opencode VS aider

Dax, the creator of OpenCode — an open-source coding agent, of all the people one might expect to disagree — put the case for hand-coding cleanly in a recent interview about Spec-Driven Development:

Pipa is our agent for studio operations at Lunch Pail Labs. She lives in Slack, is powered by E2B sandboxes, and uses OpenCode for the harness.

One reason I liked OpenSpec more than others, such as Kiro and SpecKit, is that OpenSpec is highly portable between coding assistants, codebases and stages of development. I've plugged OpenSpec into all sorts of projects, from infrastructure to Python libraries. I also work on diverse codebases, with a variety of AI friends that OpenSpec supports: OpenCode, Codex and Claude Code.

Beyond the big names, I would also keep an eye on OpenCode and T3 Code. OpenCode is a solid open-source, terminal-first option if you want a model-agnostic agent and bring your own provider setup. T3 Code is interesting for the opposite reason: it gives you an open-source GUI on top of the agents you may already pay for, like Claude Code, Codex CLI, OpenCode, or Cursor.

Brought to you by the infamous creator of OpenCode, who will exfiltrate all your data, then feign ignorance:

https://github.com/anomalyco/opencode/issues/10416

Aider with a bring-your-own API key has no subscription floor. Pay per token. For 2-3 focused hours per week, costs less than $20/mo. For full-time use, costs more than Max. Best for terminal natives who already live in tmux and do not want a separate IDE.

Aider's GitHub: https://github.com/Aider-AI/aider Lynkr's GitHub: https://github.com/Fast-Editor/Lynkr — star if you want to follow the next integration writeups (OpenHands, Roo Code, Zed are queued).

Look at how the current generation of AI coding tools is built. IDE-integrated agents like Cursor and GitHub Copilot index the open workspace for context. CLI-based agents like Claude Code and Aider operate within a single repository directory. Code intelligence platforms like Sourcegraph Cody can bridge repositories, but doing so requires explicit multi-repo configuration that most teams skip.

Aider is the open-source option. It is a terminal-based pair programmer like Claude Code, but you bring your own model. You can plug it into GPT-4, Claude, or even a local Llama 3 model running on your own machine. The codebase is on GitHub and well maintained.

Aider (aider.chat): Open-source AI pair programmer for the terminal. Works with your git workflow, supports multiple LLM providers, and commits changes automatically.

Aider benchmark harness

OpenCode is a terminal coding agent. It runs in your shell. It has no VS Code extension, no JetBrains plugin, no web UI. When it launched in March 2025 as a Go-based alternative to Aider and Cline, the conventional wisdom was that terminal-only was a deliberate niche — the kind of thing a few vim users would love and the rest of the market would ignore.

Am I misremembering cause I could have sworn that Aider started out as a nvim plugin?? https://github.com/Aider-AI/aider

Aider runs recursive summarization in a background thread using a cheaper "weak model" — a smaller, faster LLM that handles compression while the main model continues reasoning.