CodeMuxWhat is CodeMux?
CodeMux is a multi-model AI coding agent for Visual Studio Code. It can plan, code, and review a task with different models for each step, then presents one result along with the checks it ran.
FAQ
Questions about CodeMux, answered.
Short answers on model routing, verification, supported providers, pricing, and using your own API.
Which AI providers and models does CodeMux support?
The managed catalog currently includes OpenAI: GPT-6 Luna, GPT-6.1 Sol, GPT-6 Astra; Anthropic: Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5, Claude Fable 5; DeepSeek: DeepSeek V4.1 Flash 1017, DeepSeek V4 Pro; xAI: Grok 4.6, Grok 4.7; Google: Gemini 3.8 Flash, Gemini 4 Argon. Availability can change, so the catalog inside the extension is the authoritative list.
Why use more than one model for a coding task?
You configure Fast, Strong, and Maximum. Each new task starts at your chosen level and can move upward between model calls while keeping the same task context and completed tool results.
Does CodeMux verify the code it writes?
It can run your repository’s checks and records the results, including anything it could not verify. A completed run is not a guarantee that the code is correct. Review the changes and remaining checks before keeping the work.
Which languages does CodeMux support?
It edits any workspace text through the same tools. TypeScript, JavaScript, Python, and Go are the languages CodeMux claims, using VS Code’s TypeScript language service for JS/TS and the Python or Go extension when installed. Local checks such as npm test, pytest, and go test run when those commands are allowed. Hover, format, and rename for Python and Go need the matching editor extension. Java and C# files can still be edited without a claimed fixture-backed loop.
How much does CodeMux cost?
The extension is free to install and there is no subscription. New accounts get $1 in free credit to try a real task. After that, managed models draw from a single pay-as-you-go balance, which you can top up from $5.
Can I use my own AI API?
Yes. Connect a compatible endpoint and CodeMux sends those requests straight to it. Your provider bills you at its own rates; nothing is deducted from your CodeMux balance.
Is CodeMux affiliated with the model providers or other coding agents?
No. CodeMux is an independent product. Third-party company, model, and product names belong to their respective owners.
Still have a question?
Email the CodeMux team. We reply from the same address.