cleanup --model-metadata-file

website/docs/llms/warnings.md

@@ -6,3 +6,38 @@ nav_order: 900
 # Model warnings
 
 {% include model-warnings.md %}
+
+
+## Specifying context window size and token costs
+
+You can register context window limits and costs for models that aren't known
+to aider. Create a `.aider.models.json` file in one of these locations:
+
+- Your home directory.
+- The root if your git repo.
+- The current directory where you launch aider.
+- Or specify a specific file with the `--model-metadata-file <filename>` switch.
+
+
+If the files above exist, they will be loaded in that order. 
+Files loaded last will take priority.
+
+The json file should be a dictionary with an entry for each model, as follows:
+
+```
+{
+    "gpt-4": {
+        "max_tokens": 4096, 
+        "max_input_tokens": 8192,
+        "max_output_tokens": 4096, 
+        "input_cost_per_token": 0.00003,
+        "output_cost_per_token": 0.00006,
+        "litellm_provider": "openai",
+        "mode": "chat",
+        "supports_function_calling": true
+    }
+}
+```
+
+See 
+[litellm's model_prices_and_context_window.json file](https://github.com/BerriAI/litellm/blob/main/model_prices_and_context_window.json) for more examples.