cmuxvsGitLab Duo
Generated from the two spec rows. Green marks the better value where a spec has a clear direction. Everything else is just different.
cmux
Manaflow · Agent harness
OSS
Panel
6.63 spec wins
- Reliability
- 6.3
- Usefulness
- 6.5
- Cost
- 7.5
- Longevity
- 6.0
“A terminal for coordinating many agents on exactly one operating system, so the agent wars are settled by what laptop you were issued.”
GitLab Duo
GitLab · Agent harness
MCP
Panel
6.87 spec wins
- Reliability
- 6.7
- Usefulness
- 6.5
- Cost
- 5.8
- Longevity
- 8.0
“It has shipped a Security Analyst agent, so the robot now files the vulnerability the other robot wrote.”
Spec by spec
| Spec | cmux | GitLab Duo |
|---|---|---|
| Architecture | ||
| Category | Agent harness | Agent harness |
| Runs | local | local, cloud |
| Platforms | macos | macos, linux, windows, web |
| Context window | not documented | not documented |
| Protocols | ||
| MCP client | No | Yes |
| MCP server | No | Yes |
| Capabilities | ||
| Runs terminal commands | Yes | Yes |
| Multi-file edits | No | Yes |
| Git operations | NoThe sidebar displays branch and pull request status but cmux performs no git operations itself. | Yes |
| Browser control | Yes | No |
| Sandboxed execution | No | No |
| Multi-agent orchestration | YesNative panes for Claude Code Teams and oh-my-opencode orchestration; cmux runs and watches the agents rather than running an agent loop of its own. | Yes |
| Headless / CI mode | No | YesFlows started from the GitLab UI execute in GitLab CI/CD runners. |
| Models | ||
| Backbone | via managed agents (Claude Code, Codex, OpenCode, Gemini CLI, Amp, Aider) | Anthropic Claude |
| Bring your own model | No | YesOnly through the GitLab Duo Self-Hosted deployment on Self-Managed instances. |
| Local models | No | YesGitLab Self-Managed instances can run Duo against self-hosted models through a self-installed AI Gateway; GitLab.com uses GitLab-selected models. |
| Cost | ||
| Pricing model | free | seat |
| Starts at | $0/mo | n/a |
| Free tier | Yes | No |
| Bring your own key | No | No |
| Openness | ||
| Open source | Yes | No |
| License | GPL-3.0-or-later | proprietary |
| GitHub stars | 27,557 | n/a |
Which one would each critic pick
| Critic | cmux | GitLab Duo | Pick |
|---|---|---|---|
| El Juez | — | — | not enough reviews |
| El Amigo | 7.3 | 7.0 | cmux — Pick it if you run several agents on a Mac and your terminal has become a graveyard of tabs; pick Warp if you want the terminal itself to be the agent. |
| El Crítico | 6.5 | 6.5 | no preference |
| El Profesor | 6.8 | 7.0 | GitLab Duo — Composition is the design claim: named agents combined into foundational or custom flows, with no published evaluation of whether composition improves the outcome. |
| La Inversora | 6.0 | 8.0 | GitLab Duo — Bundling the entry tier into Premium and Ultimate is an attach-rate play, not a product launch: the AI is defending the subscription, not selling itself. |
| La Jefa | 5.5 | 7.3 | GitLab Duo — The add-on seats are quoted rather than listed, and Agent Platform usage draws down purchased Credits, so sixty developers is one number I cannot compute in advance. |
| El Hacker | 7.5 | 4.8 | cmux — The LICENSE header says GPL-3.0-or-later while GitHub reports NOASSERTION, and every action is drivable from a CLI and a Unix socket. |
Picks are derived from each critic's own scores. Humans vote on matchups on the duels page.