diff --git a/apps/api/internal/store/rate_limit_policy_migration_integration_test.go b/apps/api/internal/store/rate_limit_policy_migration_integration_test.go
index 4cb8da4..4d8464f 100644
--- a/apps/api/internal/store/rate_limit_policy_migration_integration_test.go
+++ b/apps/api/internal/store/rate_limit_policy_migration_integration_test.go
@@ -118,3 +118,123 @@ WHERE id = '20000000-0000-0000-0000-000000000001'`).Scan(&normalizedPlatformPoli
 		t.Fatalf("normalized platform policy=%s, want={}", normalizedPlatformPolicy)
 	}
 }
+
+func TestRemoveUnconfiguredGPTImageConcurrencyLimitMigration(t *testing.T) {
+	databaseURL := strings.TrimSpace(os.Getenv("AI_GATEWAY_TEST_DATABASE_URL"))
+	if databaseURL == "" {
+		t.Skip("set AI_GATEWAY_TEST_DATABASE_URL to run rate-limit migration PostgreSQL integration tests")
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
+	defer cancel()
+	schema := fmt.Sprintf("remove_gpt_image_limit_%d", time.Now().UnixNano())
+	adminPool, err := pgxpool.New(ctx, databaseURL)
+	if err != nil {
+		t.Fatalf("connect migration test database: %v", err)
+	}
+	defer adminPool.Close()
+	if _, err := adminPool.Exec(ctx, `CREATE SCHEMA `+schema); err != nil {
+		t.Fatalf("create migration test schema: %v", err)
+	}
+	defer adminPool.Exec(context.Background(), `DROP SCHEMA IF EXISTS `+schema+` CASCADE`)
+
+	schemaURL, err := url.Parse(databaseURL)
+	if err != nil {
+		t.Fatalf("parse test database url: %v", err)
+	}
+	query := schemaURL.Query()
+	query.Set("search_path", schema)
+	schemaURL.RawQuery = query.Encode()
+	pool, err := pgxpool.New(ctx, schemaURL.String())
+	if err != nil {
+		t.Fatalf("connect migration test schema: %v", err)
+	}
+	defer pool.Close()
+	if _, err := pool.Exec(ctx, `
+CREATE TABLE base_model_catalog (
+  id uuid PRIMARY KEY,
+  invocation_name text NOT NULL,
+  default_rate_limit_policy jsonb NOT NULL DEFAULT '{}'::jsonb,
+  metadata jsonb NOT NULL DEFAULT '{}'::jsonb,
+  updated_at timestamptz NOT NULL DEFAULT now()
+);
+INSERT INTO base_model_catalog (id, invocation_name, default_rate_limit_policy, metadata) VALUES
+  (
+    '00000000-0000-0000-0000-000000000001',
+    'gpt-image-2',
+    '{"rules":[{"metric":"concurrent","limit":5,"leaseTtlSeconds":300}]}',
+    '{"rateLimitSource":"image-gateway-migration","rateLimitUpdatedAt":"2026-07-24"}'
+  ),
+  (
+    '00000000-0000-0000-0000-000000000002',
+    'gpt-image-2',
+    '{"rules":[{"metric":"concurrent","limit":6,"leaseTtlSeconds":300}]}',
+    '{"rateLimitSource":"image-gateway-migration"}'
+  ),
+  (
+    '00000000-0000-0000-0000-000000000003',
+    'gpt-image-2',
+    '{"rules":[{"metric":"concurrent","limit":5,"leaseTtlSeconds":300}]}',
+    '{"rateLimitSource":"operator"}'
+  ),
+  (
+    '00000000-0000-0000-0000-000000000004',
+    'gemini-3-pro-image',
+    '{"rules":[{"metric":"concurrent","limit":10,"leaseTtlSeconds":600}]}',
+    '{"rateLimitSource":"image-gateway-migration"}'
+  );`); err != nil {
+		t.Fatalf("seed pre-migration rows: %v", err)
+	}
+
+	_, currentFile, _, _ := runtime.Caller(0)
+	migrationPath := filepath.Join(filepath.Dir(currentFile), "..", "..", "migrations", "0082_remove_unconfigured_gpt_image_concurrency_limit.sql")
+	migration, err := os.ReadFile(migrationPath)
+	if err != nil {
+		t.Fatalf("read migration: %v", err)
+	}
+	if _, err := pool.Exec(ctx, string(migration)); err != nil {
+		t.Fatalf("apply migration: %v", err)
+	}
+
+	rows, err := pool.Query(ctx, `
+SELECT id::text, default_rate_limit_policy::text, metadata->>'rateLimitSource',
+       metadata->>'rateLimitRemovalReason'
+FROM base_model_catalog
+ORDER BY id`)
+	if err != nil {
+		t.Fatalf("read migrated rows: %v", err)
+	}
+	defer rows.Close()
+	type result struct {
+		policy        string
+		source        *string
+		removalReason *string
+	}
+	got := make([]result, 0, 4)
+	for rows.Next() {
+		var id string
+		var item result
+		if err := rows.Scan(&id, &item.policy, &item.source, &item.removalReason); err != nil {
+			t.Fatalf("scan migrated row: %v", err)
+		}
+		got = append(got, item)
+	}
+	if err := rows.Err(); err != nil {
+		t.Fatalf("read migrated rows: %v", err)
+	}
+	if len(got) != 4 {
+		t.Fatalf("migrated %d rows, want 4", len(got))
+	}
+	if got[0].policy != "{}" || got[0].source != nil ||
+		got[0].removalReason == nil || *got[0].removalReason != "upstream-limit-unconfigured" {
+		t.Fatalf("migration-owned GPT policy not removed: %+v", got[0])
+	}
+	if got[1].policy == "{}" || got[1].source == nil || *got[1].source != "image-gateway-migration" {
+		t.Fatalf("custom GPT policy was changed: %+v", got[1])
+	}
+	if got[2].policy == "{}" || got[2].source == nil || *got[2].source != "operator" {
+		t.Fatalf("operator GPT policy was changed: %+v", got[2])
+	}
+	if got[3].policy == "{}" || got[3].source == nil || *got[3].source != "image-gateway-migration" {
+		t.Fatalf("Gemini policy was changed: %+v", got[3])
+	}
+}
diff --git a/apps/api/migrations/0082_remove_unconfigured_gpt_image_concurrency_limit.sql b/apps/api/migrations/0082_remove_unconfigured_gpt_image_concurrency_limit.sql
new file mode 100644
index 0000000..b0c0ea3
--- /dev/null
+++ b/apps/api/migrations/0082_remove_unconfigured_gpt_image_concurrency_limit.sql
@@ -0,0 +1,18 @@
+-- gpt-image-2 platforms do not declare an upstream concurrency limit. The
+-- migration-only base default added in 0081 therefore turned an unspecified
+-- limit into an artificial per-platform-model cap of five.
+--
+-- Remove only the exact policy written by 0081. Explicit platform, runtime, or
+-- platform-model policies continue to take precedence and remain untouched.
+UPDATE base_model_catalog
+SET default_rate_limit_policy = '{}'::jsonb,
+    metadata = (COALESCE(metadata, '{}'::jsonb) - 'rateLimitSource' - 'rateLimitUpdatedAt')
+      || jsonb_build_object(
+        'rateLimitRemovedAt', '2026-07-24',
+        'rateLimitRemovalReason', 'upstream-limit-unconfigured'
+      ),
+    updated_at = now()
+WHERE invocation_name = 'gpt-image-2'
+  AND metadata->>'rateLimitSource' = 'image-gateway-migration'
+  AND default_rate_limit_policy =
+    '{"rules":[{"metric":"concurrent","limit":5,"leaseTtlSeconds":300}]}'::jsonb;