Async/Await & Concurrent API Calls

~20 min read

AI applications make many API calls that can run concurrently. asyncio and async/await are essential for building fast LLM pipelines that do not block on network I/O.

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Key points

  • async def creates a coroutine — must be awaited to run
  • await pauses execution until I/O completes (non-blocking)
  • asyncio.gather() runs multiple coroutines concurrently
  • async for iterates over streaming responses as chunks arrive