Gigacode – Use OpenCode's UI with Claude Code/Codex/Amp
Gigacode is an experimental, just-for-fun project that makes OpenCode's TUI + web + SDK work with Claude Code, Codex, and Amp. It's not a fork of OpenCode. Instead, it implements the OpenCode protocol and just runs `opencode attach` to the server that converts API calls to the underlying agents. We build this to scratch our itch of being able to rapidly switch between coding agents based on the task at hand. For example, we find that: - Claude Code is the best executor & fast iterator - Codex (high) is the best for complex or long-running tasks - OpenCode for fine-tuned, do-exactly-as-I-say…
In plain words
Gigacode is an experimental tool that lets developers use Claude Code, Codex, and Amp through OpenCode's interface and SDK. It implements the OpenCode protocol to convert API calls between different coding agents, allowing users to switch between them based on task requirements. The project addresses the need to pair different AI models with appropriate interfaces, recognizing that the model harness significantly impacts performance for different coding workflows.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Gigacode is an experimental, just-for-fun project that makes OpenCode's TUI + web + SDK work with Claude Code, Codex, and Amp. It's not a fork of OpenCode. Instead, it implements the OpenCode protocol and just runs `opencode attach` to the server that converts API calls to the underlying agents. We build this to scratch our itch of being able to rapidly switch between coding agents based on the task at hand. For example, we find that: - Claude Code is the best executor & fast iterator - Codex (high) is the best for complex or long-running tasks - OpenCode for fine-tuned, do-exactly-as-I-say edits I personally believe that harnesses matter almost as much as the models in 2026. OpenCode lets you swap out models already, but the CC & Codex harnesses + system prompts make a big difference in practice. Under the hood, this is all powered by our Sandbox Agent SDK: - Sandbox Agent SDK provides a universal HTTP API for controlling Claude Code, Codex, and Amp - Sandbox Agent SDK exposes an OpenCode-compatible endpoint so OpenCode can talk to any agent - OpenCode connects to Sandbox Agent SDK via attach I want to emphasize: the Anomaly folks are doing awesome work with OpenCode agent + Zen + Black. I use OC regularly alongside CC & Codex depending on the task. Gigacode is only possible because OpenCode is insanely flexible, hackable, and well documented. Give it a try: $ curl -fsSL https://releases.rivet.dev/sandbox-agent/latest/gigacode-ins... | sh Check out the project, architecture, and other install options: https://github.com/rivet-dev/sandbox-agent/tree/main/gigacod...
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