GPT-6 Astra, Looped Transformers, and Hidden Reasoning

2026-09-10

GPT-6 Astra is a very strong model, and it makes a particularly large leap in computer use. The model likely uses a variant of the looped transformer, which gives better modeling performance at a fixed compute budget. Shorter reasoning traces are a side effect of more intelligent models that make fewer mistakes and can access more compute internally inside their architecture.