This is a heavily interactive web application, and JavaScript is required. Simple HTML interfaces are possible, but that is not what this is.
Post
Simon Willison
simonwillison.net
did:plc:kft6lu4trxowqmter2b6vg6z
New super-fast model from OpenAI today powered by their new Cerebras partnership - GPT-5.3-Codex-Spark
It's 4-5x faster than GPT-5.3-Codex but the pelican isn't as good!
Here's its pelican compared to full GPT-5.3 Codex, both on "medium" https://simonwillison.net/2026/Feb/12/codex-spark/
2026-02-12T21:24:29.154Z