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Yes. A single OpenCode server is designed to serve multiple clients, including a terminal, web browser and SDK application. The web and attached terminal are documented to share sessions and state. That does not guarantee conflict-free simultaneous prompts or file edits, because OpenCode’s documentation does not specify locking or race-resolution behavior.
What “multiple clients” means in OpenCode
OpenCode separates the user interface from the process that owns the server-side state. The terminal interface (TUI) acts as a client that talks to a server. A standalone opencode serve process exposes an HTTP API and an OpenAPI specification, allowing more than one client to connect to the same backend.
In practical terms, you can run a browser interface, attach a terminal, or write a program that connects to the same server URL. Each client is a separate front end, but the sessions and other resources belong to the server they reach. OpenCode’s server documentation describes this architecture as supporting multiple clients and programmatic interaction.
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What is actually shared?
When clients connect to one server, they can work with that server’s session resources rather than creating an isolated copy in each interface. The documented API includes operations to list and create sessions, retrieve session details, fork sessions, delete sessions and send messages.
- Sessions: Clients can access the sessions managed by the server, subject to the permissions and authentication configured for that server.
- Session state: The web documentation explicitly says that a web interface and an attached terminal can be used simultaneously while sharing sessions and state.
- Server operations: API clients can perform documented session operations through the running backend.
- Project files: A shared session does not by itself establish a file-locking or merge system. Two clients can still issue actions that affect the same working tree.
There is no indication in these documents that separate OpenCode servers automatically synchronize sessions. If one client connects to server A and another connects to an unrelated server B, treat them as separate state stores unless your own deployment provides a synchronization layer.
Connection methods by client type
| Client | Typical connection | What the documentation establishes | Important qualification |
|---|---|---|---|
| Terminal attached to a server | opencode attach <url> |
The CLI can attach a terminal to a running backend. | Use the command and authentication flags supported by your installed release. |
| Web interface | Start a web server, then connect a browser | The web interface and attached terminal can run at the same time and share sessions and state. | Browser access requires the server to be reachable and correctly configured for authentication and CORS. |
| SDK or custom program | createOpencodeClient({ baseUrl: "http://localhost:4096" }) |
An SDK client can point to an already-running server URL; types can be generated from the OpenAPI specification. | Your program must use the API behavior exposed by the server version you run. |
| Current v2 connection surface | opencode --server <url> or a pairing flow |
The v2 web documentation describes server URLs, opencode pair, shared service operation and SSH forwarding. |
The v2 API page labels its selected HTTP API surface experimental; verify commands against your installed build. |
Use a terminal and browser at the same time
The standard web documentation provides the clearest supported scenario for simultaneous clients. Start a web server, then attach a terminal to that same address.
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- Start the web server. The documented example is
opencode web --port 4096. - Open the web interface. Use the address displayed by the command, normally the local server on port 4096.
- Attach the terminal. Run
opencode attach http://localhost:4096. - Check the session list. Select or create a session in one interface, then confirm that the other interface sees the same server-side session.
- Keep actions coordinated. Shared visibility is documented; simultaneous prompts or edits are not described as conflict-safe.
This flow is different from starting two independent local instances. Both interfaces must point to the same running backend if you expect them to see the same sessions.
Run a standalone server and attach clients
The server documentation describes opencode serve as a standalone HTTP server. Its documented default is port 4096 on hostname 127.0.0.1. You can set an explicit hostname and port so every client uses predictable connection details.
- Start the backend: run
opencode serve, or supply the documented--hostnameand--portoptions when you need a specific bind address. - Record the URL: for a default local setup, this is typically
http://127.0.0.1:4096. - Attach a terminal: use
opencode attach <url>with the server URL. - Connect other clients: point the web interface or SDK
baseUrlat that same URL. - Authenticate when required: provide the username and password options or environment variables supported by your release.
Do not assume that running opencode serve from a terminal that already has a TUI automatically attaches to that existing process. The older server guide describes serve as starting a new server.
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Connect an SDK or automation client
The SDK guide shows a client created with a server URL:
import { createOpencodeClient } from "opencode-sdk"
const client = createOpencodeClient({
baseUrl: "http://localhost:4096"
})The exact package import and generated types depend on the SDK setup documented for your release, but the key design is stable: the SDK connects to an existing server instead of launching a second state store. OpenCode also documents generating SDK types from the server’s OpenAPI specification. This is useful when a script needs to list sessions, create a session, read details, fork or delete one, or send a message through the API.
For production automation, keep the SDK pointed at a controlled server URL, handle authentication explicitly, and account for failures such as an unavailable server, an expired credential or a session being deleted by another client.
Version differences: standard commands versus v2 flows
OpenCode’s published documentation currently describes more than one command and access surface. The standard server, web and CLI pages use serve, web and attach. A separate v2 web page describes connecting with opencode --server <url>, a shared service flow and opencode pair.
These are not interchangeable names you should mix casually. Before copying a command, check the help output and documentation that match the binary installed on your machine. The v2 API documentation also calls its selected HTTP API surface experimental, so scripts built against it may require adjustment as the release changes.
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| Documentation surface | Connection vocabulary | Use it when |
|---|---|---|
| Standard server/web/CLI pages | opencode serve, opencode web, opencode attach |
Your installed release exposes those commands and environment variables. |
| v2 web page | opencode --server, opencode pair, shared service, SSH forwarding |
Your release documents the v2 flow and its pairing/session behavior. |
Protect a server before sharing it
A server bound only to 127.0.0.1 is local to the host unless you use forwarding. Once you bind it to a network interface, treat it as a service that needs authentication and careful exposure.
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Standard server and web authentication
The standard documentation uses HTTP Basic authentication. Set OPENCODE_SERVER_PASSWORD before starting the server. The default username is opencode; set OPENCODE_SERVER_USERNAME if you need a different one. The CLI documentation also lists username and password flags for attaching.
Binding and CORS
The web documentation says the default bind is 127.0.0.1. To make the service reachable from other machines, configure the server to bind to an appropriate network address, commonly 0.0.0.0 when the deployment requires all interfaces, and configure allowed browser origins for CORS.
- CORS controls which browser origins may make requests.
- Authentication controls who may use the service.
- A permitted CORS origin is not a substitute for a password.
- Do not expose a network-accessible server without the authentication mechanism documented for your release.
v2 pairing and browser sessions
The v2 web documentation describes pairing links that work once and expire after five minutes. It describes browser or app sessions lasting 30 days and says changing the server password invalidates those sessions. Treat those durations as v2-specific behavior and verify them against the version you operate.
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If the server listens only on localhost on a remote machine, SSH local port forwarding lets your local client reach it without binding the OpenCode process to a public interface. The general pattern is to forward a local port to the remote host’s loopback port, then connect your browser, terminal or SDK to the local endpoint.
Use the exact SSH syntax and host details appropriate to your environment, and keep authentication enabled on the OpenCode server. The v2 web documentation also describes a remote-access option and a confirmation prompt associated with exposing the service to the internet. Never treat that confirmation as a reason to skip a password, firewall rule or encrypted transport.
What happens when two clients use one session?
The documented answer stops at shared sessions and state. OpenCode does not specify how it resolves two prompts submitted at nearly the same time, how it orders conflicting API requests, or whether file changes are locked, queued or merged.
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Use a conservative operating policy:
- Assign one client as the active prompt writer for a session when making substantial changes.
- Use another client for observation, status checks or short, independent requests.
- Fork a session before pursuing a divergent line of work; the API documents session forking.
- Review the working tree after every automated or remote action.
- Commit or otherwise checkpoint important changes so an unwanted edit can be reverted.
- Do not describe the setup as real-time collaborative editing unless a future release documents those semantics.
If you need deterministic automation, serialize requests in your own client and record the session identifier, request outcome and resulting file changes.
Troubleshooting common connection problems
The second client cannot see sessions
- Confirm both clients use the identical scheme, hostname and port.
- Check that one client did not start a separate server process.
- Verify that the session was created on the server you are querying.
- Check credentials and any browser CORS setting.
The browser connects but API calls fail
Check the configured CORS origin and authentication separately. A browser origin can be allowed while unauthenticated requests are still rejected, or authentication can be correct while the origin is not permitted.
attach or --server is unknown
You may be following instructions for a different documentation surface. Run the installed binary’s help command and use the standard or v2 instructions that match that output.
A remote client times out
Confirm the server bind address, firewall rules and port forwarding. A service bound to remote 127.0.0.1 is not directly reachable from another machine; use SSH forwarding or the documented remote-access method.
A session changes unexpectedly
Look for another attached client, automation job or browser tab using the same session. Because concurrency behavior is unspecified, isolate competing actions and use a fork for independent work.
FAQ
Can I use OpenCode in the terminal and browser at the same time?
Yes, when both connect to the same running server. The web documentation explicitly describes simultaneous web and terminal use with shared sessions and state.
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Do independent OpenCode servers share sessions?
Not according to the documented behavior. Shared sessions apply to clients connected to one server; separate servers should be treated as separate state stores.
Can an SDK connect after the server has started?
Yes. The documented SDK constructor accepts the URL of an already-running server through its baseUrl option.
Is a network-accessible server safe without a password?
No. The web documentation warns that a server without a password is unsecured. Configure the authentication method supported by your installed release before allowing network access.
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Does shared state mean simultaneous edits are conflict-free?
No guarantee is documented. OpenCode’s reviewed server and web materials do not define locking, merge or race-resolution behavior, so coordinate writes and use session forks for divergent work.
Practical deployment checklist
- Identify the OpenCode version and use its matching documentation surface.
- Choose one server process as the source of truth for the clients that must share sessions.
- Set an explicit hostname and port when clients run on different machines or in automation.
- Enable the documented username and password mechanism before network exposure.
- Configure CORS only for the browser origins you actually need.
- Use SSH forwarding when a remote server can remain bound to localhost.
- Test session visibility from each client before sending real prompts.
- Coordinate writes because shared state is not documented as conflict-free.
- Fork sessions for experiments or parallel lines of work.
- Recheck command names and authentication behavior after upgrades.
The Bottom Line
One OpenCode server can serve multiple terminal, web and SDK clients, and the documented web-plus-terminal flow shares sessions and state. For safe operation, connect every client to the same backend, authenticate any network-accessible service, match commands to your release, and assume concurrent edits require coordination until OpenCode documents stronger conflict semantics.
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