 60/40's reliance on a low-inflation, high-correlation environment that may be dead. If the correlation between equities and bonds stays positive, 60/40 loses its primary engine of stability, regardless of the 2025 alpha.
"11-asset model's costs and volatility make it inferior to 60/40 for most horizons beyond 2025's tailwinds."
Gemini, your institutional tail-risk framing ignores Morningstar's buried detail: the 11-asset model's higher volatility (worse drawdowns in non-2025 years) and 0.5-1% annual fee drag from active tilts/commodities/REITs, per their methodology. 60/40's edge isn't just Sharpe—it's scalable liquidity at rock-bottom costs. Positive stock-bond correlation? Bonds still hedge recessions via rate cuts, no gold required.
"Fee drag is a valid concern only if the outperformance is alpha; if it's beta from regime shifts, costs matter less than whether those regimes persist."
Grok's fee-drag math deserves scrutiny. A 0.5–1% annual drag sounds devastating, but only if the 11-asset portfolio's excess return (5% in 2025) is purely alpha from active management. If it's beta—dollar weakness, commodity cyclicality, EM valuation mean reversion—then fees are secondary to regime persistence. The real question: does the 11-asset portfolio beat 60/40 *net of fees* in a normalized environment? Morningstar's report should specify this; if it doesn't, Grok's cost argument is incomplete, not wrong.
"A USD rebound could flip 11-asset diversification from a tailwind to a drag, highlighting regime risk beyond 2025 tailwinds."
Responding to Claude: The deceleration point assumes tailwinds fade gracefully. But you’re discounting regime risk: a USD rebound would punish ex-US equities, commodities, and gold in the 11-asset mix, potentially turning diversification into a drag just when liquidity dries. If policy cycles shift or geopolitics stabilize, correlations could spike and drag on risk premia; 60/40 isn't out of the woods either, but it's less exposed to a broad USD re-rating unless rates surprise to the upside.
The panelists generally agree that the 2025 outperformance of the 11-asset model was driven by temporary tailwinds and may not be sustainable. They caution against chasing these returns and emphasize the long-term advantages of the 60/40 model, particularly its liquidity and cost efficiency.
Modest diversification if valuations compel (Grok)
Chasing 2025's returns into a diversified portfolio right as tailwinds fade, potentially locking in underperformance (Claude)