fix(ai): identify Responses error providers

closes #9298

packages/ai/CHANGELOG.md

@@ -18,6 +18,7 @@
 - Fixed the DeepSeek catalog to advertise `deepseek-flash` for DeepSeek V4.1 Flash instead of retired Flash aliases, and refreshed DeepSeek pricing metadata ([#9423](https://github.com/earendil-works/pi/issues/9423)).
 - Removed GPT-5.4 and GPT-5.4 mini from the OpenAI Codex catalog after they became unavailable to ChatGPT accounts ([#9394](https://github.com/earendil-works/pi/issues/9394)).
 - Fixed Mistral-hosted GLM-5.2 reasoning requests to use `reasoning_effort` instead of the ignored `prompt_mode` ([#9375](https://github.com/earendil-works/pi/issues/9375)).
+- Fixed OpenAI-compatible Responses errors to identify the actual provider instead of always labeling them as OpenAI errors ([#9298](https://github.com/earendil-works/pi/issues/9298)).
 
 ## [0.85.1] - 2026-09-05
 

packages/ai/src/api/openai-responses.ts

@@ -98,10 +98,6 @@ function getPromptCacheOptions(
 	return undefined;
 }
 
-function formatOpenAIResponsesError(error: unknown): string {
-	return formatProviderError(normalizeProviderError(error), "OpenAI API error");
-}
-
 // OpenAI Responses-specific options
 export interface OpenAIResponsesOptions extends StreamOptions {
 	reasoningEffort?: "minimal" | "low" | "medium" | "high" | "xhigh" | "max";
@@ -199,7 +195,10 @@ export const stream: StreamFunction<"openai-responses", OpenAIResponsesOptions>
 				delete (block as { customInput?: unknown }).customInput;
 			}
 			output.stopReason = options?.signal?.aborted ? "aborted" : "error";
-			output.errorMessage = formatOpenAIResponsesError(error);
+			output.errorMessage = formatProviderError(
+				normalizeProviderError(error),
+				`${model.provider === "openai" ? "OpenAI" : model.provider} API error`,
+			);
 			stream.push({ type: "error", reason: output.stopReason, error: output });
 			stream.end();
 		}