diff --git a/error.go b/error.go
index f68e92875..b2d01e22e 100644
--- a/error.go
+++ b/error.go
@@ -7,12 +7,20 @@ import (
 )
 
 // APIError provides error information returned by the OpenAI API.
+// InnerError struct is only valid for Azure OpenAI Service.
 type APIError struct {
-	Code           any     `json:"code,omitempty"`
-	Message        string  `json:"message"`
-	Param          *string `json:"param,omitempty"`
-	Type           string  `json:"type"`
-	HTTPStatusCode int     `json:"-"`
+	Code           any         `json:"code,omitempty"`
+	Message        string      `json:"message"`
+	Param          *string     `json:"param,omitempty"`
+	Type           string      `json:"type"`
+	HTTPStatusCode int         `json:"-"`
+	InnerError     *InnerError `json:"innererror,omitempty"`
+}
+
+// InnerError Azure Content filtering. Only valid for Azure OpenAI Service.
+type InnerError struct {
+	Code                 string               `json:"code,omitempty"`
+	ContentFilterResults ContentFilterResults `json:"content_filter_result,omitempty"`
 }
 
 // RequestError provides informations about generic request errors.
@@ -61,6 +69,13 @@ func (e *APIError) UnmarshalJSON(data []byte) (err error) {
 		}
 	}
 
+	if _, ok := rawMap["innererror"]; ok {
+		err = json.Unmarshal(rawMap["innererror"], &e.InnerError)
+		if err != nil {
+			return
+		}
+	}
+
 	// optional fields
 	if _, ok := rawMap["param"]; ok {
 		err = json.Unmarshal(rawMap["param"], &e.Param)
diff --git a/error_test.go b/error_test.go
index e2309abd7..a0806b7ed 100644
--- a/error_test.go
+++ b/error_test.go
@@ -3,6 +3,7 @@ package openai_test
 import (
 	"errors"
 	"net/http"
+	"reflect"
 	"testing"
 
 	. "github.com/sashabaranov/go-openai"
@@ -57,6 +58,77 @@ func TestAPIErrorUnmarshalJSON(t *testing.T) {
 				assertAPIErrorMessage(t, apiErr, "")
 			},
 		},
+		{
+			name: "parse succeeds when the innerError is not exists (Azure Openai)",
+			response: `{
+						"message": "test message",
+						"type": null,
+						"param": "prompt",
+						"code": "content_filter",
+						"status": 400,
+						"innererror": {
+							"code": "ResponsibleAIPolicyViolation",
+							"content_filter_result": {
+								"hate": {
+									"filtered": false,
+									"severity": "safe"
+								},
+								"self_harm": {
+									"filtered": false,
+									"severity": "safe"
+								},
+								"sexual": {
+									"filtered": true,
+									"severity": "medium"
+								},
+								"violence": {
+									"filtered": false,
+									"severity": "safe"
+								}
+							}
+						}
+					}`,
+			hasError: false,
+			checkFunc: func(t *testing.T, apiErr APIError) {
+				assertAPIErrorInnerError(t, apiErr, &InnerError{
+					Code: "ResponsibleAIPolicyViolation",
+					ContentFilterResults: ContentFilterResults{
+						Hate: Hate{
+							Filtered: false,
+							Severity: "safe",
+						},
+						SelfHarm: SelfHarm{
+							Filtered: false,
+							Severity: "safe",
+						},
+						Sexual: Sexual{
+							Filtered: true,
+							Severity: "medium",
+						},
+						Violence: Violence{
+							Filtered: false,
+							Severity: "safe",
+						},
+					},
+				})
+			},
+		},
+		{
+			name:     "parse succeeds when the innerError is empty (Azure Openai)",
+			response: `{"message": "","type": null,"param": "","code": "","status": 0,"innererror": {}}`,
+			hasError: false,
+			checkFunc: func(t *testing.T, apiErr APIError) {
+				assertAPIErrorInnerError(t, apiErr, &InnerError{})
+			},
+		},
+		{
+			name:     "parse succeeds when the innerError is not InnerError struct (Azure Openai)",
+			response: `{"message": "","type": null,"param": "","code": "","status": 0,"innererror": "test"}`,
+			hasError: true,
+			checkFunc: func(t *testing.T, apiErr APIError) {
+				assertAPIErrorInnerError(t, apiErr, &InnerError{})
+			},
+		},
 		{
 			name:     "parse failed when the message is object",
 			response: `{"message":{},"type":"invalid_request_error","param":null,"code":null}`,
@@ -152,6 +224,12 @@ func assertAPIErrorMessage(t *testing.T, apiErr APIError, expected string) {
 	}
 }
 
+func assertAPIErrorInnerError(t *testing.T, apiErr APIError, expected interface{}) {
+	if !reflect.DeepEqual(apiErr.InnerError, expected) {
+		t.Errorf("Unexpected APIError InnerError: %v; expected: %v; ", apiErr, expected)
+	}
+}
+
 func assertAPIErrorCode(t *testing.T, apiErr APIError, expected interface{}) {
 	switch v := apiErr.Code.(type) {
 	case int: