Arbitrum has shipped a network upgrade whose headline feature is a number: 96 kilobytes.
The ArbOS 61 release, named Elara, quadruples the size limit for Stylus contracts on Arbitrum One and Nova. Stylus is the network''s parallel execution environment that lets developers write onchain programs in Rust, C and C++ rather than Solidity, compiling them to WebAssembly. The change was approved by token holders in early August and rolled out days later.
The constraint mattered more than it sounds. Ethereum''s inherited contract size ceiling forces complex applications into fragmented sets of interacting contracts, a pattern that has produced some of the sector''s worst security incidents. A larger ceiling allows programs that are computationally heavy — risk engines, matching logic, cryptographic verification — to exist as a single auditable unit.
Arbitrum remains the largest layer-2 network by value locked, with roughly $17 billion in DeFi assets, but its lead has narrowed as rivals compete on transaction volume and user counts rather than liquidity.
Courting developers who have never written Solidity is the strategic bet. The pool of engineers fluent in Rust is orders of magnitude larger than the pool fluent in Ethereum''s native language, and every layer-2 network is fishing in the same small pond today.
Whether they arrive is a separate matter. Developer tooling, not code-size limits, has been the binding constraint for most of Ethereum''s history.