OpenAI adds long-running controls for GPT-6 Astra

The Responses API now offers async tool calling, mid-turn steering over WebSockets, and mid-conversation reasoning-effort changes for GPT-6 Astra, while preserving the cached prompt prefix.

Models: GPT-6 Astra

Read on developers.openai.com

Source: OpenAI API changelog, checked Sep 28, 2026. Summarized from the provider’s announcement.