diff --git a/packages/stats/core/src/domain/inference.test.ts b/packages/stats/core/src/domain/inference.test.ts
index d8937ff28e7..ad95dad18b7 100644
--- a/packages/stats/core/src/domain/inference.test.ts
+++ b/packages/stats/core/src/domain/inference.test.ts
@@ -4,6 +4,7 @@ import { modelAuthor, normalizeInferenceModel, statModel, statProvider } from ".
 
 describe("inference stat normalization", () => {
   test("normalizes model suffixes used by router/provider variants", () => {
+    expect(normalizeInferenceModel("GPT-5-Free")).toBe("gpt-5")
     expect(normalizeInferenceModel("deepseek-v4-flash-free")).toBe("deepseek-v4-flash")
     expect(normalizeInferenceModel("deepseek-v4-flash:global")).toBe("deepseek-v4-flash")
     expect(normalizeInferenceModel("mimo-v2.5-free")).toBe("mimo-v2.5")
diff --git a/packages/stats/core/src/domain/model-normalization.ts b/packages/stats/core/src/domain/model-normalization.ts
index 778e5edb8b9..c950fda937a 100644
--- a/packages/stats/core/src/domain/model-normalization.ts
+++ b/packages/stats/core/src/domain/model-normalization.ts
@@ -23,7 +23,7 @@ export const RETIRED_STAT_MODELS = ["big-pickle", ...Object.keys(MODEL_NAME_ALIA
 export const RETIRED_STAT_PROVIDERS = ["opencode"]
 
 export function normalizeInferenceModel(value: string | undefined) {
-  return (value || "unknown").replace(/(-free|:free|:global)+$/, "") || "unknown"
+  return (value || "unknown").toLowerCase().replace(/(-free|:free|:global)+$/, "") || "unknown"
 }
 
 export function modelAuthor(value: string | undefined) {