Simon Willison’s Weblog

OpenAI cookbook: How to get token usage data for streamed chat completion response (via) New feature in the OpenAI streaming API that I've been wanting for a long time: you can now set stream_options={"include_usage": True} to get back a "usage" block at the end of the stream showing how many input and output tokens were used.

This means you can now accurately account for the total cost of each streaming API call. Previously this information was only an available for non-streaming responses.