Which Unity Version Should You Use in 2026? 6.3 LTS vs 6.6 Explained

Open Unity Hub, click “Install Editor”, and you’re looking at a list of version numbers that starts with 6000 and includes words like LTS, Update, Beta, and Alpha. Pick wrong and you’ll either be missing features you need or fighting bugs that were fixed in a version you didn’t install — or, worst case, discover mid-project that your target platform doesn’t support the editor you built everything on. Here’s how to choose, and why the answer is usually simpler than the list makes it look.

Decoding Unity’s Version Numbers

Since Unity 6 the version scheme is 6000.MINOR.PATCH — for example 6000.0.32f1. Reading it left to right:

• 6000 is the major generation: Unity 6. Earlier editors used the year (2022.3.x, 2021.3.x).
• The minor number is the release stream within Unity 6: 6000.0 is the original Unity 6 release, 6000.1, 6000.2, and so on are the updates that followed. Unity markets these as “Unity 6.1”, “Unity 6.2”, etc.
• The patch number is a bug-fix release. Higher is better, always. There is no reason to install 6000.0.10 when 6000.0.32 exists.
• The suffix — f1 means final/release, b is beta, a is alpha. Never ship on a b or a.

LTS vs. Update Releases: The Only Distinction That Matters

Every Unity release stream is one of two kinds, and this is the decision that actually affects your project:

• LTS (Long-Term Support) streams get bug fixes and security patches for roughly two years after release, with no new features added. The API is stable for the whole window. This is where shipping games live.
• Update (formerly “Tech Stream”) releases bring the new features — new rendering options, new packages, new editor tools — but are supported only until the next release replaces them, typically a few months. They’re for evaluating what’s coming, and for projects that specifically need a new feature and accept the churn.

As of October 2026, the current LTS is Unity 6.3 LTS (6000.3), supported until December 2027, and it is the right default for almost every new project. Unity 6.0 LTS (6000.0) reaches the end of its support in October 2026. The newest release overall is Unity 6.6, an Update release. Unity’s Unity 6 support page lists the support dates and the LTS release page lists the latest patch. Check them before you install, because these numbers change every few months.

The Decision Tree

Starting a new project → newest LTS

No exceptions worth mentioning. You get the longest support window ahead of you, the most current platform SDK support (which the app stores increasingly require), and the widest Asset Store compatibility going forward. Install the highest patch number of that stream.

Mid-project on an older LTS → stay, unless there’s a reason to move

“Because a newer version exists” is not a reason. Reasons that are: your platform’s SDK or store requirements now demand it (Google Play and the App Store raise minimum target API levels annually), a bug you’re hitting is fixed upstream, or your LTS is about to leave support and you have months of development left. Unity 2022 LTS was the safe baseline for years, but it is at the end of its support window — if you’re still on it, plan the migration to a 6000.x LTS deliberately rather than being forced into it.

Need a brand-new feature → Update release, eyes open

If a specific capability only exists in the newest Update stream and your project genuinely depends on it, use it — but understand that you’re signing up to move to the next release when it arrives, and that Asset Store packages may lag behind. Keep the project small or the timeline short.

Console targets → whatever is certified

Console platform holders certify specific Unity versions for their SDKs, and certification lags Unity’s releases. The newest LTS may not be approved for your dev kit yet. Ask your platform contact or publisher which versions are cleared before you start, because switching editor versions after certification testing has begun is expensive.

Platform-Specific Gotchas

• Mobile: IL2CPP with ARM64 is mandatory on both stores, and the minimum target Android API level rises every year. A two-year-old editor may simply not be able to produce a build the store accepts. This is the strongest argument for staying on a current LTS.
• WebGL: Unity 6 made real improvements here — smaller builds, better WebAssembly threading — so it’s worth upgrading for WebGL even if nothing else forces you to. Treat WebGPU as experimental and ship on WebGL 2. Our WebGL optimization guide covers the build-size side.
• VR / AR: Use the OpenXR plugin, which tracks the current LTS most closely. Quest devices also impose their own minimum Android API level.
• Desktop: Fewest constraints. Apple Silicon is natively supported; HDRP is a real option. The main risk is an Asset Store package that hasn’t updated — check your critical dependencies against the target version before upgrading an existing project.

Upgrading an Existing Project Safely

When you do move versions, treat it like any other risky change:

1. Commit everything and tag the version in version control first. Unity’s upgrade rewrites serialized files; you want a clean point to return to.
2. Read the upgrade guide for the target version. Unity documents the breaking changes per release, and render-pipeline upgrades (Built-in → URP, or URP major versions) are where the real work hides.
3. Upgrade one LTS at a time if you’re more than one generation behind. Jumping from 2021 to Unity 6 in a single step compounds every breaking change at once.
4. Update packages after the editor, then fix compile errors, then fix warnings, then run every scene. Don’t skip the warnings — deprecated APIs become removed APIs in the next version.
5. Re-check Project Settings: upgrades occasionally reset or rename settings, especially around stripping, graphics APIs, and input.
6. Profile again. Performance characteristics change between versions; your performance budget may need re-verifying on device.

FAQ

The Short Version

New project: newest LTS, highest patch. Existing project: stay until a store, SDK, or support deadline gives you a reason. Consoles: whatever is certified. Update releases: only when a feature demands it and you can afford to keep moving. If you’re still not sure which stream applies to your platform, the checker walks through it in thirty seconds.