Gigacode – Use OpenCode's UI with Claude Code/Codex/Amp

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

Run Coding Agents in Sandboxes. Control Them Over HTTP. Supports Claude Code, Codex, OpenCode, and Amp. - sandbox-agent/gigacode at main · rivet-dev/sandbox-agent

This is not a fork (and never will be). It's powered by Sandbox Agent SDK 's wizardry. Experimental & just for fun. ┌─ Gigacode ────────────────────────────────────────────────────────┐ │ ┌─────────────────┐ ┌─────────────────┐ ┌─────────────────┐ │ │ │ OpenCode TUI │───▶│ Sandbox Agent │───▶│ Claude Code / │ │ │ │ │ │ │ │ Codex / Pi / Amp │ │ │ └─────────────────┘ └─────────────────┘ └─────────────────┘ │ └───────────────────────────────────────────────────────────────────┘ Sandbox Agent SDK provides a universal HTTP API for controlling Claude Code, Codex, Pi, and Amp Sandbox Agent SDK exposes an OpenCode-compatible endpoint so OpenCode can talk to any agent OpenCode connects to Sandbox…from github.com

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…

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