diff --git a/dto/message_reasoning_test.go b/dto/message_reasoning_test.go
deleted file mode 100644
index 630aa943..00000000
--- a/dto/message_reasoning_test.go
+++ /dev/null
@@ -1,104 +0,0 @@
-package dto
-
-import (
-	"testing"
-
-	"github.com/QuantumNous/new-api/common"
-	"github.com/stretchr/testify/require"
-	"github.com/tidwall/gjson"
-)
-
-// TestMessageReasoningContentPreservesEmptyString verifies that an explicitly
-// set empty reasoning_content string survives the JSON round-trip.
-//
-// This is critical for the request-forwarding path (non-passThrough mode):
-// the gateway unmarshals the client request into GeneralOpenAIRequest, then
-// re-marshals it before sending upstream. If Message.ReasoningContent were
-// `string` + `omitempty` (the old type), the empty string would be silently
-// dropped, causing the upstream to never receive the field.
-//
-// With the fix (`*string` + `omitempty`), nil = absent, &"" = explicit empty.
-func TestMessageReasoningContentPreservesEmptyString(t *testing.T) {
-	raw := []byte(`{
-		"role": "assistant",
-		"content": "Hello",
-		"reasoning_content": "",
-		"reasoning": ""
-	}`)
-
-	var msg Message
-	err := common.Unmarshal(raw, &msg)
-	require.NoError(t, err)
-
-	// Pointers must be non-nil: the field was explicitly set to ""
-	require.NotNil(t, msg.ReasoningContent, "reasoning_content should be non-nil when explicitly set to empty string")
-	require.NotNil(t, msg.Reasoning, "reasoning should be non-nil when explicitly set to empty string")
-	require.Equal(t, "", *msg.ReasoningContent)
-	require.Equal(t, "", *msg.Reasoning)
-
-	// Re-marshal — the fields must still be present in the output JSON
-	encoded, err := common.Marshal(msg)
-	require.NoError(t, err)
-
-	require.True(t, gjson.GetBytes(encoded, "reasoning_content").Exists(),
-		"reasoning_content should exist in re-marshaled JSON when explicitly set to empty string")
-	require.True(t, gjson.GetBytes(encoded, "reasoning").Exists(),
-		"reasoning should exist in re-marshaled JSON when explicitly set to empty string")
-	require.Equal(t, "", gjson.GetBytes(encoded, "reasoning_content").String())
-	require.Equal(t, "", gjson.GetBytes(encoded, "reasoning").String())
-}
-
-// TestMessageReasoningContentOmitsAbsentField verifies that when
-// reasoning_content / reasoning are absent from the input JSON, they remain
-// absent after a round-trip (nil pointer → omitted by omitempty).
-func TestMessageReasoningContentOmitsAbsentField(t *testing.T) {
-	raw := []byte(`{
-		"role": "assistant",
-		"content": "Hello"
-	}`)
-
-	var msg Message
-	err := common.Unmarshal(raw, &msg)
-	require.NoError(t, err)
-
-	// Pointers must be nil: the fields were not present in the input
-	require.Nil(t, msg.ReasoningContent)
-	require.Nil(t, msg.Reasoning)
-
-	// Re-marshal — the fields must NOT appear in the output JSON
-	encoded, err := common.Marshal(msg)
-	require.NoError(t, err)
-
-	require.False(t, gjson.GetBytes(encoded, "reasoning_content").Exists(),
-		"reasoning_content should not exist in re-marshaled JSON when absent from input")
-	require.False(t, gjson.GetBytes(encoded, "reasoning").Exists(),
-		"reasoning should not exist in re-marshaled JSON when absent from input")
-}
-
-// TestMessageGetReasoningContent verifies the GetReasoningContent helper
-// method that is used in token-counting code paths.
-func TestMessageGetReasoningContent(t *testing.T) {
-	t.Run("both nil returns empty", func(t *testing.T) {
-		msg := Message{Role: "assistant"}
-		require.Equal(t, "", msg.GetReasoningContent())
-	})
-
-	t.Run("ReasoningContent takes priority", func(t *testing.T) {
-		rc := "thinking..."
-		r := "should be ignored"
-		msg := Message{ReasoningContent: &rc, Reasoning: &r}
-		require.Equal(t, "thinking...", msg.GetReasoningContent())
-	})
-
-	t.Run("falls back to Reasoning when ReasoningContent is nil", func(t *testing.T) {
-		r := "fallback reasoning"
-		msg := Message{Reasoning: &r}
-		require.Equal(t, "fallback reasoning", msg.GetReasoningContent())
-	})
-
-	t.Run("empty string values returned correctly", func(t *testing.T) {
-		empty := ""
-		msg := Message{ReasoningContent: &empty}
-		require.Equal(t, "", msg.GetReasoningContent())
-	})
-}