OKLO vs VST: How Oklo and Vistra Compare (2026)

Same yardstick, side by side (as of August 2026). Valuation lined up like this is most meaningful for two names in the same corner of the market, which these are. Figures are approximate; verify before investing.

The metrics above tell you which is the marginally better business. The bigger risk for most people is not picking the slightly worse stock, it is over-concentrating. OKLO and VST share themes, so owning both, or adding either to what you already hold, can quietly push a large share of your portfolio into one bet.

This is the part a generic comparison page cannot answer, because it depends on what you own. Connect your brokerage and Walnut shows your real, combined OKLO and VST exposure, flags overlap with your existing positions, and tells you if adding one would tip you past a concentration you are comfortable with, read-only by default, with your login staying at your broker. Walnut is not an investment adviser.

Oklo (OKLO) is a US advanced-nuclear company developing small modular fast reactors, branded the Aurora powerhouse, intended to deliver clean baseload electricity from compact, factory-buildable units. Its model is to own and operate the plants and sell power under long-term agreements rather than just sell reactors, positioning it as a power provider for data centers, industrial users, and grid customers. Oklo also pursues recycling of used nuclear fuel as part of its long-term plan. The company is pre-revenue: it has no operating commercial reactors generating power yet, and its value rests on advancing reactor design, securing US Nuclear Regulatory Commission licensing, building a supply chain and fuel access, and converting a pipeline of customer interest into deployed, revenue-generating plants. Oklo became publicly traded through a SPAC merger and trades on the New York Stock Exchange. It is closely associated with the AI-driven surge in electricity demand and the broader nuclear revival, which makes it a high-profile but speculative early-stage holding.

Full OKLO guide

Vistra (VST) is one of the largest competitive power generators and retail electricity providers in the United States. It owns a diverse fleet of generation assets including natural gas, nuclear, coal, solar, and battery energy storage, and it sells electricity to homes and businesses through retail brands such as TXU Energy. Vistra is a major operator in the Texas (ERCOT) market and other competitive markets, and its acquisition of Energy Harbor added a sizable nuclear fleet, strengthening its position as a supplier of reliable, low-carbon baseload power. The company has become a prominent way to play surging electricity demand from data centers and artificial intelligence, since its nuclear and dispatchable generation can serve large, always-on loads. Vistra pays a dividend and has been returning capital through buybacks. Headquartered in Irving, Texas, VST is an independent power producer whose results are tied to power prices, demand growth, and its generation mix.

Full VST guide

Both fit overlapping themes, but they are not interchangeable. The useful comparison is which set of drivers and risks you want exposure to.

• OKLO drivers: AI-era electricity demand; Own-and-operate power model.
• VST drivers: Data-center and AI power demand; Nuclear and dispatchable fleet.

A faster-growing, richer-valued name usually swings harder, so it suits a longer horizon and a higher tolerance for volatility; a steadier, more cash-generative business suits a more conservative or income-minded investor. The honest test is which set of risks you could hold through a drawdown: Oklo is pre-revenue with no operating commercial reactors, so it carries substantial execution risk: NRC licensing is rigorous and can take years, first-of-a-kind nuclear construction often runs over budget and behind schedule, and fuel supply (especially HALEU) is a real constraint. For VST, as a competitive (unregulated) power generator, Vistra's earnings are sensitive to wholesale power prices, fuel costs, and weather, making results more volatile than a regulated utility with guaranteed returns.

Growth-minded investors who believe the theme has years to run tend to accept the richer multiple for more upside; value-minded investors lean toward the cheaper forward earnings and steadier profile. Pick OKLO if you believe its drivers more; VST if you believe its. Many investors hold both, but since they share themes, that is a concentrated bet, not diversification. Decide deliberately and check overlap. For the full detail, see the OKLO and VST guides.

OKLO. Oklo cannot be valued on current earnings because it is pre-revenue; the market prices it on the size of the clean-power opportunity, its customer pipeline, and the probability of licensing, financing, and deploying reactors. Traditional P/E does not apply, and the stock is highly speculative and volatile, often moving with nuclear-theme and AI-power sentiment. All figures are approximate and should be verified against the latest filings.

VST. Vistra is valued as an independent power producer whose earnings track wholesale power prices, demand, and its generation mix, so it is more cyclical than a regulated utility. The stock has re-rated alongside enthusiasm for AI and data-center electricity demand, which adds both upside and the risk of multiple compression if that demand underdelivers. All figures are approximate and should be verified against current filings.

Headline figures (approximate, early 2026): OKLO shows stage Pre-revenue advanced-nuclear developer (no operating commercial reactors), core product Aurora powerhouse small modular fast reactor, business model Own and operate plants, sell power under long-term agreements, revenue (ttm) Minimal to none from power sales (approximate, verify); VST shows business Competitive power generation + retail electricity, generation mix Natural gas, nuclear, coal, solar, battery storage, revenue (ttm) ~$15-20 billion (verify), key markets Texas (ERCOT) and other competitive US markets.

OKLO and VST are related but distinct: same themes, different businesses and risks. Neither wins in the abstract; the right pick is whichever thesis you actually believe, sized so you are not over-concentrated in one theme. Walnut can show your combined OKLO and VST exposure against your real portfolio. It is not an investment adviser.