Input Output (IOG), the firm behind Cardano's core development, has moved the consensus machinery of its Leios scaling design onto the main development branch, as reported by COINOTAG on November 9, 2026. The integration forms part of preparations for a targeted Leios mainnet deployment in December 2026.

The same development cycle delivered a notable performance gain on the Leios prototype: building a certification block now takes milliseconds, down from a maximum of 0.9 seconds previously required. Block-construction speed is one of the performance benchmarks the research program has published, and for a design whose stated purpose is raising throughput, that figure offers a directly measurable indicator of prototype progress.

Consensus Components Reach the Main Development Branch

By bringing the Leios consensus machinery onto the main development branch, Input Output has placed the scaling design within the codebase that underpins Cardano's live network, ahead of the December 2026 mainnet target stated in the update. Integration into a main development branch is the engineering step that moves protocol research out of standalone prototypes and onto the path from which production network software is built, so subsequent changes to the Leios code now occur in the same codebase that underpins the network today.

Background: Cardano and the Leios Research Program

Cardano (ADA) is a proof-of-stake blockchain platform whose core protocol, Ouroboros, has been developed through an academic, peer-reviewed research process. Input Output — co-founded by Ethereum co-founder Charles Hoskinson — leads the platform's core engineering, working alongside ecosystem bodies such as the Cardano Foundation and Emurgo.

Leios is Input Output's research initiative aimed at substantially increasing Cardano's transaction throughput while preserving the security and decentralization properties of Ouroboros. Transaction throughput — the volume of activity a network can process — is a core capacity measure for blockchain platforms, and raising it without eroding decentralization has been a longstanding engineering challenge across the industry. The effort has progressed through publicly shared prototype software and performance benchmarks, with the latest cycle demonstrating millisecond-scale certification block construction alongside the integration of consensus components into the main development branch. With a December 2026 mainnet target now attached to the program, further benchmark publications and integration milestones shared through Input Output's public development updates are the concrete markers against which progress toward that date can be tracked.

This content was first published on COINOTAG: https://en.coinotag.com/input-output-leios-consensus-features-cardano-dev-branch