OpenAI Unveils New Responses API Features With Astra

Sam Altman ·

Key Info

OpenAI is shipping new Responses API features today alongside Astra, according to a post amplified by Sam Altman. The updates include async function calling, the ability to inject messages mid-reasoning, and changing reasoning effort without invalidating the cache.

Highlights

  • Async function calling lets the model continue working while a tool executes a task.
  • Mid-turn steering lets developers inject messages or tool results into an ongoing reasoning session.
  • Developers can adjust reasoning effort without losing cached context, speeding up iteration.
  • A companion video describes Astra as "GPT-6 Astra," highlighting its ability to handle computer tasks quickly.
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