CodervsGitLab Duo
Generated from the two spec rows. Green marks the better value where a spec has a clear direction. Everything else is just different.
Coder
Coder Technologies · Agent harness
OSSMCP
Panel
7.64 spec wins
- Reliability
- 7.8
- Usefulness
- 7.3
- Cost
- 7.2
- Longevity
- 8.2
“It sells you the room your agent works in, which is the oldest business in software wearing new vocabulary.”
GitLab Duo
GitLab · Agent harness
MCP
Panel
6.80 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 | Coder | GitLab Duo |
|---|---|---|
| Architecture | ||
| Category | Agent harness | Agent harness |
| Runs | cloud, sandbox | local, cloud |
| Platforms | macos, linux, windows, web | macos, linux, windows, web |
| Context window | not documented | not documented |
| Protocols | ||
| MCP client | Yes | Yes |
| MCP server | Yes | Yes |
| Capabilities | ||
| Runs terminal commands | Yes | Yes |
| Multi-file edits | Yes | Yes |
| Git operations | Yes | Yes |
| Browser control | No | No |
| Sandboxed execution | Yes | No |
| Multi-agent orchestration | Yes | Yes |
| Headless / CI mode | Yes | YesFlows started from the GitLab UI execute in GitLab CI/CD runners. |
| Models | ||
| Backbone | any | Anthropic Claude |
| Bring your own model | YesCoder runs whichever agent and model the team chooses; the AI Governance gateway brokers the LLM calls rather than supplying a model. | YesOnly through the GitLab Duo Self-Hosted deployment on Self-Managed instances. |
| Local models | YesThe whole platform is self-hosted, so an on-premises or in-VPC model endpoint can be used through the AI Governance gateway. | 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 | mixed | seat |
| Starts at | $0/mo | n/a |
| Free tier | Yes | No |
| Bring your own key | Yes | No |
| Openness | ||
| Open source | Yes | No |
| License | AGPL-3.0 | proprietary |
| GitHub stars | 16,807 | n/a |
Which one would each critic pick
| Critic | Coder | GitLab Duo | Pick |
|---|---|---|---|
| El Juez | — | — | not enough reviews |
| El Amigo | 7.5 | 7.0 | Coder — Pick it when agents must not run on laptops; pick Ona if you want the same isolation without operating the platform that provides it. |
| El Crítico | 6.8 | 6.5 | Coder — Adopting this means running a workspace platform, a gateway and the agents inside them, which is infrastructure staffing before it is a coding tool. |
| El Profesor | 7.5 | 7.0 | Coder — Observation happens at the protocol boundary rather than inside the agent, which is why it works for agents the platform did not write. |
| La Inversora | 8.0 | 8.0 | no preference |
| La Jefa | 7.3 | 7.3 | no preference |
| El Hacker | 8.8 | 4.8 | Coder — AGPL-3.0, a one-line install script, its own protocol server plus an API, and every workspace runs on hardware I racked with a model endpoint I chose. |
Picks are derived from each critic's own scores. Humans vote on matchups on the duels page.