MCOvsZenith
Generated from the two spec rows. Green marks the better value where a spec has a clear direction. Everything else is just different.
MCO
MCO · Agent harness
OSS
Panel
5.91 spec wins
- Reliability
- 5.8
- Usefulness
- 6.3
- Cost
- 5.8
- Longevity
- 5.7
“It ships an mco doctor command, mostly to tell you how many coding agents you have accidentally installed.”
Zenith
Intelligent Internet · Agent harness
OSSMCP
Panel
5.91 spec wins
- Reliability
- 5.7
- Usefulness
- 6.3
- Cost
- 6.2
- Longevity
- 5.5
“The research finding is that long agent runs fail by stopping too early, which makes them the most relatable thing in the stack.”
Spec by spec
| Spec | MCO | Zenith |
|---|---|---|
| Architecture | ||
| Category | Agent harness | Agent harness |
| Runs | local | local |
| Platforms | macos, linux | macos, linux |
| Context window | not documented | not documented |
| Protocols | ||
| MCP client | No | Yes |
| MCP server | No | No |
| Capabilities | ||
| Runs terminal commands | Yes | Yes |
| Multi-file edits | YesMCO can run coding tasks as well as read-only reviews, but the edits are made by the agent it dispatches to. | Yes |
| Git operations | No | No |
| Browser control | No | No |
| Sandboxed execution | No | No |
| Multi-agent orchestration | Yes | YesThe orchestrator dynamically allocates worker and tester sessions and can register reusable skills between turns. |
| Headless / CI mode | YesThe README lists CI checks among the intended workflows and the CLI emits JSON. | Yes |
| Models | ||
| Backbone | Claude Code, Codex, Cursor, GitHub Copilot, Pi, OpenClaw | via managed agents (Claude Code, Codex, Hermes) |
| Bring your own model | Yes | Yes |
| Local models | No | No |
| Cost | ||
| Pricing model | byok | byok |
| Starts at | $0/mo | $0/mo |
| Free tier | Yes | Yes |
| Bring your own key | Yes | Yes |
| Openness | ||
| Open source | Yes | Yes |
| License | MIT | Apache-2.0 |
| GitHub stars | 531 | 320 |
Which one would each critic pick
| Critic | MCO | Zenith | Pick |
|---|---|---|---|
| El Juez | — | — | not enough reviews |
| El Amigo | 6.3 | 6.3 | no preference |
| El Crítico | 5.5 | 5.8 | Zenith — The orchestrator decides each turn whether to spawn more workers and testers, so the depth of a run is set by the same component that judges whether the work is finished. |
| El Profesor | 6.0 | 6.0 | no preference |
| La Inversora | 6.0 | 5.3 | MCO — Every run monetises somebody else's subscription and MCO never touches an invoice, which is a popular utility rather than a business. |
| La Jefa | 5.0 | 4.8 | MCO — Sixty engineers running this means sixty engineers each holding several vendor subscriptions, and macOS and Linux only excludes my Windows contingent. |
| El Hacker | 6.8 | 7.5 | Zenith — Apache-2.0, launched with uv run, and it orchestrates over MCP and ACP, so the sessions it drives are the agents I already installed rather than a captive runtime. |
Picks are derived from each critic's own scores. Humans vote on matchups on the duels page.