March 2026 (openai/codex). Key deliverable: Bazel Toolchain Upgrade for Rust and LLVM to latest toolchain versions, improving build performance and compatibility across environments. This included bumping dependencies (rules_rs and LLVM) to align with the new toolchains (commit 2d8c1575b8ba94179923348065062dc70f09deab). No major bugs reported in the provided data. Impact: faster CI/builds, reduced maintenance burden, and a stronger foundation for future Rust/LLVM work. Technologies demonstrated: Bazel, Rust toolchains, LLVM, rules_rs, dependency management, and tooling modernization.

February 2026 saw cross-repo Bazel improvements that advance Windows readiness and Bazel correctness. Windows build rulesets and toolchains were upgraded to enable Windows compatibility, reduce patches, and improve platform definitions and environment handling, while a fix to Bazel dependency categorization for first-party proc_macro crates ensured tests and binaries receive proper dependencies. These changes enhance build reliability, shorten iteration cycles, and improve CI/frequency of releases across zed-industries/codex and openai/codex.

Month: 2026-01 — Focused on delivering a modernized, faster, and more reliable CI/CD and build system for Codex, with cross‑platform support and improved performance. Implemented Bazel-based CI/CD, BuildBuddy remote caching/execution, and a Bazel-centric GitHub Actions workflow to accelerate PR validation and macOS/Linux test runs while preparing for Windows builds. Upgraded core toolchains and optimized dependencies to improve reliability and reduce CI times.