def retrieve(
        self,
        step_id: str,
        *,
        thread_id: str,
        run_id: str,
        include: List[RunStepInclude] | NotGiven = NOT_GIVEN,
        # Use the following arguments if you need to pass additional parameters to the API that aren't available via kwargs.
        # The extra values given here take precedence over values defined on the client or passed to this method.
        extra_headers: Headers | None = None,
        extra_query: Query | None = None,
        extra_body: Body | None = None,
        timeout: float | httpx.Timeout | None | NotGiven = NOT_GIVEN,
    ) -> RunStep:
        """
        Retrieves a run step.

        Args:
          include: A list of additional fields to include in the response. Currently the only
              supported value is `step_details.tool_calls[*].file_search.results[*].content`
              to fetch the file search result content.

              See the
              [file search tool documentation](https://platform.openai.com/docs/assistants/tools/file-search#customizing-file-search-settings)
              for more information.

          extra_headers: Send extra headers

          extra_query: Add additional query parameters to the request

          extra_body: Add additional JSON properties to the request

          timeout: Override the client-level default timeout for this request, in seconds
        """
        if not thread_id:
            raise ValueError(f"Expected a non-empty value for `thread_id` but received {thread_id!r}")
        if not run_id:
            raise ValueError(f"Expected a non-empty value for `run_id` but received {run_id!r}")
        if not step_id:
            raise ValueError(f"Expected a non-empty value for `step_id` but received {step_id!r}")
        extra_headers = {"OpenAI-Beta": "assistants=v2", **(extra_headers or {})}
        return self._get(
            f"/threads/{thread_id}/runs/{run_id}/steps/{step_id}",
            options=make_request_options(
                extra_headers=extra_headers,
                extra_query=extra_query,
                extra_body=extra_body,
                timeout=timeout,
                query=maybe_transform({"include": include}, step_retrieve_params.StepRetrieveParams),
            ),
            cast_to=RunStep,
        )

        Retrieves a run step.

        Args:
          include: A list of additional fields to include in the response. Currently the only
              supported value is `step_details.tool_calls[*].file_search.results[*].content`
              to fetch the file search result content.

              See the
              [file search tool documentation](https://platform.openai.com/docs/assistants/tools/file-search#customizing-file-search-settings)
              for more information.

          extra_headers: Send extra headers

          extra_query: Add additional query parameters to the request

          extra_body: Add additional JSON properties to the request

          timeout: Override the client-level default timeout for this request, in seconds
        
src/openai/resources/beta/threads/runs/steps.py