2026
GPT-6 Astra Review: The Best Agent Anyone Has Shipped, and the First That Hides Its WorkSep 06 · 14 minOpenAI shipped GPT-6 Astra on September 3 at $10 in and $50 out, the same headline price as Claude Fable 5.1. The benchmarks are a real jump, the cache price is four times higher, and the model uses a reasoning technique that makes its chain of thought harder to monitor. Here is the whole picture.Claude Fable 5.1 Review: Benchmarks Went Up, but the Cache Price Cut Is the Real ReleaseSep 02 · 12 minAnthropic shipped Claude Fable 5.1 and Mythos 5.1 on September 1 at the same $10 in, $50 out price as Fable 5, then cut cache reads by 75%. Here are the benchmarks that moved, what the pricing change actually does to an agentic bill, and whether it is worth switching.