Itsme23476

Claude Zen — Development skill for Claude Code

Development community

Run Claude Code on free models through OpenCode Zen.

How to install Claude Zen

This entry records only its repository, not the path inside it, so there is no exact command to give. Open Itsme23476/claude-zen and copy the folder into ~/.claude/skills/, or the file into ~/.claude/agents/.

What Claude Zen does

Run Claude Code on free models through OpenCode Zen. Local Anthropic-protocol bridge + one-command install.

Alternatives in Development

Claudecode — Open Source ClaudeCode Leaked 1k ★
Hive — Browser-native hive-mind for CLI coding agents — Claude Code, Codex, Gemini, and OpenCode collaborate as real 473 ★
Mythos Router — The leaked Anthropic reasoning protocol 294 ★

README

claude-zen

Run **Claude Code** on free models through [OpenCode Zen](https://opencode.ai) — a small local proxy that translates Zen's OpenAI-style API into the Anthropic protocol Claude Code speaks.

Default model is `deepseek-v4-flash-free`. Cost: $0.

Unofficial community tool. Not affiliated with or endorsed by Anthropic or OpenCode. It relies on a third party's free tier, which can change or disappear at any time.

**Requirements:** macOS or Linux, Node 18+, Python 3, and Claude Code installed. Windows works under WSL only.

Install

git clone https://github.com/Itsme23476/claude-zen
cd claude-zen
./install.sh          # asks for your Zen API key
./verify.sh           # proves it works

Get a free key at [opencode.ai](https://opencode.ai). It looks like `sk-` plus 61 characters.

Then:

claude-zen

That's it. The proxy auto-starts if it isn't running.

Usage

claude-zen                       # interactive, default free model
claude-zen -m longcat-2.0-free   # pick a specific model
claude-zen -p "explain this bug" # one-shot, no TUI
claude-zen --status              # proxy state + live free-model list

Anything after those flags is passed straight through to `claude`, so `claude-zen --permission-mode acceptEdits` and friends all work.

**The `/model` picker won't list these models.** Switching means quitting and relaunching with a different `-m`. That's a Claude Code limitation.

Why a proxy is needed

The obvious setup — pointing `ANTHROPIC_BASE_URL` straight at `https://opencode.ai/zen` — does not work.

Zen's Anthropic-compatible `/v1/messages` endpoint mangles tool schemas when it translates them to OpenAI format, dropping `function.name`:

Failed to deserialize the JSON body into the target type:
tools[0].function: missing field `name`

The models themselves do tool calling perfectly — the identical request to `/v1/chat/completions` returns a correct `tool_calls` response. Only the Anthr