diff --git a/dto/openai_compaction.go b/dto/openai_compaction.go
index f19df09ceb..81a2c63f7b 100644
--- a/dto/openai_compaction.go
+++ b/dto/openai_compaction.go
@@ -9,7 +9,7 @@ import (
 type OpenAIResponsesCompactionResponse struct {
 	ID        string          `json:"id"`
 	Object    string          `json:"object"`
-	CreatedAt int             `json:"created_at"`
+	CreatedAt UnixTimestamp   `json:"created_at"`
 	Output    json.RawMessage `json:"output"`
 	Usage     *Usage          `json:"usage"`
 	Error     any             `json:"error,omitempty"`
diff --git a/dto/openai_response.go b/dto/openai_response.go
index a405b97437..179881baa0 100644
--- a/dto/openai_response.go
+++ b/dto/openai_response.go
@@ -266,7 +266,7 @@ type OutputTokenDetails struct {
 type OpenAIResponsesResponse struct {
 	ID                 string             `json:"id"`
 	Object             string             `json:"object"`
-	CreatedAt          int                `json:"created_at"`
+	CreatedAt          UnixTimestamp      `json:"created_at"`
 	Status             string             `json:"status"`
 	Error              any                `json:"error,omitempty"`
 	IncompleteDetails  *IncompleteDetails `json:"incomplete_details,omitempty"`
diff --git a/dto/values.go b/dto/values.go
index 860d5fae7c..1aa26e1136 100644
--- a/dto/values.go
+++ b/dto/values.go
@@ -1,7 +1,9 @@
 package dto
 
 import (
+	"bytes"
 	"encoding/json"
+	"fmt"
 	"strconv"
 )
 
@@ -29,6 +31,41 @@ func (i IntValue) MarshalJSON() ([]byte, error) {
 	return json.Marshal(int(i))
 }
 
+type UnixTimestamp int64
+
+func (t *UnixTimestamp) UnmarshalJSON(data []byte) error {
+	trimmed := bytes.TrimSpace(data)
+	if len(trimmed) == 0 || bytes.Equal(trimmed, []byte("null")) {
+		return nil
+	}
+	if trimmed[0] == '"' {
+		return fmt.Errorf("timestamp must be json number, got string")
+	}
+
+	var n json.Number
+	if err := json.Unmarshal(trimmed, &n); err != nil {
+		return err
+	}
+	if i, err := n.Int64(); err == nil {
+		*t = UnixTimestamp(i)
+		return nil
+	}
+	f, err := n.Float64()
+	if err != nil {
+		return err
+	}
+	*t = UnixTimestamp(int64(f))
+	return nil
+}
+
+func (t UnixTimestamp) MarshalJSON() ([]byte, error) {
+	return json.Marshal(int64(t))
+}
+
+func (t UnixTimestamp) Int64() int64 {
+	return int64(t)
+}
+
 type BoolValue bool
 
 func (b *BoolValue) UnmarshalJSON(data []byte) error {
diff --git a/dto/values_test.go b/dto/values_test.go
new file mode 100644
index 0000000000..8c8d49b546
--- /dev/null
+++ b/dto/values_test.go
@@ -0,0 +1,61 @@
+package dto
+
+import (
+	"testing"
+
+	"github.com/QuantumNous/new-api/common"
+	"github.com/stretchr/testify/require"
+)
+
+func TestUnixTimestampUnmarshalJSON(t *testing.T) {
+	testCases := []struct {
+		name     string
+		input    string
+		expected int64
+	}{
+		{
+			name:     "integer number",
+			input:    `1768488160`,
+			expected: 1768488160,
+		},
+		{
+			name:     "scientific number",
+			input:    `1.76848816E9`,
+			expected: 1768488160,
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			var ts UnixTimestamp
+			err := common.UnmarshalJsonStr(tc.input, &ts)
+			require.NoError(t, err)
+			require.Equal(t, tc.expected, ts.Int64())
+		})
+	}
+}
+
+func TestUnixTimestampUnmarshalJSONRejectsString(t *testing.T) {
+	var ts UnixTimestamp
+	err := common.UnmarshalJsonStr(`"1768488160"`, &ts)
+	require.Error(t, err)
+}
+
+func TestResponsesStreamResponseCreatedAtScientificNotation(t *testing.T) {
+	payload := `{"response":{"id":"resp_1","created_at":1.76848816E9}}`
+
+	var resp ResponsesStreamResponse
+	err := common.UnmarshalJsonStr(payload, &resp)
+	require.NoError(t, err)
+	require.NotNil(t, resp.Response)
+	require.Equal(t, int64(1768488160), resp.Response.CreatedAt.Int64())
+}
+
+func TestResponsesCompactionResponseCreatedAtScientificNotation(t *testing.T) {
+	payload := `{"id":"resp_1","object":"response","created_at":1.76848816E9}`
+
+	var resp OpenAIResponsesCompactionResponse
+	err := common.UnmarshalJsonStr(payload, &resp)
+	require.NoError(t, err)
+	require.Equal(t, int64(1768488160), resp.CreatedAt.Int64())
+}
diff --git a/relay/channel/openai/chat_via_responses.go b/relay/channel/openai/chat_via_responses.go
index 1aa06473c3..33e5ebc929 100644
--- a/relay/channel/openai/chat_via_responses.go
+++ b/relay/channel/openai/chat_via_responses.go
@@ -314,7 +314,7 @@ func OaiResponsesToChatStreamHandler(c *gin.Context, info *relaycommon.RelayInfo
 					model = streamResp.Response.Model
 				}
 				if streamResp.Response.CreatedAt != 0 {
-					createAt = int64(streamResp.Response.CreatedAt)
+					createAt = streamResp.Response.CreatedAt.Int64()
 				}
 			}
 
@@ -439,7 +439,7 @@ func OaiResponsesToChatStreamHandler(c *gin.Context, info *relaycommon.RelayInfo
 					model = streamResp.Response.Model
 				}
 				if streamResp.Response.CreatedAt != 0 {
-					createAt = int64(streamResp.Response.CreatedAt)
+					createAt = streamResp.Response.CreatedAt.Int64()
 				}
 				if streamResp.Response.Usage != nil {
 					if streamResp.Response.Usage.InputTokens != 0 {