diff --git a/genai/embed.go b/genai/embed.go
index cea90ec..a7bd2f5 100644
--- a/genai/embed.go
+++ b/genai/embed.go
@@ -37,7 +37,8 @@ type EmbeddingModel struct {
 	name     string
 	fullName string
 	// TaskType describes how the embedding will be used.
-	TaskType TaskType
+	TaskType        TaskType
+	outputDimension *int32
 }
 
 // Name returns the name of the EmbeddingModel.
@@ -45,6 +46,10 @@ func (m *EmbeddingModel) Name() string {
 	return m.name
 }
 
+func (m *EmbeddingModel) SetOutputDimension(outputDim int32) {
+	m.outputDimension = &outputDim
+}
+
 // EmbedContent returns an embedding for the list of parts.
 func (m *EmbeddingModel) EmbedContent(ctx context.Context, parts ...Part) (*EmbedContentResponse, error) {
 	return m.EmbedContentWithTitle(ctx, "", parts...)
@@ -54,7 +59,7 @@ func (m *EmbeddingModel) EmbedContent(ctx context.Context, parts ...Part) (*Embe
 // If the given title is non-empty, it is passed to the model and
 // the task type is set to TaskTypeRetrievalDocument.
 func (m *EmbeddingModel) EmbedContentWithTitle(ctx context.Context, title string, parts ...Part) (*EmbedContentResponse, error) {
-	req := newEmbedContentRequest(m.fullName, m.TaskType, title, parts)
+	req := newEmbedContentRequest(m.fullName, m.TaskType, title, m.outputDimension, parts)
 	res, err := m.c.gc.EmbedContent(ctx, req)
 	if err != nil {
 		return nil, err
@@ -62,10 +67,11 @@ func (m *EmbeddingModel) EmbedContentWithTitle(ctx context.Context, title string
 	return (EmbedContentResponse{}).fromProto(res), nil
 }
 
-func newEmbedContentRequest(model string, tt TaskType, title string, parts []Part) *pb.EmbedContentRequest {
+func newEmbedContentRequest(model string, tt TaskType, title string, outputDim *int32, parts []Part) *pb.EmbedContentRequest {
 	req := &pb.EmbedContentRequest{
-		Model:   model,
-		Content: NewUserContent(parts...).toProto(),
+		Model:                model,
+		Content:              NewUserContent(parts...).toProto(),
+		OutputDimensionality: outputDim,
 	}
 	// A non-empty title overrides the task type.
 	if title != "" {
@@ -82,8 +88,9 @@ func newEmbedContentRequest(model string, tt TaskType, title string, parts []Par
 
 // An EmbeddingBatch holds a collection of embedding requests.
 type EmbeddingBatch struct {
-	tt  TaskType
-	req *pb.BatchEmbedContentsRequest
+	tt        TaskType
+	req       *pb.BatchEmbedContentsRequest
+	outputDim *int32
 }
 
 // NewBatch returns a new, empty EmbeddingBatch with the same TaskType as the model.
@@ -96,6 +103,7 @@ func (m *EmbeddingModel) NewBatch() *EmbeddingBatch {
 		req: &pb.BatchEmbedContentsRequest{
 			Model: m.fullName,
 		},
+		outputDim: m.outputDimension,
 	}
 }
 
@@ -107,7 +115,7 @@ func (b *EmbeddingBatch) AddContent(parts ...Part) *EmbeddingBatch {
 
 // AddContent adds a content to the batch with a title.
 func (b *EmbeddingBatch) AddContentWithTitle(title string, parts ...Part) *EmbeddingBatch {
-	b.req.Requests = append(b.req.Requests, newEmbedContentRequest(b.req.Model, b.tt, title, parts))
+	b.req.Requests = append(b.req.Requests, newEmbedContentRequest(b.req.Model, b.tt, title, b.outputDim, parts))
 	return b
 }