diff --git a/.github/workflows/pr_agent.yml b/.github/workflows/pr_agent.yml
index 781afead..b7012bd4 100644
--- a/.github/workflows/pr_agent.yml
+++ b/.github/workflows/pr_agent.yml
@@ -21,7 +21,7 @@ jobs:
           PR_REVIEWER.REQUIRE_TESTS_REVIEW: "false"
           OPENAI_KEY: ${{ secrets.OPENAI_KEY }}
           OPENAI_API_BASE: ${{ secrets.OPENAI_API_BASE }}
-          CONFIG.MODEL: "gpt-4o"
-          CONFIG.MODEL_TURBO: "gpt-4o"
+          CONFIG.MODEL: "gpt-5.4-nano"
+          CONFIG.MODEL_TURBO: "gpt-5.4-nano"
           OPENAI.API_BASE: ${{ secrets.OPENAI_API_BASE }}
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 36cfae15..79fee6ff 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -28,8 +28,9 @@
 ### Improvements
 
 - refactor: |Worker| 拆分 `mails_api/index.ts` 与 `admin_api/index.ts`，入口只负责挂路由，业务拆到各自的 `*_api.ts` 文件（`mails_crud.ts` / `new_address.ts` / `parsed_mail_api.ts` / `address_api.ts` / `address_sender_api.ts` / `sendbox_api.ts` / `statistics_api.ts` / `account_settings_api.ts`），保持路径与行为不变
+- chore: |CI| 将 Codium PR Agent 的 `CONFIG.MODEL` 与 `CONFIG.MODEL_TURBO` 调整为 `gpt-5.4-nano`
 
-## v1.7.0(main)
+## v1.7.0
 
 ### Breaking Changes
 
@@ -47,7 +48,7 @@
 
 ### Improvements
 
-## v1.6.0(main)
+## v1.6.0
 
 ### Features
 
@@ -71,7 +72,7 @@
 - docs: |发送邮件| 增强 SMTP_CONFIG 字段说明和多域名示例，新增发信余额机制说明
 - docs: |Email Routing| 补充子域名需单独启用 Email Routing 的说明，避免仅在一级域名开启导致子域收不到邮件（#969）
 
-## v1.5.0(main)
+## v1.5.0
 
 ### Features
 
diff --git a/CHANGELOG_EN.md b/CHANGELOG_EN.md
index 3ea4238d..043fbd8a 100644
--- a/CHANGELOG_EN.md
+++ b/CHANGELOG_EN.md
@@ -28,8 +28,9 @@
 ### Improvements
 
 - refactor: |Worker| Split `mails_api/index.ts` and `admin_api/index.ts` so the index files only wire routes. Business logic moved into dedicated `*_api.ts` files (`mails_crud.ts` / `new_address.ts` / `parsed_mail_api.ts` / `address_api.ts` / `address_sender_api.ts` / `sendbox_api.ts` / `statistics_api.ts` / `account_settings_api.ts`). Paths and behavior unchanged
+- chore: |CI| Change Codium PR Agent `CONFIG.MODEL` and `CONFIG.MODEL_TURBO` to `gpt-5.4-nano`
 
-## v1.7.0(main)
+## v1.7.0
 
 ### Breaking Changes
 
@@ -47,7 +48,7 @@
 
 ### Improvements
 
-## v1.6.0(main)
+## v1.6.0
 
 ### Features
 
@@ -71,7 +72,7 @@
 - docs: |Email Sending| Enhance SMTP_CONFIG field reference and multi-domain examples, add send balance mechanism documentation
 - docs: |Email Routing| Note that subdomains require Email Routing to be enabled separately; enabling it only on the apex domain does not cover subdomains (#969)
 
-## v1.5.0(main)
+## v1.5.0
 
 ### Features