Yes, Alpenglow is live on Solana mainnet. Anza posted "Alpenglow is live on mainnet-beta" on Oct 21, 2026 at 13:54 UTC and Solana confirmed at 13:59 UTC with "Alpenglow is now live on Solana mainnet."

Reported change is finality from about 12.8 seconds under TowerBFT to about 150ms with the new Votor consensus, described as Solana's biggest consensus upgrade and built by Anza.

That 150ms figure remains the stated protocol target from Solana Foundation, not a confirmed post-activation measurement. Execution (SVM) is unchanged so most apps need no migration.

Rotor block propagation is a later phase and not part of this activation.