diff --git a/sdk/cliproxy/auth/conductor.go b/sdk/cliproxy/auth/conductor.go
index d6d8e229..709f640a 100644
--- a/sdk/cliproxy/auth/conductor.go
+++ b/sdk/cliproxy/auth/conductor.go
@@ -1743,6 +1743,13 @@ func (m *Manager) pickNextMixed(ctx context.Context, providers []string, model s
 	m.mu.RLock()
 	candidates := make([]*Auth, 0, len(m.auths))
 	modelKey := strings.TrimSpace(model)
+	// Always use base model name (without thinking suffix) for auth matching.
+	if modelKey != "" {
+		parsed := thinking.ParseSuffix(modelKey)
+		if parsed.ModelName != "" {
+			modelKey = strings.TrimSpace(parsed.ModelName)
+		}
+	}
 	registryRef := registry.GetGlobalRegistry()
 	for _, candidate := range m.auths {
 		if candidate == nil || candidate.Disabled {