diff --git a/AGENTS.md b/AGENTS.md
new file mode 100644
index 0000000..01a6041
--- /dev/null
+++ b/AGENTS.md
@@ -0,0 +1,5 @@
+# AGENTS.md
+
+- Always reply in Simplified Chinese by default.
+- Use English only if the user explicitly asks for it.
+- Keep code, commands, file paths, logs, and identifiers unchanged.
diff --git a/oh-my-opencode.jsonc b/oh-my-opencode.jsonc
index d9391fc..b4c8233 100644
--- a/oh-my-opencode.jsonc
+++ b/oh-my-opencode.jsonc
@@ -18,11 +18,16 @@
     "ultrabrain": { "model": "openai/gpt-5.4", "variant": "xhigh" },
     "deep": { "model": "openai/gpt-5.3-codex", "variant": "medium" },
     "artistry": { "model": "google/gemini-3.1-pro-preview", "variant": "high" },
-    "quick": { "model": "anthropic/claude-haiku-4-5" },
+    "quick": { "model": "openai/gpt-5.4-mini" },
     "unspecified-low": { "model": "anthropic/claude-sonnet-4-6" },
     "unspecified-high": { "model": "anthropic/claude-opus-4-6", "variant": "high" },
     "writing": { "model": "google/gemini-3-flash-preview" }
   },
+  "experimental": {
+    "dynamic_context_pruning": {
+      "enabled": true
+    }
+  },
   "git_master": {
     "commit_footer": false,
     "include_co_authored_by": false
diff --git a/opencode.jsonc b/opencode.jsonc
index a58487b..12c9c9d 100644
--- a/opencode.jsonc
+++ b/opencode.jsonc
@@ -50,6 +50,12 @@
           "reasoning": true,
           "modalities": { "input": ["text", "image", "pdf"], "output": ["text"] },
           "limit": { "context": 400000, "input": 272000, "output": 128000 }
+        },
+        "gpt-5.4-mini": {
+          "name": "GPT-5.4 mini",
+          "reasoning": true,
+          "modalities": { "input": ["text", "image"], "output": ["text"] },
+          "limit": { "context": 400000, "input": 272000, "output": 128000 }
         }
       }
     },