fix(pricing): seed Claude Fable 5.1 / Mythos 5.1 and restore Sonnet 5 to the $2/$10 standard price (#7051)

- Add claude-fable-5-1 / claude-mythos-5-1 pricing rows ($10/$50, cache read $0.25 = 0.025x, cache write $12.50). Without a row these requests were stored at $0: the prefix rule only looks for longer dated ids and cannot fall back to claude-fable-5.
- Sonnet 5: Anthropic's pricing page now states the $2/$10 introductory price is the standard price and the September 1 increase to $3/$15 will not occur. Update the seed and add a repair_current_model_pricing guard so installs seeded at 3/15/0.30/3.75 are corrected; user-customized rows are left alone.
- Tests: seed values for the three rows; the repair guard fixes the old list price and keeps a custom price.

Fixes #7050

src-tauri/src/database/schema.rs

@@ -1604,6 +1604,24 @@ impl Database {
     /// 注意: model_id 使用短横线格式（如 claude-haiku-4-5），与 API 返回的模型名称标准化后一致
     fn seed_model_pricing(conn: &Connection) -> Result<(), AppError> {
         let pricing_data = [
+            // Claude Fable 5.1 / Mythos 5.1（2026-09-01 发布；同 Fable 5 价，
+            // 但缓存读为 0.025x = $0.25，非 Fable 5 的 $1）
+            (
+                "claude-fable-5-1",
+                "Claude Fable 5.1",
+                "10",
+                "50",
+                "0.25",
+                "12.50",
+            ),
+            (
+                "claude-mythos-5-1",
+                "Claude Mythos 5.1",
+                "10",
+                "50",
+                "0.25",
+                "12.50",
+            ),
             // Claude Fable 5（Opus 之上的新档）
             (
                 "claude-fable-5",
@@ -1632,14 +1650,15 @@ impl Database {
                 "0.50",
                 "6.25",
             ),
-            // Claude Sonnet 5（list 价，与 Sonnet 4.6 一致；促销 $2/$10 至 2026-08-31 不入表）
+            // Claude Sonnet 5（官方定价页 2026-09 确认：$2/$10 介绍价转为正式价，
+            // 原定 09-01 涨至 $3/$15 取消）
             (
                 "claude-sonnet-5",
                 "Claude Sonnet 5",
-                "3",
-                "15",
-                "0.30",
-                "3.75",
+                "2",
+                "10",
+                "0.20",
+                "2.50",
             ),
             // Claude 4.7 系列
             (
@@ -2597,6 +2616,20 @@ impl Database {
 
     fn repair_current_model_pricing(conn: &Connection) -> Result<(), AppError> {
         let pricing_fixes = [
+            // 2026-09-02 官方定价页确认 Sonnet 5 $2/$10 介绍价转为正式价、原定 09-01 涨至
+            // $3/$15 取消：早先按 list 价 seed 的行改回正式价（用户手改过的行不匹配旧值，不动）
+            (
+                "claude-sonnet-5",
+                "Claude Sonnet 5",
+                "2",
+                "10",
+                "0.20",
+                "2.50",
+                "3",
+                "15",
+                "0.30",
+                "3.75",
+            ),
             // 2026-08-13 models.dev 审计核价：grok-4.5 的 cached input 官方挂牌为 0.30
             // （docs.x.ai 现行价表），与 grok-4.5-build 的实测计费一致；早先按 0.50
             // 录入的行在此校正。注意 0.50 是 grok-4.6 的 cached 价，勿两者互串

src-tauri/src/database/tests.rs

@@ -892,6 +892,135 @@ fn model_pricing_seed_repairs_known_outdated_builtin_prices() {
     assert_eq!(glm, ("9".to_string(), "9".to_string(), "9".to_string()));
 }
 
+#[test]
+fn model_pricing_seed_includes_claude_5_1_and_standard_sonnet_5_prices() {
+    let db = Database::memory().expect("create memory db");
+    let conn = db.conn.lock().expect("lock conn");
+
+    for model_id in ["claude-fable-5-1", "claude-mythos-5-1"] {
+        let price: (String, String, String, String) = conn
+            .query_row(
+                "SELECT input_cost_per_million, output_cost_per_million,
+                        cache_read_cost_per_million, cache_creation_cost_per_million
+                 FROM model_pricing WHERE model_id = ?1",
+                [model_id],
+                |row| Ok((row.get(0)?, row.get(1)?, row.get(2)?, row.get(3)?)),
+            )
+            .expect("query Fable 5.1 family price");
+        // 缓存读 0.025x = $0.25，不是 Fable 5 的 $1
+        assert_eq!(
+            price,
+            (
+                "10".to_string(),
+                "50".to_string(),
+                "0.25".to_string(),
+                "12.50".to_string(),
+            ),
+            "{model_id}"
+        );
+    }
+
+    let sonnet: (String, String, String, String) = conn
+        .query_row(
+            "SELECT input_cost_per_million, output_cost_per_million,
+                    cache_read_cost_per_million, cache_creation_cost_per_million
+             FROM model_pricing WHERE model_id = 'claude-sonnet-5'",
+            [],
+            |row| Ok((row.get(0)?, row.get(1)?, row.get(2)?, row.get(3)?)),
+        )
+        .expect("query Sonnet 5 price");
+    // $2/$10 介绍价已转为正式价（原定 2026-09-01 涨至 $3/$15 取消）
+    assert_eq!(
+        sonnet,
+        (
+            "2".to_string(),
+            "10".to_string(),
+            "0.20".to_string(),
+            "2.50".to_string(),
+        )
+    );
+}
+
+#[test]
+fn model_pricing_seed_repairs_sonnet_5_list_price_but_keeps_custom_price() {
+    let db = Database::memory().expect("create memory db");
+
+    {
+        let conn = db.conn.lock().expect("lock conn");
+        // 旧 seed 按 list 价录入的行 → 应被修正
+        conn.execute(
+            "UPDATE model_pricing
+             SET input_cost_per_million = '3',
+                 output_cost_per_million = '15',
+                 cache_read_cost_per_million = '0.30',
+                 cache_creation_cost_per_million = '3.75'
+             WHERE model_id = 'claude-sonnet-5'",
+            [],
+        )
+        .expect("restore old Sonnet 5 list price");
+    }
+
+    db.ensure_model_pricing_seeded()
+        .expect("ensure pricing seeded");
+
+    {
+        let conn = db.conn.lock().expect("lock conn");
+        let sonnet: (String, String, String, String) = conn
+            .query_row(
+                "SELECT input_cost_per_million, output_cost_per_million,
+                        cache_read_cost_per_million, cache_creation_cost_per_million
+                 FROM model_pricing WHERE model_id = 'claude-sonnet-5'",
+                [],
+                |row| Ok((row.get(0)?, row.get(1)?, row.get(2)?, row.get(3)?)),
+            )
+            .expect("query repaired Sonnet 5 price");
+        assert_eq!(
+            sonnet,
+            (
+                "2".to_string(),
+                "10".to_string(),
+                "0.20".to_string(),
+                "2.50".to_string(),
+            )
+        );
+
+        // 用户手改过的价（不匹配旧 seed 值）不动
+        conn.execute(
+            "UPDATE model_pricing
+             SET input_cost_per_million = '9',
+                 output_cost_per_million = '9',
+                 cache_read_cost_per_million = '9',
+                 cache_creation_cost_per_million = '9'
+             WHERE model_id = 'claude-sonnet-5'",
+            [],
+        )
+        .expect("set custom Sonnet 5 price");
+    }
+
+    db.ensure_model_pricing_seeded()
+        .expect("ensure pricing seeded again");
+
+    let conn = db.conn.lock().expect("lock conn");
+    let custom: (String, String, String, String) = conn
+        .query_row(
+            "SELECT input_cost_per_million, output_cost_per_million,
+                    cache_read_cost_per_million, cache_creation_cost_per_million
+             FROM model_pricing WHERE model_id = 'claude-sonnet-5'",
+            [],
+            |row| Ok((row.get(0)?, row.get(1)?, row.get(2)?, row.get(3)?)),
+        )
+        .expect("query custom Sonnet 5 price");
+    assert_eq!(
+        custom,
+        (
+            "9".to_string(),
+            "9".to_string(),
+            "9".to_string(),
+            "9".to_string(),
+        )
+    );
+}
+
 #[test]
 fn ensure_incremental_auto_vacuum_rebuilds_existing_file_db() {
     let temp = NamedTempFile::new().expect("create temp db file");