This is a heavily interactive web application, and JavaScript is required. Simple HTML interfaces are possible, but that is not what this is.
Post
mr. TIM
timkellogg.me
did:plc:ckaz32jwl6t2cno6fmuw2nhn
GPT-5.5 (Spud)
Most intelligent model with a public release. Available in ChatGPT & Codex. API availability soon after more testing.
Better on benchmarks than Opus 4.7, however reports are that Opus gives better plans.
Notoriously, this model is fully-retrained
https://openai.com/index/introducing-gpt-5-5/
2026-04-23T18:11:38.445Z