OpenCode alternatives, when one agent at a time is not enough

What we ran ourselves

OpenCode was installed on our Linux test machine at 1.19.3. No provider credentials were set: opencode auth list reported 0 credentials. The models it listed without them were the free ones its own provider offers. Every run used opencode/deepseek-v4.1-flash-free, so nothing here depends on a paid account. The point of the captures is the working directory, not the model. Every line is a real run, pasted as printed, apart from two cuts. The agent replies are marked [reply omitted] or cut with .... The schema-format warnings OpenCode writes to its error stream at start-up are left out.

One headless run

First, the basic shape: run a prompt with no interface, then check what landed on disk.

$ opencode --version
1.19.3
$ opencode models | wc -l
10
$ opencode auth list
└  0 credentials

$ git init -q /tmp/oc-run1
$ cd /tmp/oc-run1
$ printf 'hello\n' > note.txt
$ git add note.txt
$ git -c user.name=capture -c user.email=capture@example.com commit -qm init
$ opencode run --auto -m opencode/deepseek-v4.1-flash-free "Create a file named greeting.txt whose contents are exactly: Hello from OpenCode. Then reply with the single word DONE."
DONE
$ ls
greeting.txt
note.txt
$ cat greeting.txt
Hello from OpenCode

The run found the repository, wrote the file and stopped. No prompt appeared, and nothing needed a person at the keyboard. That is the mode you would script. It is also the mode a desktop app has to drive, if it wants to put OpenCode next to other agents.

Captured on our Linux test machine on October 17, 2026, with OpenCode 1.19.3 and git 2.43.0, in a throwaway repository under the temp directory. Each line starting with $ is a command. Every other line is what the program printed.

Two sessions, one directory

Next, the case the features list does not settle. One repository, two sessions launched in it one after the other, each told to write the same file. Neither has a working copy of its own.

$ git init -q /tmp/oc-shared
$ cd /tmp/oc-shared
$ printf '<h1>v1</h1>\n' > index.html
$ git add index.html
$ git -c user.name=capture -c user.email=capture@example.com commit -qm "first pass"
$ opencode run --auto -m opencode/deepseek-v4.1-flash-free "Overwrite index.html so that its contents are exactly: <h1>changed by session A</h1> followed by a single newline. Do nothing else."
[reply omitted]
$ cat index.html
<h1>changed by session A</h1>
$ opencode run --auto -m opencode/deepseek-v4.1-flash-free "Overwrite index.html so that its contents are exactly: <h1>changed by session B</h1> followed by a single newline. Do nothing else."
Stopping before I write — this would clobber another agent's uncommitted work.
...
I haven't written anything. How do you want to proceed?
$ cat index.html
<h1>changed by session A</h1>

That refusal was the model's own judgement, not a lock. It read git status, saw session A's uncommitted edit, and stopped to ask. The same prompt was run again on a fresh copy of the same setup. That time it wrote straight over session A without a word.

$ opencode run --auto -m opencode/deepseek-v4.1-flash-free "Overwrite index.html so that its contents are exactly: <h1>changed by session B</h1> followed by a single newline. Do nothing else."
Done.
$ cat index.html
<h1>changed by session B</h1>
$ git status --short
 M index.html
$ git diff
diff --git a/index.html b/index.html
index f4bbc8a..b4583d8 100644
--- a/index.html
+++ b/index.html
@@ -1 +1 @@
-<h1>v1</h1>
+<h1>changed by session B</h1>
$ git log --oneline
e2e61d0 first pass

Two runs of one instruction gave two outcomes. Neither is parallel work. One session spent its turn asking a question nobody was there to answer. The other erased the first session's change. Git holds one modified file and one changed line against the last commit. There is no trace that a first session ran, and no conflict to explain it.

Two runs in one folder share one set of files. We did not test OpenCode's built-in multi-session feature here. This test is about the working copy, and about what happens when two sessions write to the same one.

Both captured on the same machine and day in two throwaway repositories, with the same OpenCode 1.19.3 and git 2.43.0. The second capture was a fresh directory with the same starting commit, not a retry in the first one. The refusal is quoted with ... where the middle of it is cut. The first and last lines are as printed.

The same two sessions, each in its own working copy

Now the same two sessions, with one git worktree each before either starts. A worktree is a separate working copy of the repository on its own branch. Same repository, same file, same two prompts.

$ git init -q /tmp/oc-copies
$ cd /tmp/oc-copies
$ printf '<h1>v1</h1>\n' > index.html
$ git add index.html
$ git -c user.name=capture -c user.email=capture@example.com commit -qm "first pass"
$ git worktree add ../oc-a -b session-a
Preparing worktree (new branch 'session-a')
HEAD is now at 5d4357c first pass
$ git worktree add ../oc-b -b session-b
Preparing worktree (new branch 'session-b')
HEAD is now at 5d4357c first pass
$ cd ../oc-a
$ opencode run --auto -m opencode/deepseek-v4.1-flash-free "Overwrite index.html so that its contents are exactly: <h1>changed by session A</h1> followed by a single newline. Do nothing else."
[reply omitted]
$ cat index.html
<h1>changed by session A</h1>
$ cd ../oc-b
$ opencode run --auto -m opencode/deepseek-v4.1-flash-free "Overwrite index.html so that its contents are exactly: <h1>changed by session B</h1> followed by a single newline. Do nothing else."
[reply omitted]
$ cat index.html
<h1>changed by session B</h1>
$ cd /tmp/oc-copies
$ cat ../oc-a/index.html
<h1>changed by session A</h1>
$ cat ../oc-b/index.html
<h1>changed by session B</h1>
$ git -C ../oc-a status --short
 M index.html
$ git -C ../oc-b status --short
 M index.html
$ git worktree list
/tmp/oc-copies  5d4357c [master]
/tmp/oc-a       5d4357c [session-a]
/tmp/oc-b       5d4357c [session-b]

Both changes survived. Each directory holds only its own session's work. Each branch is its own, and each status shows one modified file and nothing else. That is the difference between the captures, and it is the mechanism Omniscio's worktree isolation switch turns on. A session gets its own branch and working directory instead of sharing yours. OpenCode is the agent in every capture above. What changed was where each session ran.

Two other mechanisms are worth knowing about. OpenCode's own subagents, which are smaller helper agents a session can hand a task to, keep work apart inside one tool. Crush keeps several sessions per project the same way. Both are a different thing from two independent sessions on one set of files.

Captured on the same machine and day, in a third throwaway repository, with the same OpenCode 1.19.3 and git 2.43.0. The two worktrees are cheap because the .git entry inside each one is a text file pointing back at the repository, rather than a second copy of it.

How the alternatives compare

On a narrow screen, scroll the table sideways to see every column.

Every cell about a rival quotes or closely paraphrases its own documentation, README or release list, read on October 17, 2026. Cost means the tool itself, not the model tokens you buy from a provider.

When each one is the better pick

Stay on OpenCode if

The terminal is where you work, and you want to choose the model yourself. The free, MIT-licensed tool is part of why you picked it. OpenCode covers the terminal, a desktop app and a web interface. It connects to 75+ providers including local models. If your work is one session at a time, the alternatives below buy you little and cost you a migration.

Claude Code, if you want the first-party Claude tool

Claude Code is Anthropic's own agent. It runs in the terminal, in an IDE, in a desktop app and in a browser. Most surfaces need a Claude subscription or an Anthropic Console account. The terminal CLI and the VS Code and JetBrains extensions also support third-party providers. If your work is on Claude models, and you would rather use the vendor's tool than configure a provider, this is the direct swap. The trade is that you leave the any-provider position OpenCode gives you.

Codex CLI, if your plan is already with OpenAI

Codex CLI runs locally and signs in with ChatGPT. It works on a Plus, Pro, Business, Edu or Enterprise plan, and an API key is the other route. It also has an IDE extension and a desktop app. OpenAI's models are the default, and other providers or a local model go in through configuration. If you pay for ChatGPT anyway, you pay nothing extra to use it. OpenCode can also sign in with a ChatGPT Plus or Pro plan, so this is not a unique gain for Codex.

Aider, if you want git-shaped pair programming

Aider is the pair-programming shape. It maps the codebase and works with most popular languages and most LLMs. It commits its changes with messages of its own, so ordinary git tools can diff and undo them. It has been around a long time, and its release pace is slower now. The dates are in How we tested, and they read as a fact about cadence rather than a verdict.

Crush, if you want several sessions inside one terminal

Crush keeps multiple work sessions and contexts per project. It switches models mid-session while keeping the context, and it uses LSPs, the language-server support your editor uses, for context. It runs on Windows in PowerShell and WSL, and on the BSDs and Android. Its licence is the Functional Source License, which is source-available rather than open source under the Open Source Initiative's definition. If you like the Charm style of terminal tooling, this will feel familiar.

Omniscio, if the problem is many sessions rather than one agent

Omniscio is ours, so weigh this one with that in mind. It is a desktop app for Windows, macOS and Linux. It runs many sessions across projects at once, with an attention-first inbox that floats the sessions needing you to the top. Desktop notifications reach you while you are away, and a per-session cost cap stops a session that crosses its limit. OpenCode is one of the harnesses it runs, so the agent you already use can sit in the same list as a Claude Code or Codex session.

One thing Omniscio is not

Omniscio is not open source. Its pages offer no source download and no public repository. If the MIT license and the ability to read the code are part of why you chose OpenCode, those reasons stay with OpenCode. The two fit together: OpenCode stays the agent, and Omniscio is the window over the sessions.

What changes when you add an orchestrator

Omniscio does not replace OpenCode. OpenCode is one of the harnesses it supports, so the same agent runs, and what changes is what surrounds it. Sessions from several projects live in one list, and the ones that need a person move above the ones that do not.

The mechanism from the captures above becomes a switch. Worktree isolation gives a session its own branch and working directory. Two OpenCode sessions on the same repository then stop writing over each other once it is on. It is off until you turn it on, per session, per project or for the whole app. You decide when the extra branches are worth it.

Those sessions land in a single attention-first inbox, and desktop notifications reach you while you are away from the app. A per-session cost cap stops that session when it reaches the limit.

Related pages

• Guide

  How to run many sessions at once

  Isolation, worktrees and the mistakes that cost you an afternoon, with the commands.

• Comparison

  A Claude Squad alternative with a GUI

  The same two-session test on a terminal orchestrator, and what a window changes.

• Comparison

  Every comparison on one page

  The desktop apps and terminal tools people weigh against each other, checked against their own docs.

• Pricing

  What Omniscio costs

  What each plan includes, and what it does not.