--- title: "Helicon vs OpenCode for Muse Code subscribers" url: https://helicon.sh/compare/opencode description: "OpenCode is an open-source terminal agent with its own provider routing. Helicon is a GUI for Meta's Muse Code CLI that reuses the subscription you already pay for." updated: 2026-09-19 site: Helicon --- # Helicon vs OpenCode OpenCode is an open-source agent harness that you point at providers, usually with its own API billing. Helicon is not a harness at all: it is a desktop and web interface for Meta's Muse Code CLI, so the agent, the models and the subscription are the ones you already have, with no second route to pay for. ## At a glance | | Helicon | OpenCode | | --- | --- | --- | | What it is | GUI client for the Muse Code CLI | Terminal agent harness | | Agent | Muse Code | Its own loop over chosen providers | | Billing | Existing Muse Code subscription | Usually your own API keys | | Interface | Desktop app and web UI | Terminal | | Session list across repos | Yes | Per invocation | | License | MIT | Open source | | Approvals | Muse Code's own, surfaced one to one | Harness defined | _Helicon compared with OpenCode._ ## What each one is OpenCode is a good answer to a different question: how do I get an open agent loop that I control end to end, across whichever providers I like. That control comes with provider configuration and, for most people, pay as you go API billing. Helicon does not try to own the loop. Muse Code owns the loop. Helicon is the window: sessions grouped by working directory, resume, inline diffs, an approval queue, and what each thread would have cost at published rates. ## Where they actually differ ### Subscription reuse is the point A recurring complaint from people who buy a coding subscription is finding that a favourite harness routes through its own API metering instead. Helicon uses your `muse login` and nothing else, so the plan you bought is the plan that pays. ### Terminal versus window OpenCode is a terminal experience. Helicon exists because the terminal has no persistent history UI, no cross project triage and no cost surface. ### Protocol native Helicon speaks the Muse Code Session Protocol through Meta's MIT SDK rather than scraping a TUI, so sessions started from the terminal are discovered and resumable. ## Choose OpenCode if - You want to choose and mix providers yourself. - You are happy in a terminal and want maximum control over the agent loop. - You need an agent where no vendor CLI is involved. ## Choose Helicon if - Your subscription is Muse Code and you want it to be the thing that pays. - You want a GUI with history, diffs, approvals and cost. - You want sessions started in the muse TUI to be visible and resumable. ## Can you use both? They are not exclusive, but they are not complementary either: one is a harness, the other is a client for a different harness. Pick by whether your Muse Code plan should be doing the work. ## Frequently asked questions ### Can Helicon route to other providers? No. Helicon drives the muse CLI. Whatever models Muse Code offers on your plan are the models you get. ### Is Helicon open source too? Yes, MIT licensed, with the desktop app, web app, daemon and this site in one public repository. ### Do I need API keys for Helicon? No. Authentication is your own `muse login`, held by the CLI. Helicon never stores credentials. ## Related - [The muse terminal](https://helicon.sh/compare/muse-code-terminal): How a Muse Code GUI differs from the muse CLI terminal interface: session history, inline diffs, approvals and cost, side by side with what the TUI already does well. - [VS Code extensions](https://helicon.sh/compare/vs-code-extension): A standalone Muse Code desktop app compared with running the muse CLI inside VS Code: where an editor panel wins, where a separate session home wins, and how to run both. - [Zed with ACP](https://helicon.sh/compare/zed-acp): Running Muse Code inside Zed through an Agent Client Protocol bridge, compared with a standalone Muse Code desktop app. Editor native versus session native. - [JetBrains IDEs](https://helicon.sh/compare/jetbrains-acp): Muse Code inside IntelliJ, PyCharm, GoLand or WebStorm through an Agent Client Protocol plugin, compared with a standalone Muse Code desktop app. - [Claude Code desktop](https://helicon.sh/compare/claude-code-desktop): Two desktop apps for two different coding agents. What Helicon borrows from the Claude Code desktop experience, and what changes because the agent underneath is Muse Code. - [Codex app](https://helicon.sh/compare/codex-app): How a Muse Code desktop client compares with OpenAI's Codex app: same category, different agent, different billing, different openness. --- Helicon is a free, MIT licensed, unofficial community client for Meta's Muse Code CLI. Not made, sponsored or endorsed by Meta. Source: https://helicon.sh/. Machine readable index: https://helicon.sh/llms.txt