Vercel Labs open-sources fx, a Zig coding agent built for embedding

Vercel Labs has open-sourced fx, an experimental coding agent and CLI written in Zig. It ships as a 6.3 MiB native binary with a 10-microsecond cold start and is exposed through a CLI, the libfx library and a WebAssembly build.

• 6.3 MiB binary with single-digit-MB memory baseline and 10 µs cold start
• Available via CLI, libfx for JavaScript and a WebAssembly build
• Release 0.0.11 added connections to Ollama, OpenRouter and ChatGPT
• Experimental project; 0.0.13 added an Ultrafast mode on supported OpenAI models