MercuryvsOpenFox
Generated from the two spec rows. Green marks the better value where a spec has a clear direction. Everything else is just different.
Mercury
CosmicStack Labs · Terminal agent
#157OSS
Panel
5.93 spec wins
- Reliability
- 5.2
- Usefulness
- 5.8
- Cost
- 6.7
- Longevity
- 6.0
“Executes shell commands and file operations without a sandbox, relying on user approval and a command blocklist for safety.”
OpenFox
co-l · Terminal agent
#208OSS
Panel
6.01 spec wins
- Reliability
- 5.7
- Usefulness
- 5.8
- Cost
- 7.5
- Longevity
- 4.8
“It describes your images for you because the local model cannot see them, which is the most polite workaround on this board.”
Spec by spec
| Spec | Mercury | OpenFox |
|---|---|---|
| Architecture | ||
| Category | Terminal agent | Terminal agent |
| Runs | local | local |
| Platforms | macos, linux, windows, web | macos, linux, windows, web |
| Context window | not documented | not documented |
| Protocols | ||
| MCP client | No | No |
| MCP server | No | No |
| Capabilities | ||
| Runs terminal commands | Yes | Yes |
| Multi-file edits | Yes | Yes |
| Git operations | Yes | No |
| Browser control | Yes | No |
| Sandboxed execution | No | No |
| Multi-agent orchestration | Yes | YesWorkflows can dispatch sub-agents as isolated steps within a pipeline. |
| Headless / CI mode | No | No |
| Models | ||
| Backbone | vLLM, SGLang, Ollama, llama.cpp, any OpenAI-compatible local backend | |
| Bring your own model | Yes | Yes |
| Local models | No | Yes |
| Cost | ||
| Pricing model | free | free |
| Starts at | n/a | $0/mo |
| Free tier | Yes | Yes |
| Bring your own key | Yes | Yes |
| Openness | ||
| Open source | Yes | Yes |
| License | MIT | unspecified |
| GitHub stars | 3,169 | 339 |
Which one would each critic pick
| Critic | Mercury | OpenFox | Pick |
|---|---|---|---|
| El Juez | — | — | not enough reviews |
| El Amigo | 7.8 | 6.5 | Mercury — Mercury is a solid choice for a persistent, multi-channel agent if you value safety and control over autonomous execution. |
| El Crítico | 6.3 | 5.8 | Mercury — It runs commands on your host without a sandbox. Use the approval flow and do not walk away. |
| El Profesor | 5.3 | 6.3 | OpenFox — Language-server diagnostics are consumed during generation, which supplies a verification signal that is independent of the model rather than another opinion from it. |
| La Inversora | 5.5 | 5.5 | no preference |
| La Jefa | 4.3 | 4.8 | OpenFox — Free at sixty seats, but the real bill is the inference hardware, and every machine needs Node 24 or newer before anyone can start. |
| El Hacker | 6.5 | 7.0 | OpenFox — It detects vLLM, SGLang, Ollama or llama.cpp and configures itself, and provider plugins add transports without touching the core, but the repository carries no licence file. |
Picks are derived from each critic's own scores. Humans vote on matchups on the duels page.