diff --git a/script/test-cross-model-e2e.sh b/script/test-cross-model-e2e.sh
index 176b532..94843e1 100755
--- a/script/test-cross-model-e2e.sh
+++ b/script/test-cross-model-e2e.sh
@@ -77,7 +77,7 @@ if [ -z "$SID" ]; then
 else
   log_info "Session: $SID"
   log_info "Step 2: Google Claude Opus Thinking + tool..."
-  opencode run -s "$SID" -m google/antigravity-claude-opus-4-5-thinking-low \
+  opencode run -s "$SID" -m google/antigravity-claude-opus-4-6-thinking-low \
     "Run: echo 'Test2-Google-Claude'" \
     > /tmp/e2e-t2-s2.log 2>&1 || true
   
@@ -157,7 +157,7 @@ else
   else
     log_info "Session: $SID"
     log_info "Step 2: Google Claude Sonnet Thinking + tool..."
-    opencode run -s "$SID" -m google/antigravity-claude-sonnet-4-5-thinking-low \
+    opencode run -s "$SID" -m google/antigravity-claude-opus-4-6-thinking-low \
       "Run: echo 'Test5-Google-Claude'" \
       > /tmp/e2e-t5-s2.log 2>&1 || true
     
@@ -190,7 +190,7 @@ else
   check_signature_error /tmp/e2e-t6-s2.log && CHAIN_OK=false
   
   log_info "Turn 3: Google Claude Opus..."
-  opencode run -s "$SID" -m google/antigravity-claude-opus-4-5-thinking-low \
+  opencode run -s "$SID" -m google/antigravity-claude-opus-4-6-thinking-low \
     "Run: echo 'Turn3'" > /tmp/e2e-t6-s3.log 2>&1 || true
   check_signature_error /tmp/e2e-t6-s3.log && CHAIN_OK=false
   
@@ -218,7 +218,7 @@ echo ""
 # Test 7: Google Claude → Anthropic Claude (same family, different API)
 echo "Test 7: Google Claude → Anthropic Claude (same family)"
 log_info "Step 1: Google Claude Sonnet Thinking..."
-opencode run -m google/antigravity-claude-sonnet-4-5-thinking-low \
+opencode run -m google/antigravity-claude-opus-4-6-thinking-low \
   "Run: echo 'Test7-Google-Claude'" \
   > /tmp/e2e-t7-s1.log 2>&1 || true
 
diff --git a/script/test-cross-model.ts b/script/test-cross-model.ts
index 1c85ab1..6c13731 100644
--- a/script/test-cross-model.ts
+++ b/script/test-cross-model.ts
@@ -59,7 +59,7 @@ function runTests(): void {
 
   console.log('Test 1: Model family detection');
   const geminiFamily = getModelFamily('gemini-3-pro-low');
-  const claudeFamily = getModelFamily('claude-opus-4-5-thinking-medium');
+  const claudeFamily = getModelFamily('claude-opus-4-6-thinking-medium');
   if (geminiFamily === 'gemini' && claudeFamily === 'claude') {
     console.log('  ✅ PASS: Model families detected correctly');
     passed++;
@@ -72,7 +72,7 @@ function runTests(): void {
   console.log('  Input: Gemini session with thinking + tool call containing thoughtSignature');
   
   const result = sanitizeCrossModelPayload(geminiHistoryWithThinkingAndToolCall, {
-    targetModel: 'claude-opus-4-5-thinking-medium'
+    targetModel: 'claude-opus-4-6-thinking-medium'
   });
 
   const payload = result.payload as any;
diff --git a/script/test-models.ts b/script/test-models.ts
index 9533479..14cbbc8 100644
--- a/script/test-models.ts
+++ b/script/test-models.ts
@@ -20,13 +20,13 @@ const MODELS: ModelTest[] = [
 
   // Antigravity Claude
   { model: "google/antigravity-claude-sonnet-4-6", category: "antigravity-claude" },
-  { model: "google/antigravity-claude-sonnet-4-5", category: "antigravity-claude" },
-  { model: "google/antigravity-claude-sonnet-4-5-thinking-low", category: "antigravity-claude" },
-  { model: "google/antigravity-claude-sonnet-4-5-thinking-medium", category: "antigravity-claude" },
-  { model: "google/antigravity-claude-sonnet-4-5-thinking-high", category: "antigravity-claude" },
-  { model: "google/antigravity-claude-opus-4-5-thinking-low", category: "antigravity-claude" },
-  { model: "google/antigravity-claude-opus-4-5-thinking-medium", category: "antigravity-claude" },
-  { model: "google/antigravity-claude-opus-4-5-thinking-high", category: "antigravity-claude" },
+  { model: "google/antigravity-claude-sonnet-4-6", category: "antigravity-claude" },
+  { model: "google/antigravity-claude-opus-4-6-thinking-low", category: "antigravity-claude" },
+  { model: "google/antigravity-claude-opus-4-6-thinking-medium", category: "antigravity-claude" },
+  { model: "google/antigravity-claude-opus-4-6-thinking-high", category: "antigravity-claude" },
+  { model: "google/antigravity-claude-opus-4-6-thinking-low", category: "antigravity-claude" },
+  { model: "google/antigravity-claude-opus-4-6-thinking-medium", category: "antigravity-claude" },
+  { model: "google/antigravity-claude-opus-4-6-thinking-high", category: "antigravity-claude" },
   { model: "google/antigravity-claude-opus-4-6-thinking-low", category: "antigravity-claude" },
   { model: "google/antigravity-claude-opus-4-6-thinking-medium", category: "antigravity-claude" },
   { model: "google/antigravity-claude-opus-4-6-thinking-high", category: "antigravity-claude" },
diff --git a/script/test-regression.ts b/script/test-regression.ts
index 1792ca1..c7fb572 100644
--- a/script/test-regression.ts
+++ b/script/test-regression.ts
@@ -54,8 +54,8 @@ const ERROR_PATTERNS = [
 
 const GEMINI_FLASH = "google/antigravity-gemini-3-flash";
 const GEMINI_FLASH_CLI_QUOTA = "google/gemini-2.5-flash";
-const CLAUDE_SONNET = "google/antigravity-claude-sonnet-4-5-thinking-low";
-const CLAUDE_OPUS = "google/antigravity-claude-opus-4-5-thinking-low";
+const CLAUDE_SONNET = "google/antigravity-claude-opus-4-6-thinking-low";
+const CLAUDE_OPUS = "google/antigravity-claude-opus-4-6-thinking-low";
 
 const SANITY_TESTS: MultiTurnTest[] = [
   {