diff --git a/aigateway/handler/openai.go b/aigateway/handler/openai.go
index ef9d2b5e3..f94b0c769 100644
--- a/aigateway/handler/openai.go
+++ b/aigateway/handler/openai.go
@@ -346,8 +346,15 @@ func (h *OpenAIHandlerImpl) Embedding(c *gin.Context) {
 		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
 		return
 	}
-	if req.Input == "" || req.Model == "" {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "Model and input cannot be empty"})
+	if req.Model == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Model cannot be empty"})
+		return
+	}
+	if req.Input.OfString.String() == "" &&
+		len(req.Input.OfArrayOfStrings) == 0 &&
+		len(req.Input.OfArrayOfTokenArrays) == 0 &&
+		len(req.Input.OfArrayOfTokens) == 0 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Input cannot be empty"})
 		return
 	}
 	modelID := req.Model
@@ -415,7 +422,9 @@ func (h *OpenAIHandlerImpl) Embedding(c *gin.Context) {
 		ImageID:  model.ImageID,
 	})
 	w := NewResponseWriterWrapperEmbedding(c.Writer, tokenCounter)
-	tokenCounter.Input(req.Input)
+	if req.Input.OfString.String() != "" {
+		tokenCounter.Input(req.Input.OfString.Value)
+	}
 
 	rp.ServeHTTP(w, c.Request, "", host)
 	go func() {
diff --git a/aigateway/handler/openai_test.go b/aigateway/handler/openai_test.go
index a26611e16..ffdef7986 100644
--- a/aigateway/handler/openai_test.go
+++ b/aigateway/handler/openai_test.go
@@ -403,8 +403,12 @@ func TestOpenAIHandler_Embedding(t *testing.T) {
 		tester, c, w := setupTest(t)
 		// Empty Input
 		embeddingReq := EmbeddingRequest{
-			Model: "model1:svc1",
-			Input: "",
+			EmbeddingNewParams: openai.EmbeddingNewParams{
+				Model: "model1:svc1",
+				Input: openai.EmbeddingNewParamsInputUnion{
+					OfArrayOfStrings: []string{},
+				},
+			},
 		}
 		body, _ := json.Marshal(embeddingReq)
 		c.Request.Method = http.MethodPost
@@ -424,8 +428,12 @@ func TestOpenAIHandler_Embedding(t *testing.T) {
 		httpbase.SetCurrentUser(c, "testuser")
 		httpbase.SetCurrentUserUUID(c, "testuuid")
 		embeddingReq = EmbeddingRequest{
-			Model: "",
-			Input: "test input",
+			EmbeddingNewParams: openai.EmbeddingNewParams{
+				Model: "",
+				Input: openai.EmbeddingNewParamsInputUnion{
+					OfArrayOfStrings: []string{"test input"},
+				},
+			},
 		}
 		body, _ = json.Marshal(embeddingReq)
 		c.Request.Body = io.NopCloser(bytes.NewReader(body))
@@ -438,8 +446,12 @@ func TestOpenAIHandler_Embedding(t *testing.T) {
 	t.Run("model not found", func(t *testing.T) {
 		tester, c, w := setupTest(t)
 		embeddingReq := EmbeddingRequest{
-			Model: "nonexistent:svc",
-			Input: "test input",
+			EmbeddingNewParams: openai.EmbeddingNewParams{
+				Model: "nonexistent:svc",
+				Input: openai.EmbeddingNewParamsInputUnion{
+					OfArrayOfStrings: []string{"test input"},
+				},
+			},
 		}
 		body, _ := json.Marshal(embeddingReq)
 		c.Request.Method = http.MethodPost
@@ -455,8 +467,12 @@ func TestOpenAIHandler_Embedding(t *testing.T) {
 	t.Run("get model error", func(t *testing.T) {
 		tester, c, w := setupTest(t)
 		embeddingReq := EmbeddingRequest{
-			Model: "model1:svc1",
-			Input: "test input",
+			EmbeddingNewParams: openai.EmbeddingNewParams{
+				Model: "model1:svc1",
+				Input: openai.EmbeddingNewParamsInputUnion{
+					OfArrayOfStrings: []string{"test input"},
+				},
+			},
 		}
 		body, _ := json.Marshal(embeddingReq)
 		c.Request.Method = http.MethodPost
@@ -472,8 +488,12 @@ func TestOpenAIHandler_Embedding(t *testing.T) {
 	t.Run("model not running", func(t *testing.T) {
 		tester, c, w := setupTest(t)
 		embeddingReq := EmbeddingRequest{
-			Model: "model1:svc1",
-			Input: "test input",
+			EmbeddingNewParams: openai.EmbeddingNewParams{
+				Model: "model1:svc1",
+				Input: openai.EmbeddingNewParamsInputUnion{
+					OfArrayOfStrings: []string{"test input"},
+				},
+			},
 		}
 		body, _ := json.Marshal(embeddingReq)
 		c.Request.Method = http.MethodPost
@@ -503,8 +523,12 @@ func TestOpenAIHandler_Embedding(t *testing.T) {
 	t.Run("model without svc name", func(t *testing.T) {
 		tester, c, _ := setupTest(t)
 		embeddingReq := EmbeddingRequest{
-			Model: "model1",
-			Input: "test input",
+			EmbeddingNewParams: openai.EmbeddingNewParams{
+				Model: "model1",
+				Input: openai.EmbeddingNewParamsInputUnion{
+					OfArrayOfStrings: []string{"test input"},
+				},
+			},
 		}
 		body, _ := json.Marshal(embeddingReq)
 		c.Request.Method = http.MethodPost
diff --git a/aigateway/handler/requests.go b/aigateway/handler/requests.go
index 75fc8aef2..dedc072c9 100644
--- a/aigateway/handler/requests.go
+++ b/aigateway/handler/requests.go
@@ -119,7 +119,78 @@ type StreamOptions struct {
 
 // EmbeddingRequest represents an embedding request structure
 type EmbeddingRequest struct {
-	Input          string `json:"input"`                     // Input text content
-	Model          string `json:"model"`                     // Model name used (e.g., "text-embedding-ada-002")
-	EncodingFormat string `json:"encoding_format,omitempty"` // Encoding format (e.g., "float")
+	openai.EmbeddingNewParams
+	// RawJSON stores all unknown fields during unmarshaling
+	RawJSON json.RawMessage `json:"-"`
+}
+
+func (r *EmbeddingRequest) UnmarshalJSON(data []byte) error {
+	// Create a temporary struct to hold the known fields
+	type TempEmbeddingRequest EmbeddingRequest
+
+	// First, unmarshal into the temporary struct
+	var temp TempEmbeddingRequest
+	if err := json.Unmarshal(data, &temp); err != nil {
+		return err
+	}
+
+	// Then, unmarshal into a map to get all fields
+	var allFields map[string]json.RawMessage
+	if err := json.Unmarshal(data, &allFields); err != nil {
+		return err
+	}
+
+	// Remove known fields from the map
+	delete(allFields, "model")
+	delete(allFields, "input")
+	delete(allFields, "encoding_format")
+
+	// If there are any unknown fields left, marshal them into RawJSON
+	var rawJSON []byte
+	var err error
+	if len(allFields) > 0 {
+		rawJSON, err = json.Marshal(allFields)
+		if err != nil {
+			return err
+		}
+	}
+
+	// Assign the temporary struct to the original and set RawJSON
+	*r = EmbeddingRequest(temp)
+	r.RawJSON = rawJSON
+	return nil
+}
+
+func (r EmbeddingRequest) MarshalJSON() ([]byte, error) {
+	// First, marshal the known fields
+	type TempEmbeddingRequest EmbeddingRequest
+	data, err := json.Marshal(TempEmbeddingRequest(r))
+	if err != nil {
+		return nil, err
+	}
+
+	// If there are no raw JSON fields, just return the known fields
+	if len(r.RawJSON) == 0 {
+		return data, nil
+	}
+
+	// Parse the known fields back into a map
+	var knownFields map[string]json.RawMessage
+	if err := json.Unmarshal(data, &knownFields); err != nil {
+		return nil, err
+	}
+
+	// Parse the raw JSON fields into a map
+	var rawFields map[string]json.RawMessage
+	if err := json.Unmarshal(r.RawJSON, &rawFields); err != nil {
+		return nil, err
+	}
+
+	// Merge the raw fields into the known fields
+	for k, v := range rawFields {
+		knownFields[k] = v
+	}
+
+	// Marshal the merged map back into JSON
+	return json.Marshal(knownFields)
 }
diff --git a/aigateway/handler/requests_test.go b/aigateway/handler/requests_test.go
index 8b6d971cb..7ec2f159c 100644
--- a/aigateway/handler/requests_test.go
+++ b/aigateway/handler/requests_test.go
@@ -162,3 +162,70 @@ func TestChatCompletionRequest_EmptyRawJSON(t *testing.T) {
 	// RawJSON should be empty
 	assert.Empty(t, req4Unmarshaled.RawJSON)
 }
+
+func TestEmbeddingRequest_MarshalUnmarshal(t *testing.T) {
+	// Test case 1: Only known fields
+	req1 := &EmbeddingRequest{
+		EmbeddingNewParams: openai.EmbeddingNewParams{
+			Input: openai.EmbeddingNewParamsInputUnion{
+				OfArrayOfStrings: []string{"Hello, world!"},
+			},
+			Model: "text-embedding-ada-002",
+		},
+	}
+
+	// Marshal to JSON
+	data1, err := json.Marshal(req1)
+	assert.NoError(t, err)
+
+	// Unmarshal back
+	var req1Unmarshaled EmbeddingRequest
+	err = json.Unmarshal(data1, &req1Unmarshaled)
+	assert.NoError(t, err)
+
+	// Verify fields
+	assert.Equal(t, req1.Model, req1Unmarshaled.Model)
+	assert.Equal(t, len(req1.Input.OfArrayOfStrings), len(req1Unmarshaled.Input.OfArrayOfStrings))
+	assert.Empty(t, req1Unmarshaled.RawJSON)
+}
+
+func TestEmbeddingRequest_UnknownFields(t *testing.T) {
+	// Test case 2: With unknown fields
+	jsonWithUnknown := `{
+		"model": "text-embedding-ada-002",
+		"input": ["Hello, world!"],
+		"unknown_field": "unknown_value",
+		"another_unknown": 12345
+	}`
+
+	// Unmarshal
+	var req2 EmbeddingRequest
+	err := json.Unmarshal([]byte(jsonWithUnknown), &req2)
+	assert.NoError(t, err)
+
+	// Verify known fields
+	assert.Equal(t, "text-embedding-ada-002", req2.Model)
+	assert.Equal(t, 1, len(req2.Input.OfArrayOfStrings))
+
+	// Verify unknown fields are stored in RawJSON
+	assert.NotEmpty(t, req2.RawJSON)
+
+	// Marshal back and verify unknown fields are preserved
+	data2, err := json.Marshal(req2)
+	assert.NoError(t, err)
+
+	// Unmarshal into map to check all fields
+	var resultMap map[string]interface{}
+	err = json.Unmarshal(data2, &resultMap)
+	assert.NoError(t, err)
+
+	// Check known fields
+	assert.Equal(t, "text-embedding-ada-002", resultMap["model"])
+	inputArray, ok := resultMap["input"].([]interface{})
+	assert.True(t, ok)
+	assert.Equal(t, "Hello, world!", inputArray[0])
+
+	// Check unknown fields
+	assert.Equal(t, "unknown_value", resultMap["unknown_field"])
+	assert.Equal(t, 12345.0, resultMap["another_unknown"])
+}