How Wasmer used Codex to build a Node.js runtime for the edge
OpenAI Blog · 2026-06-03
Wasmer, a small edge computing startup, used OpenAI's Codex with GPT-5.5 to build Edge.js — a Node.js runtime for WebAssembly-based edge environments — in two weeks, a project the team estimated would have taken a year without AI assistance.
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Extraction
Topics: ai-coding-assistantsedge-computingwebassemblydeveloper-productivitynode-js
Claims
- Wasmer built a Node.js JavaScript runtime for WebAssembly-based edge computing in two weeks using Codex, compared to an estimated one year without AI.
- Wasmer engineers report a 10x to 20x increase in development speed using Codex with GPT-5.5.
- Codex enabled Wasmer to debug low-level C++ code using tools like the LLD assembly-level debugger, even without deep C++ expertise on the team.
- Edge.js is the first cloud product to provide full Node.js at the edge layer, enabling JavaScript apps, MCPs, and agents to run without Docker.
- As Codex's reasoning improves, engineers are spending less time writing code directly and more time directing the AI toward goals.
Key quotes
We are actually moving out of the IDE itself. We're not touching as much the code, we are just guiding it where we want it to go.
We were able to create a JavaScript runtime in just two weeks. Without AI and without Codex, it would have taken us easily one year.
Codex enabled a small company to achieve things that were only possible at big companies. This project literally would have been impossible without it.