diff --git a/VERSION b/VERSION
index 6e8bf73..0ea3a94 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.1.0
+0.2.0
diff --git a/arkruntime/model/images/oas_json_gen.go b/arkruntime/model/images/oas_json_gen.go
index 2e19353..9013235 100644
--- a/arkruntime/model/images/oas_json_gen.go
+++ b/arkruntime/model/images/oas_json_gen.go
@@ -2308,8 +2308,10 @@ func (s *Usage) Encode(e *jx.Encoder) {
 // encodeFields encodes fields.
 func (s *Usage) encodeFields(e *jx.Encoder) {
 	{
-		e.FieldStart("input_images")
-		e.Int64(s.InputImages)
+		if s.InputImages.Set {
+			e.FieldStart("input_images")
+			s.InputImages.Encode(e)
+		}
 	}
 	{
 		e.FieldStart("generated_images")
@@ -2353,11 +2355,9 @@ func (s *Usage) Decode(d *jx.Decoder) error {
 	if err := d.ObjBytes(func(d *jx.Decoder, k []byte) error {
 		switch string(k) {
 		case "input_images":
-			requiredBitSet[0] |= 1 << 0
 			if err := func() error {
-				v, err := d.Int64()
-				s.InputImages = int64(v)
-				if err != nil {
+				s.InputImages.Reset()
+				if err := s.InputImages.Decode(d); err != nil {
 					return err
 				}
 				return nil
@@ -2416,7 +2416,7 @@ func (s *Usage) Decode(d *jx.Decoder) error {
 	// Validate required fields.
 	var failures []validate.FieldError
 	for i, mask := range [1]uint8{
-		0b00000011,
+		0b00000010,
 	} {
 		if result := (requiredBitSet[i] & mask) ^ mask; result != 0 {
 			// Mask only required fields and check equality to mask using XOR.
diff --git a/arkruntime/model/images/oas_schemas_gen.go b/arkruntime/model/images/oas_schemas_gen.go
index 88ee857..2661329 100644
--- a/arkruntime/model/images/oas_schemas_gen.go
+++ b/arkruntime/model/images/oas_schemas_gen.go
@@ -1606,8 +1606,8 @@ func (s *ToolUsage) SetWebSearch(val OptInt64) {
 
 // Ref: #/components/schemas/Usage
 type Usage struct {
-	// Number of reference images supplied by the client.
-	InputImages int64 `json:"input_images"`
+	// Number of reference images supplied by the client. May be absent in responses from older services.
+	InputImages OptInt64 `json:"input_images"`
 	// Number of images returned in `data`.
 	GeneratedImages int64 `json:"generated_images"`
 	// Output tokens consumed (for prompt rewriting / reasoning).
@@ -1619,7 +1619,7 @@ type Usage struct {
 }
 
 // GetInputImages returns the value of InputImages.
-func (s *Usage) GetInputImages() int64 {
+func (s *Usage) GetInputImages() OptInt64 {
 	return s.InputImages
 }
 
@@ -1644,7 +1644,7 @@ func (s *Usage) GetToolUsage() OptToolUsage {
 }
 
 // SetInputImages sets the value of InputImages.
-func (s *Usage) SetInputImages(val int64) {
+func (s *Usage) SetInputImages(val OptInt64) {
 	s.InputImages = val
 }