feat: add openrouter/glm-5.1-precision model

Amp-Thread-ID: https://ampcode.com/threads/T-019daa73-6ce7-7760-89fe-4379b7c990ab
Co-authored-by: Amp <amp@ampcode.com>

pricing.json

@@ -937,12 +937,12 @@
   "openrouter/glm-5.1": {
     "provider": "openrouter",
     "mode": "chat",
-    "input_cost_per_token": 1.4e-6,
-    "output_cost_per_token": 4.4e-6,
+    "input_cost_per_token": 0.0000014,
+    "output_cost_per_token": 0.0000044,
     "max_input_tokens": 202752,
     "max_output_tokens": 131072,
     "max_tokens": 131072,
-    "cache_read_input_token_cost": 2.6e-7,
+    "cache_read_input_token_cost": 2.6E-7,
     "supports_function_calling": true,
     "supports_reasoning": true,
     "supports_response_schema": true,
@@ -1224,7 +1224,6 @@
     "supports_vision": true,
     "supports_web_search": true
   },
-
   "anthropic/claude-haiku-4.5": {
     "provider": "anthropic",
     "mode": "chat",
@@ -1448,5 +1447,19 @@
     "supports_reasoning": true,
     "supports_tool_choice": true,
     "supports_vision": true
+  },
+  "openrouter/glm-5.1-precision": {
+    "provider": "openrouter",
+    "mode": "chat",
+    "input_cost_per_token": 0.0000014,
+    "output_cost_per_token": 0.0000044,
+    "max_input_tokens": 202752,
+    "max_output_tokens": 131072,
+    "max_tokens": 131072,
+    "cache_read_input_token_cost": 2.6E-7,
+    "supports_function_calling": true,
+    "supports_reasoning": true,
+    "supports_response_schema": true,
+    "supports_tool_choice": true
   }
 }