Steer GPT-6 Astra Mid-Turn Without Losing Its Work

On September 3, 2026, OpenAI shipped GPT-6 Astra. Most of the coverage went to the benchmarks and the cyber capability warnings. The thing that actually changes how you write agent code got two paragraphs in the docs: mid-turn steering.

Here is the problem it solves. You kick off a long agentic run. Ninety seconds in, watching the trace, you realize you gave it the wrong constraint. Today you have exactly two options: let it burn to completion and then send a correction as a second turn, or kill the request and start over. Option one wastes the output tokens. Option two wastes everything, including the tool calls it already made against your systems.