CosinevsFuXi
Generated from the two spec rows. Green marks the better value where a spec has a clear direction. Everything else is just different.
Cosine
Cosine AI · Terminal agent
#100MCP
Panel
5.81 spec wins
- Reliability
- 5.7
- Usefulness
- 6.8
- Cost
- 5.2
- Longevity
- 5.5
“It used to be called Genie and is now named after a function that always comes back around, which is a bold choice for a startup.”
FuXi
FUXI · Terminal agent
#90MCP
Panel
5.85 spec wins
- Reliability
- 5.0
- Usefulness
- 6.5
- Cost
- 7.3
- Longevity
- 4.3
“More than fifty built-in tools in one binary, which is either thoroughness or the longest permission prompt in this category.”
Spec by spec
| Spec | Cosine | FuXi |
|---|---|---|
| Architecture | ||
| Category | Terminal agent | Terminal agent |
| Runs | local, cloud, sandbox | local |
| Platforms | macos, linux, windows, web | macos, linux, windows |
| Context window | not documented | not documented |
| Protocols | ||
| MCP client | Yes | Yes |
| MCP server | No | Yes |
| Capabilities | ||
| Runs terminal commands | Yes | Yes |
| Multi-file edits | Yes | Yes |
| Git operations | Yes | Yes/commit and /review create commits, review code and open pull requests. |
| Browser control | YesBrowser tools drive Chrome or Chromium over the DevTools Protocol, which requires launching the browser with --remote-debugging-port and setting cdp_url in ~/.cosine/config.toml. | Yes |
| Sandboxed execution | YesRemote environments are isolated containers built from a Dockerfile; local runs are not sandboxed. | No |
| Multi-agent orchestration | Yes | Yes |
| Headless / CI mode | No | Yes`fuxi setup-token` is documented specifically for headless and CI use. |
| Models | ||
| Backbone | Lumen Scout, Lumen Outpost, GPT-5.5, Claude Sonnet 4.6, Claude Opus 4.7, Gemini 3.1 Pro, DeepSeek, Kimi K2.6, MiniMax M2.7, Qwen | any OpenAI-compatible provider, Anthropic, Gemini, Amazon Bedrock, Google Vertex |
| Bring your own model | YesLimited to ChatGPT and Claude models accessed through your own provider account. | Yes |
| Local models | No | YesA custom base_url is documented through config, the FUXI_BASE_URL environment variable and the -b/--base-url flag, which covers a locally hosted OpenAI-compatible server. |
| Cost | ||
| Pricing model | subscription | byok |
| Starts at | $19/mo | $0/mo |
| Free tier | No | Yes |
| Bring your own key | YesYou can sign in with your own ChatGPT or Claude Max subscription, which routes billing to that provider instead of consuming Cosine credits. | Yes |
| Openness | ||
| Open source | No | No |
| License | proprietary | proprietary |
| GitHub stars | n/a | 3,350 |
Which one would each critic pick
| Critic | Cosine | FuXi | Pick |
|---|---|---|---|
| El Juez | — | — | not enough reviews |
| El Amigo | 6.3 | 6.5 | FuXi — Pick it if you want one downloaded binary and no runtime to install; pick OpenCode when you would rather your terminal agent be something you can read. |
| El Crítico | 6.0 | 5.3 | Cosine — The same agent has two different safety models: remote environments are isolated containers, and local runs are not isolated at all. |
| El Profesor | 5.5 | 6.3 | FuXi — Classifying shell commands by parsing them into a syntax tree is the correct method; pattern matching on command strings is what everyone else does and it is defeated by quoting. |
| La Inversora | 6.0 | 5.3 | Cosine — Owning the Lumen models is the only durable asset here, and add-on credits sold at four to six dollars a million is where the margin is decided. |
| La Jefa | 5.3 | 5.0 | Cosine — Sixty engineers on the entry plan is $1,140 a month before a single credit is topped up, and there is no headless mode to put any of it in a pipeline. |
| El Hacker | 5.8 | 6.5 | FuXi — Closed source, but FUXI_BASE_URL or the -b flag points it at any OpenAI-compatible endpoint, which includes the server running on my own machine. |
Picks are derived from each critic's own scores. Humans vote on matchups on the duels page.