Azure OpenAI Responses stream ended without a stop reason

Error message

Azure OpenAI Responses stream ended without a stop reason

What it means

Error "Azure OpenAI Responses stream ended without a stop reason" thrown in earendil-works/pi.

Source

Thrown at packages/ai/src/api/azure-openai-responses.ts:138

			const { data: openaiStream, response } = await retryProviderRequest(
				() => client.responses.create(params, requestOptions).withResponse(),
				{
					maxRetries: options?.maxRetries,
					maxRetryDelayMs: options?.maxRetryDelayMs,
					signal: options?.signal,
				},
			);
			await options?.onResponse?.({ status: response.status, headers: headersToRecord(response.headers) }, model);
			stream.push({ type: "start", partial: output });

			await processResponsesStream(openaiStream, output, stream, model, { grammarToolInputProperties });

			if (options?.signal?.aborted) {
				throw new Error("Request was aborted");
			}

			if (output.stopReason === "pending") {
				throw new Error("Azure OpenAI Responses stream ended without a stop reason");
			}
			if (output.stopReason === "aborted" || output.stopReason === "error") {
				throw new Error(output.errorMessage || "An unknown error occurred");
			}

			stream.push({ type: "done", reason: output.stopReason, message: output });
			stream.end();
		} catch (error) {
			for (const block of output.content) {
				delete (block as { index?: number }).index;
				// Streaming scratch buffers are only used during parsing; never persist them.
				delete (block as { partialJson?: string }).partialJson;
				delete (block as { customInput?: unknown }).customInput;
			}
			output.stopReason = options?.signal?.aborted ? "aborted" : "error";
			output.errorMessage = formatAzureOpenAIError(error);
			stream.push({ type: "error", reason: output.stopReason, error: output });
			stream.end();

View on GitHub (pinned to 4af9d21d3b)

Solutions

Retry; check for truncated Azure SSE streams or proxy buffering.

When it happens

Trigger: Thrown at packages/ai/src/api/azure-openai-responses.ts:138 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of earendil-works/pi@4af9d21d3b (2026-08-24). Data as JSON: /api/errors/92a5877b90c9bbd3. Report an issue: GitHub.