diff --git a/.github/workflows/evals-nightly.yml b/.github/workflows/evals-nightly.yml
index b7a375d836..6f6767ebfe 100644
--- a/.github/workflows/evals-nightly.yml
+++ b/.github/workflows/evals-nightly.yml
@@ -27,6 +27,7 @@ jobs:
       fail-fast: false
       matrix:
         model:
+          - 'gemini-3.1-pro-preview-customtools'
           - 'gemini-3-pro-preview'
           - 'gemini-3-flash-preview'
           - 'gemini-2.5-pro'