Three milestones in Lambda’s Ethereum work over the past months: ethrex passed its first year and joined a core developer interop, ethlambda was introduced as a Lean Consensus client, and lambdaworks published its 2026 roadmap.
ethrex
ethrex began as a three-person exploratory project and now has a forty-person team.1 It functions as both a full L1 execution client and an L2 ZK-rollup client, allowing a single command to deploy an EVM-equivalent based rollup. ethrex was the first stack to incorporate based rollups from day one and was admitted to Ethereum’s Hive testing suite.1 In early 2026, ethrex participated in the Soldøgn Interop above the Arctic Circle alongside other client teams working on the Glamsterdam upgrade.2
ethlambda
On January 20, 2026, Lambda introduced ethlambda, a Rust consensus client for Ethereum’s Lean Consensus track.3 Lean Consensus targets three-slot finality, post-quantum hash-based signatures, lower staking minimums (1 ETH), SNARKified state transitions, and Gossipsub v2.0 networking with four-second slots. ethlambda is under five thousand lines of code and runs full devnet-1 consensus. The post-quantum devnet sequence ran through pq-devnet-0 in September 2025, pq-devnet-1 with leanSig in November 2025, and pq-devnet-2 with full signature aggregation targeted for January 2026.3 By April 2026, the team reported a threefold speedup in the signature aggregation work that the leanConsensus devnet depends on.4
lambdaworks
On February 3, 2026, lambdaworks published its 2026 roadmap.5 Priorities include completion of STARK with logUp/FRI, Plonk with lookup tables, Circle STARKs, GKR logUp, GPU acceleration across CUDA, Metal, and WebGPU, the KoalaBear field, and post-quantum signatures including Lean Ethereum’s XMSS. The roadmap frames lambdaworks around two operational regimes for Lean Ethereum: Fort Mode for nation-state-grade resilience, and Beast Mode for one gigagas per second on L1 and one teragas per second on L2.5 https://blog.lambdaclass.com/celebrating-a-year-of-ethrex/ ↩ ↩2 https://blog.lambdaclass.com/a-week-above-the-arctic-circle-ethrex-at-soldogn-interop/ ↩ https://blog.lambdaclass.com/introducing-ethlambda-a-lean-consensus-client-for-ethereums-next-era/ ↩ ↩2 https://blog.lambdaclass.com/ethlambda-how-we-got-a-3x-speedup-in-signature-aggregation/ ↩ https://blog.lambdaclass.com/updated-roadmap-and-priorities-for-lambdaworks-for-2026/ ↩ ↩2