aider vs opencode: git-committed edits versus a permissioned agent loop
Aider is a Python pair programmer that maps your repo and turns every AI change into a git commit you can diff or revert. OpenCode is a TypeScript terminal agent whose read-only plan mode gates edits and bash commands. They are adjacent tools, not rivals: aider governs the change, opencode governs the exploration that precedes it.
At a glance
| Project | Aider-AI/aider | anomalyco/opencode |
|---|---|---|
| Licence | Apache-2.0Permissive: commercial use allowed | MITPermissive: commercial use allowed |
| Maintenance | Commits in the last six monthsLast push May 22, 2026 | Commits in the last dayLast push September 29, 2026 |
| Language | Python | TypeScript |
| GitHub stars | 49,276 | 210,862 |
| Read more | Our analysisGitHub | Our analysisGitHub |
Which one to choose
Choose aider if you work in git for every project, want each AI edit to land as a discrete commit with a sensible message, and need a codebase map to keep a large repo coherent across Python, JavaScript, Rust, Go or the other languages its README lists.
Choose opencode if you want a terminal agent that can inspect a repository, edit files and run commands under an explicit permission model, and you need a read-only plan mode before touching unfamiliar code.
The core difference: a commit-producing editor versus a permissioned agent loop
Aider's README describes it as AI pair programming in your terminal. The mechanism that defines it is git integration: the README states that aider automatically commits changes with sensible commit messages, so you diff, manage and undo AI changes with familiar git tools. It also builds a map of your entire codebase, which the README says helps it work well in larger projects. That map plus the commit loop is the whole design: the unit of work is a reviewable commit, and the unit of context is a repository map rather than a raw file dump.
OpenCode's README describes a terminal coding agent that can inspect repositories, edit files, run commands and connect to multiple model providers. Its defining mechanism is the agent split. The README documents two built-in agents switched with the Tab key: build, the default full-access agent, and plan, a read-only agent for analysis and code exploration that denies file edits by default and asks permission before running bash commands. A general subagent handles complex searches and multistep tasks and is invoked with @general.
So the axis of comparison is not which edits better. Aider's contract is that the edit is already a commit. OpenCode's contract is that the edit is gated by an agent role you choose. If your review process is git log, aider fits it directly. If your risk is an agent running a destructive command in a repo you have not read yet, opencode's plan agent is the control that aider's README does not describe.
Getting each one running
Aider's README gives a pip-based path: python -m pip install aider-install, then aider-install, then cd into your project and start it with a model and key, for example aider --model deepseek --api-key deepseek=<key>, aider --model sonnet --api-key anthropic=<key>, or aider --model o3-mini --api-key openai=<key>. The README states aider works best with Claude 3.7 Sonnet, DeepSeek R1 and Chat V3, OpenAI o1, o3-mini and GPT-4o, and can connect to almost any LLM including local models. It is a Python project, so the practical constraint is a Python environment, and it is a wrapper: the earlier analysis notes it depends on a model provider and does not supply the model itself. Installation instructions and usage documentation are linked from the README.
OpenCode's README lists many install routes: a curl install script, npm, bun, pnpm or yarn, scoop and choco on Windows, two Homebrew formulae on macOS and Linux (anomalyco/tap/opencode, described as recommended and always up to date, and the official brew formula, described as updated less), pacman and paru on Arch, mise, and nix. The install script resolves its directory in a documented priority order: $OPENCODE_INSTALL_DIR, then $XDG_BIN_DIR, then $HOME/bin, then $HOME/.opencode/bin. The README also notes a desktop app in beta with per-platform downloads, and warns to remove versions older than 0.1.x before installing.
That breadth is the point of difference at install time. Aider's README documents one primary path plus a model key. OpenCode documents a dozen package managers and a desktop build, and the README itself flags that the two Homebrew formulae track different update cadences. If you standardize on Homebrew, choose the tap formula deliberately, because the README says the official one is updated less.
Context and change control: repository maps versus plan mode
Aider's README states it makes a map of your entire codebase, and the earlier analysis advises testing how that map behaves on your project's structure with a small repository before adopting. The map is the mechanism that lets a terminal tool reason about a large project without pasting files. It also lists linting and testing: aider can automatically lint and test your code every time it makes changes and can fix problems detected by your linters and test suites. The earlier analysis adds the precondition: confirm your linter and test commands are compatible with that automated loop.
OpenCode's control surface is different. The plan agent denies edits by default and asks permission before bash commands, which is a gate on action rather than a map of context. The README does not describe a repository map or an automatic lint and test loop. What it does describe is agent selection: build for development work with full access, plan for exploration, and @general for complex searches and multistep tasks. The earlier analysis calls the plan agent the feature that separates opencode from a plain CLI wrapper, and recommends testing its permission prompts on a sample repository.
Read together, the two tools answer different questions. Aider answers how do I see and undo what the model did, through commits and an automated lint and test pass. OpenCode answers what is the agent allowed to do right now, through a role that withholds edit and command permissions. A team that already trusts its tests can lean on aider's loop. A team pointing an agent at a production-shaped repository for the first time gets more from opencode's default-deny plan mode.
Operations, scale and the model-provider dependency
Both tools are terminal-first, and both depend on an external model provider. Aider's README is explicit that it connects to cloud and local LLMs, with a best-with list and support for almost any model including local ones. The earlier analysis warns that aider is a wrapper depending on a model provider, and that before adopting you should verify which models your team's budget and privacy policies allow. That is the operational cost of scale: every engineer needs a key and a budget line, and the provider's terms govern training and data retention even though aider itself is Apache-2.0.
OpenCode's README states it connects to multiple model providers but does not enumerate them, so provider support must be checked against its docs. Its scale story is distribution rather than governance: many package managers, a desktop beta, and an install script with a defined directory priority, which matters for fleet installs where you cannot rely on a user's PATH. The README's own note that the official Homebrew formula is updated less than the tap is the kind of drift that shows up in mixed-version fleets.
On change control at scale, aider's automatic commits mean a busy session produces a chain of commits. That is auditable, and the earlier analysis says the value depends on your willingness to read every commit it makes. OpenCode's plan mode produces no commits by default, so the audit trail is whatever you write after the plan is approved. Neither README documents rollback semantics beyond aider's reliance on git and opencode's permission prompts, so treat rollback as a git problem in both cases.
Where each one falls short
Aider's README does not document a read-only planning mode, an agent-role switch, or a desktop application. It is Python and installed through pip, so environments without a usable Python toolchain are a poor fit. It requires an API key for a model provider in every example the README gives, and the earlier analysis says to avoid it if you need a tool that does not require an external LLM API key or if you prefer a GUI IDE experience. Its automated lint and test loop is only as good as the commands you configure, and the earlier analysis flags compatibility as something to confirm rather than assume. Finally, the earlier analysis is blunt that aider is not a replacement for human review.
OpenCode's README does not document git commit automation, a codebase map, or a lint and test loop, so a team that wants every AI change to arrive as a reviewable commit will not get that from opencode's documented behaviour. Its README also does not enumerate supported model providers, which makes the provider check a docs task rather than a README task. The desktop app is labelled beta. The install surface is wide enough that version skew is a real concern, and the README's own warning about removing pre-0.1.x versions suggests upgrades have not always been clean.
Both READMEs are silent on rollback beyond their respective mechanisms, and neither documents a hosted control plane for team policy. If you need centralized audit or per-seat policy enforcement, you are building it around either tool.
Licence and maintenance implications
Aider is Apache-2.0. The earlier analysis states that licence permits commercial use, but that you must still check each model provider's terms for training and data retention. That is the practical split: the code is permissive, the inference is not. Aider's last push was 2026-05-22, which is more than six months before today, so it should not be described as actively maintained on the strength of that date alone. Its most recent release listed is v0.86.0 from 2025-08-09, with v0.85.0 from 2025-06-27 and v0.84.0 from 2025-05-30 before it. The repository is not archived, but a reader weighing a long-lived dependency should note the gap between the last release and the last push and plan accordingly.
OpenCode is MIT, which is also permissive for commercial use and, like aider, says nothing about the model provider's terms. Its last push was 2026-09-17, three days before today, and its recent releases run v1.18.23 on 2026-08-25, v1.18.24 and v1.18.25 both on 2026-08-28. The repository is not archived. On the evidence of the last push and the release cadence, opencode is the more frequently updated of the two. Neither licence change alters the provider-terms obligation, and neither README documents a support commitment or a long-term release policy.
Which to pick for concrete situations
If your team already reviews code through pull requests and wants AI edits to arrive as commits with messages, aider is the closer fit, because the README's git integration makes the commit the unit of work. If you are onboarding onto an unfamiliar repository and want an agent that cannot edit or run commands without asking, opencode's plan agent is the documented control, and aider's README does not describe an equivalent.
If you need a codebase map for a large, multi-language project, aider's README documents one and lists support for 100+ code languages. If you need broad install coverage across macOS, Linux, Windows and Arch, plus a desktop beta, opencode's README documents that surface and aider's does not.
If your environment forbids external model APIs, neither tool's README solves that on its own; aider's README does state support for local models, which is the nearest documented answer. If your linter and test commands are already reliable, aider's automated lint and test loop is documented and worth configuring. If they are not, that loop will surface failures you have to triage.
For a team that wants both, the natural split is opencode's plan agent for reading and scoping, then aider for the committed implementation, with the model provider terms checked once for both. Nothing in either README documents an integration between them, so that pairing is a workflow choice rather than a supported feature.
Bottom line
Pick aider when the review artifact matters most: git commits, a repository map, and a lint and test loop, on the understanding that its last push was 2026-05-22 and its most recent listed release was v0.86.0 on 2025-08-09. Pick opencode when you want a permissioned agent loop with a read-only plan mode and a wide install surface, on the strength of a last push on 2026-09-17 and releases through v1.18.25. Before committing, verify three things: which model providers each tool supports against your budget and data-retention rules, that your linter and test commands work with aider's automated loop, and that opencode's plan-agent permission prompts behave as you expect on a sample repository. If you must choose one today, choose opencode for exploration and aider for committed change, and do not assume either README's silence on rollback means rollback is handled.