diff --git a/packages/provider-pi/src/server/textGeneration.test.ts b/packages/provider-pi/src/server/textGeneration.test.ts
index 0e6a8a3c07780..e1b6c682b7f85 100644
--- a/packages/provider-pi/src/server/textGeneration.test.ts
+++ b/packages/provider-pi/src/server/textGeneration.test.ts
@@ -155,6 +155,22 @@ it.effect("reports Pi's turn error when the reply is empty", () =>
 
     assert.equal(error._tag, "TextGenerationError");
     assert.equal(error.detail, "Pi could not generate text: the model provider returned HTTP 401.");
+
+    // Pi's errorMessage for a 429 from its Gemini and Mistral providers.
+    for (const errorMessage of [
+      '{"error":{"code":429,"message":"Quota exceeded for key AIzaSECRET123","status":"RESOURCE_EXHAUSTED"}}',
+      'Mistral API error (429): {"object":"error","message":"Rate limit exceeded for SECRET123"}',
+    ]) {
+      const providerError = yield* generateCommitMessage([failedTurnWith(errorMessage)]).pipe(
+        Effect.flip,
+      );
+
+      assert.equal(
+        providerError.detail,
+        "Pi could not generate text: the model provider returned HTTP 429.",
+      );
+      assert.notInclude(providerError.message, "SECRET123");
+    }
   }),
 );
 
diff --git a/packages/provider-pi/src/server/textGeneration.ts b/packages/provider-pi/src/server/textGeneration.ts
index 40697f2d4280a..e565c0f2e5c94 100644
--- a/packages/provider-pi/src/server/textGeneration.ts
+++ b/packages/provider-pi/src/server/textGeneration.ts
@@ -16,9 +16,14 @@ const PI_TIMEOUT_MS = 180_000;
 const isTextGenerationError = Schema.is(TextGenerationError);
 
 // Pi's `errorMessage` is the provider's raw response text and can echo
-// credentials, so only a leading HTTP status reaches the error detail.
+// credentials, so only its HTTP status reaches the error detail. Most SDKs lead
+// with it; Mistral's follows "Mistral API error (", and Gemini's is the body's `error.code`.
+const PI_ERROR_STATUS =
+  /^(?:Mistral API error \()?([45]\d\d)\b|^\{"error":\{.*?"code":([45]\d\d)[,}]/;
+
 const piTurnErrorDetail = (errorMessage: string | undefined) => {
-  const status = errorMessage?.match(/^([45]\d\d)\b/)?.[1];
+  const match = errorMessage?.match(PI_ERROR_STATUS);
+  const status = match?.[1] ?? match?.[2];
   return status === undefined
     ? "Pi could not generate text: the model provider reported an error."
     : `Pi could not generate text: the model provider returned HTTP ${status}.`;