GPT-6 Astra joins the Ultra tier

GPT-6 Astra - OpenAI's most capable model, built for the hardest end-to-end work - is now available on the Ultra tier, next to Claude Fable 5.1. OpenAI launched it yesterday behind a limited-access program; our access opened this morning and it went through our full verification the same hour: live tool-calling, prompt caching, and token accounting all confirmed on the real wire before it reached the picker.

Astra is priced identically to Claude Fable 5.1 ($10 / $50 per million tokens at the provider), and because its tokenizer encodes the same work to roughly a third fewer tokens, the same build tends to cost fewer credits. Claude Fable 5.1 remains the Ultra default.