Will iOS 26 be available for iPhone 15?

iOS 26 will be released to the public this fall. It is currently in developer beta. You are advised to NEVER install beta software on your primary device as the entire point of testing software is to determine what doesn't work. Wait until the fall. And yes, iPhone 15 will get iOS 26 when it is officially released.

Are you a registered developer? If you are not, you're not eligible for the developer beta.

As a general rule, even once the public beta is released, unless you have a spare phone, you shouldn't try running the beta.

It will be when the final version is released, and is for people in Apple's testing programs.

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