diff --git a/tests/skill-behavior/README.md b/tests/skill-behavior/README.md
index 01054e417..c9bb5038a 100644
--- a/tests/skill-behavior/README.md
+++ b/tests/skill-behavior/README.md
@@ -90,6 +90,12 @@ Against the current default lineup, two cells are the known floor:
 `redesign replaces DESIGN` is flaky on every model, and `critique closes` is
 flaky on gemini-3.6-flash. A regression is a failure beyond those two.
 
+The Google slot in `DEFAULT_MODELS` moved to `gemini-3.7-flash` on 2026-08-15.
+Every Gemini cell in the tables below was measured on 3.6-flash (or 3.5-flash
+where marked), and per the cross-version rule further down, those results are
+unmeasured on 3.7, not inherited. Re-run the sweep on the next Setup or routing
+change and update the tables to the new column.
+
 **Read any failure against the clock before calling it behavior.** The suite ran
 at a 300s per-test timeout until 2026-08-13, and for the workflow-contract
 scenarios that cap was below the runtime of a correct run. `initialized natural
diff --git a/tests/skill-behavior/providers.mjs b/tests/skill-behavior/providers.mjs
index d6bf0dc8b..9d31e4acf 100644
--- a/tests/skill-behavior/providers.mjs
+++ b/tests/skill-behavior/providers.mjs
@@ -127,7 +127,7 @@ export function getProviderOptions(modelId) {
  * its own floor:
  *   IMPECCABLE_SKILL_BEHAVIOR_MODELS=gpt-5.6-luna,deepseek-v4-flash
  */
-export const DEFAULT_MODELS = ['claude-sonnet-5', 'gpt-5.6-terra', 'gemini-3.6-flash'];
+export const DEFAULT_MODELS = ['claude-sonnet-5', 'gpt-5.6-terra', 'gemini-3.7-flash'];
 
 export function resolveModelList() {
   const override = process.env.IMPECCABLE_SKILL_BEHAVIOR_MODELS;