diff --git a/api/migrations/versions/47cc7df8c4f3_modify_default_model_name_length.py b/api/migrations/versions/47cc7df8c4f3_modify_default_model_name_length.py
new file mode 100644
index 0000000000..b37928d3c0
--- /dev/null
+++ b/api/migrations/versions/47cc7df8c4f3_modify_default_model_name_length.py
@@ -0,0 +1,39 @@
+"""modify default model name length
+
+Revision ID: 47cc7df8c4f3
+Revises: 3c7cac9521c6
+Create Date: 2024-05-10 09:48:09.046298
+
+"""
+import sqlalchemy as sa
+from alembic import op
+
+import models as models
+
+# revision identifiers, used by Alembic.
+revision = '47cc7df8c4f3'
+down_revision = '3c7cac9521c6'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    with op.batch_alter_table('tenant_default_models', schema=None) as batch_op:
+        batch_op.alter_column('model_name',
+                              existing_type=sa.VARCHAR(length=40),
+                              type_=sa.String(length=255),
+                              existing_nullable=False)
+
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    with op.batch_alter_table('tenant_default_models', schema=None) as batch_op:
+        batch_op.alter_column('model_name',
+                              existing_type=sa.String(length=255),
+                              type_=sa.VARCHAR(length=40),
+                              existing_nullable=False)
+
+    # ### end Alembic commands ###
diff --git a/api/models/provider.py b/api/models/provider.py
index 413e8f9d67..eb6ec4beb4 100644
--- a/api/models/provider.py
+++ b/api/models/provider.py
@@ -113,7 +113,7 @@ class TenantDefaultModel(db.Model):
     id = db.Column(StringUUID, server_default=db.text('uuid_generate_v4()'))
     tenant_id = db.Column(StringUUID, nullable=False)
     provider_name = db.Column(db.String(40), nullable=False)
-    model_name = db.Column(db.String(40), nullable=False)
+    model_name = db.Column(db.String(255), nullable=False)
     model_type = db.Column(db.String(40), nullable=False)
     created_at = db.Column(db.DateTime, nullable=False, server_default=db.text('CURRENT_TIMESTAMP(0)'))
     updated_at = db.Column(db.DateTime, nullable=False, server_default=db.text('CURRENT_TIMESTAMP(0)'))