obviously the best model we have ever produced, but also one of the best blog posts we have ever produced: openai.com/index/gpt-5-6/↗

Notes on Claude Opus 4.8, plus pelicans riding bicycles for each of the five different thinking efforts simonwillison.net/2026/May/28/cl…↗

1/ today we're releasing muse spark, the first model from MSL. nine months ago we rebuilt our ai stack from scratch. new infrastructure, new architecture, new data pipelines. muse spark is the result of that work, and now it powers meta ai. 🧵↗

We released Claude Opus 4.6 just two months ago. Today we're sharing some info on our new model, Claude Mythos Preview.↗