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WTF is Claudex?: Claudex is Claude Code's interface and agent tools running with GPT-5.6 Sol as the model.
CLIProxyAPI sits between them and translates the requests.
GPT-5.6 gave Codex a wild week.
Recent reports citing Codex lead Tibo put Codex and ChatGPT Work together near 9 million active users.
OpenAI also merged more of ChatGPT Work and Codex into one desktop experience. Tibo later acknowledged that the reorganization made familiar chats and projects harder to find.
I like GPT-5.6 Sol. The Codex app now feels heavier to me.
Theo found another route: keep Claude Code's focused coding workflow and place GPT-5.6 Sol inside it.
Tibo shared Theo's setup himself. His instructions were short: install CLIProxyAPI, connect it, add an alias, and enjoy "claudex."
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The setup has three parts:
Claude Code = interface, files, tools and agent loop
GPT-5.6 Sol = model doing the reasoning
CLIProxyAPI = local translator connecting them
Claude Code still reads files, runs terminal commands, loads CLAUDE.md, uses skills, connects MCP servers, and launches subagents. Only the model request is routed to OpenAI.
You do not need a Claude subscription
This setup is useful when you want Claude Code's harness but only pay for ChatGPT or Codex.
Claude Code is the program managing your files, terminal, context, permissions, skills, and agents. A Claude subscription gives that program access to Anthropic's models. Claudex points the program at your local CLIProxyAPI endpoint instead.
You still need:
Claude Code installed
a ChatGPT account with Codex and GPT-5.6 access, or an OpenAI API key
CLIProxyAPI running locally
an API key configured for that local proxy
If Claude Code has an old Anthropic login that conflicts with the proxy, run /logout, close the session, and launch it again after adding the proxy settings.
The viral command also makes GPT-5.6 the main model:
claude --model gpt-5.6-sol
CLAUDE_CODE_SUBAGENT_MODEL=gpt-5.6-sol separately gives the same model to spawned subagents. Therefore, both the main session and its subagents use GPT-5.6 Sol.
The model does not need to appear in Claude Code's normal picker. The alias selects it directly when the session starts. Confirm it in the header or with /status.
Step 1: Install and connect CLIProxyAPI
CLIProxyAPI is an open-source local proxy that supports Claude and Codex request formats.
On macOS:
brew install cliproxyapi
On Windows, download the current .exe from the CLIProxyAPI releases page.
Now connect your Codex account through OAuth.
macOS/Linux:
cliproxyapi --codex-login
Windows:
.\CLIProxyAPI.exe --codex-login
Complete the browser login, then start the proxy. Its default local address is http://127.0.0.1:8317.
Theo connected both Claude and Codex accounts so he could switch between providers. Codex authentication is the part required for this GPT-5.6 route.
Step 2: Point Claude Code at the proxy
Open ~/.claude/settings.json and add:
{
"env": {
"ANTHROPIC_BASE_URL": "http://127.0.0.1:8317",
"ANTHROPIC_AUTH_TOKEN": "YOUR_CLIPROXY_API_KEY"
}
}
The token must match an API key configured inside your local CLIProxyAPI setup.
This is the part missing from many reposts. Copying Tibo's alias without connecting Claude Code to the proxy will not work.
Step 3: Create the Claudex command
Add Tibo's alias to ~/.zshrc or ~/.bashrc:
alias claudex='CLAUDE_CODE_SUBAGENT_MODEL=gpt-5.6-sol \
CLAUDE_CODE_ALWAYS_ENABLE_EFFORT=1 \
CLAUDE_CODE_MAX_TOOL_USE_CONCURRENCY=3 \
ENABLE_TOOL_SEARCH=false \
claude --model gpt-5.6-sol'
Restart the terminal and run:
claudex
On Windows, place this function in your PowerShell profile:
function claudex {
$env:CLAUDE_CODE_SUBAGENT_MODEL = "gpt-5.6-sol"
$env:CLAUDE_CODE_ALWAYS_ENABLE_EFFORT = "1"
$env:CLAUDE_CODE_MAX_TOOL_USE_CONCURRENCY = "3"
$env:ENABLE_TOOL_SEARCH = "false"
claude --model gpt-5.6-sol @args
}
Run /status inside Claude Code. The active model should show gpt-5.6-sol, and the proxy logs should show the request reaching Codex.
Read this before using it
This is a community proxy setup promoted by Tibo, not a native Anthropic integration.
Keep CLIProxyAPI on your own machine. Do not send private code or OAuth credentials through an unknown hosted relay.
The screenshot shared by Theo shows API Usage Billing. Your actual charges and limits depend on how CLIProxyAPI is authenticated and configured. Check your OpenAI usage page after a small test before starting a long session.
Tibo ended his post by saying he owed users a reset if the route was blocked. Treat that as permission to experiment, not a permanent guarantee.
Now go and build something great
The ShortList
🛠️Cool Tools of the Week:
Canva Code 2.0: is now available to everyone, including free users.
Claude for Teachers: free access to Claude Premium for K-12 educators
Inkling: Thinking Machine launches its open-weights AI model
Lovable: Apps now work in ChatGPT and Claude
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