Watch releases
Detect upstream CLI updates and keep install evidence before benchmark work is queued.
Open Version Manager
Track releases. Pin versions. Catch changes.
Born from a real failure: Codex 0.144.0 installed cleanly, passed every version check — and couldn't execute a single command. So OVM gates coding agents on real tool use and install-verifies non-agent tools before a release reaches you.
get ovm
github
curl -fsSL https://ovm.sh/install | sh
Recommended for most macOS and Linux installs.
then, a first session
ovm install claude latest # install, don't switch
ovm use claude <version> # pin the active one
ovm list claude # installed + current
ovm update # update when you sayHow fast to usable
Startup is the moment the TUI accepts input — the warm average across launches.
Codex starts up markedly faster — its Rust binary reaches an interactive prompt well ahead of Claude Code.
combined · lower is faster
17 versions · generated 2026-06-29
Pin exact builds
Install and switch Codex, Claude Code, and Pi versions without losing the current working setup.
Measure locally
Run native macOS clean-room startup tests and real-home MCP/auth response checks. Benchmarks cover Claude Code and Codex today; Pi is managed without performance measurements.
Publish evidence
Turn benchmark history and release watcher output into static research artifacts.
OVM releases
release notesLive index loads here — releases are always on GitHub.
Evidence
Every run leaves a record: what was measured, on which machine, and what the gate decided. Newest first.
benchmark report
The unified startup, response, and model report for every verified release.