.NET 11 (STS) vs .NET 10 (LTS) — Which Should a Startup Choose in 2026?
Every November, .NET teams face the same question: stay on the proven LTS release, or jump to the fresh STS one? The advice the first page of search results hands you is almost always the same — "pick LTS, it's more stable." It's good advice. The problem is that it was written for a bank with a ten-year infrastructure-upgrade plan, not for a startup that ships to production several times a day and whose entire codebase fits in the heads of three people.
For a startup the equation is different, and surprisingly often the "right" answer is the opposite of the enterprise default. Let's work through it on the facts, without dogma: what LTS and STS actually mean in 2026, where the real decision line sits, and what you'd want to choose in the typical scenarios.
What LTS and STS actually mean
First, clear up the confusion, because half the arguments come from misunderstanding what you're even choosing.
Microsoft ships a new major .NET every November. Even-numbered versions (8, 10, 12…) are LTS, supported for 3 years. Odd-numbered ones (9, 11, 13…) are STS. And here's the recent, important wrinkle: in 2025 Microsoft extended STS from 18 months to 24 months, starting with .NET 9. So the "short" support window isn't all that short anymore.
The quality of the releases is identical — the only difference is the support length, not the "reliability" of the code. STS does not mean "raw" or "beta"; it's a full production release with a shorter patch window.
Now do the concrete math, because it reshapes the whole picture. .NET 10 (LTS) shipped in November 2025 and is supported until roughly November 2028. .NET 11 (STS) is expected in November 2026 and, with the 24-month window, runs to roughly November 2028 — almost the same date as .NET 10. The paradox: the "short-support" version that shipped a year later ends at about the same time as the "long" one. That's a direct consequence of the STS extension, and it's the fact that neutralizes the headline argument for LTS for a lot of teams.
As of late May 2026, .NET 11 is in preview (already its fourth iteration), with the final release due in November.
Why "pick LTS" is enterprise advice
The arguments for LTS are entirely real — but notice who they're written for. Big companies upgrade rarely and painfully: annual budget cycles, compliance, audits, 24–36 month hardware-and-software refresh plans. For them, every runtime upgrade is a project with sign-offs, and three years of support means you can install a version once and not touch it for three years. In that context, LTS is pure savings on organizational overhead.
A startup is built the opposite way. It already ships constantly, the codebase is small, there's almost no process, and the decision to "upgrade the runtime" is made by one person in one sprint rather than by a committee. The very costs that make LTS valuable to an enterprise are close to zero for a startup — which means the reason to pick LTS "by default" is weaker than it looks.
The case for .NET 11 (STS) for a startup
If your upgrade costs are low, then you're paying a very real price for LTS "stability" — you're giving up the new stuff. And the new stuff in .NET 11 is substantial.
The headline for async-heavy backends is Runtime Async: native runtime-level support for asynchrony that produces cleaner stack traces and lower overhead. For a service that lives on async/await, that's a direct win in observability and performance. Add the new C# 15 features, JIT and runtime improvements, and CoreCLR becoming the default for Android builds. For a greenfield project all of this is free: you simply start on the newest release and get the better toolchain from day one.
A separate, underrated argument is AI and out-of-band tooling. Packages like .NET Aspire, Microsoft.Extensions.AI, and the C# Dev Kit evolve outside the annual cycle and periodically pull in newer dependency versions. A startup building AI features and observability on Aspire naturally ends up closer to the leading edge — and on a fresh runtime that's simply less friction. In fact, the trouble LTS-only teams hit with exactly these dependencies was one of the reasons Microsoft cited for extending STS.
Layer on hiring (developers would rather work on a current stack) and the ecosystem (libraries and samples track the newest versions faster), and for most startups the scale tips toward newness.
When a startup should still stay on LTS
This isn't an unconditional "always take STS." There are a few situations where LTS is the right call even for a startup, and it's fairer to name them outright.
If you can't guarantee a yearly upgrade — no bandwidth, no discipline, the team is permanently firefighting — take LTS: the extra year-plus of support runway covers you. If you ship installable software (on-prem, desktop, an SDK, customer-run images) where the runtime is controlled by a customer who upgrades slowly, LTS makes life noticeably easier. If a critical dependency lags behind the newest .NET, wait for the ecosystem to catch up. And if you fall under regulatory/compliance requirements where "the version must be LTS" is written into a customer contract, the choice is made for you.
The real cost is the upgrade tax, not the support window
Here's the key mindset shift: the LTS-vs-STS debate is usually fought over support timelines, but the real cost hides elsewhere — in the cadence of upgrades. Choosing STS is an implicit commitment to upgrade roughly once a year. Major .NET upgrades are usually smooth (it's one of the platform's strengths), but "smooth" isn't "free": you still have to budget time for the upgrade, a test run, and a dependency check.
The good news is that the new 24-month STS window removes the most painful part of the old setup — the mid-cycle "upgrade now or fall out of support" scramble. You now have enough runway to schedule the upgrade when it suits the team, not when Microsoft's calendar forces it. For a startup, that turns an upgrade from a fire drill into a routine backlog item — and routine items are cheap.
A practical decision
Reduce it to a simple framework. Answer one honest question: can we comfortably upgrade the runtime about once a year?
If yes — and for a cloud SaaS startup with continuous deployment the answer is almost always yes — start on the newest release (today that's .NET 10; from November, .NET 11) and treat the annual upgrade as an ordinary backlog item. You get better performance, the freshest C#, current AI tooling, and a happier team, for a small predictable tax.
If no — or if you ship installable/regulated software, or depend on a lagging library — stay on the current LTS. The support runway and the freedom from a forced yearly upgrade matter more than the newest features.
And for greenfield specifically: a new project is almost always worth starting on the newest version available at the time. In a startup, the cost of falling behind always exceeds the cost of upgrading.
Frequently asked questions
What is the difference between LTS and STS in .NET?
Major .NET versions ship every November. Even-numbered ones (such as .NET 10) are LTS, supported for 3 years. Odd-numbered ones (such as .NET 11) are STS, whose support was extended from 18 to 24 months in 2025. The quality of the releases is the same; only the length of free support and patches differs.
How long are .NET 10 and .NET 11 supported?
.NET 10 (LTS) shipped in November 2025 and is supported for about three years, to roughly November 2028. .NET 11 (STS) is expected in November 2026 and, with the 24-month window, is supported to roughly November 2028 — almost the same date as .NET 10, despite its STS status.
Should a startup choose STS or LTS?
If the startup can upgrade its runtime about once a year — which is usually true for a cloud SaaS with continuous deployment — it's wiser to start on the newest version for the performance, the latest C#, and current tooling. LTS makes sense if you lack bandwidth for regular upgrades, ship installable or regulated software, or depend on a lagging library.
Is an STS release safe for production?
Yes. STS is a full production release of the same quality as LTS; it differs only in having a shorter support window. "STS" does not mean "beta" or "unstable."
What is the real cost of choosing STS?
Not the shorter support, but the implicit commitment to upgrade roughly once a year. The .NET upgrades themselves are usually smooth but still take time for the upgrade, tests, and dependency checks. Extending STS to 24 months removes the pressure to upgrade mid-cycle and lets you schedule the upgrade when it suits the team.
