diff --git a/packages/core/src/types/prompt_template.d.ts b/packages/core/src/types/prompt_template.d.ts
index 4bd1f7304..4ad900c21 100644
--- a/packages/core/src/types/prompt_template.d.ts
+++ b/packages/core/src/types/prompt_template.d.ts
@@ -157,6 +157,7 @@ type ModelType = OptionsOrString<
     | "huggingface:microsoft/Phi-3-mini-4k-instruct"
     | "jan:llama3.2-3b-instruct"
     | "google:gemini-2.0-flash-exp"
+    | "google:gemini-2.0-flash-thinking-exp-1219"
     | "google:gemini-1.5-flash"
     | "google:gemini-1.5-flash-latest"
     | "google:gemini-1.5-flash-8b"