diff --git a/pkg/invoke/invoker.go b/pkg/invoke/invoker.go
index 1b519ec4..d62b4e5a 100644
--- a/pkg/invoke/invoker.go
+++ b/pkg/invoke/invoker.go
@@ -26,7 +26,6 @@ import (
 	"github.com/otto8-ai/otto8/pkg/wait"
 	apierror "k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
-	"k8s.io/apimachinery/pkg/fields"
 	"k8s.io/client-go/util/retry"
 	kclient "sigs.k8s.io/controller-runtime/pkg/client"
 )
@@ -289,32 +288,9 @@ func (i *Invoker) Agent(ctx context.Context, c kclient.WithWatch, agent *v1.Agen
 		}
 	}
 
-	defaultModel := agent.Spec.Manifest.Model
-	if defaultModel == "" {
-		var models v1.ModelList
-		if err := c.List(ctx, &models, &kclient.ListOptions{
-			FieldSelector: fields.SelectorFromSet(map[string]string{
-				"spec.manifest.default": "true",
-			}),
-			Namespace: agent.Namespace,
-		}); err != nil {
-			return nil, err
-		}
-
-		if len(models.Items) > 0 {
-			for _, model := range models.Items {
-				if model.Spec.Manifest.Active {
-					defaultModel = model.Name
-					break
-				}
-			}
-		}
-	}
-
 	return i.createRun(ctx, c, thread, tools, input, runOptions{
 		Synchronous:           opt.Synchronous,
 		AgentName:             agent.Name,
-		DefaultModel:          defaultModel,
 		Env:                   extraEnv,
 		CredentialContextIDs:  credContextIDs,
 		WorkflowStepName:      opt.WorkflowStepName,
@@ -336,7 +312,6 @@ type runOptions struct {
 	ForceNoResume         bool
 	Env                   []string
 	CredentialContextIDs  []string
-	DefaultModel          string
 }
 
 var (
@@ -385,7 +360,7 @@ func (i *Invoker) createRun(ctx context.Context, c kclient.WithWatch, thread *v1
 			Tool:                  string(toolData),
 			Env:                   opts.Env,
 			CredentialContextIDs:  opts.CredentialContextIDs,
-			DefaultModel:          opts.DefaultModel,
+			DefaultModel:          string(types.DefaultModelAliasTypeLLM),
 		},
 	}