docs: Update reasoning model settings documentation with compatibility details

aider/website/docs/config/reasoning.md

@@ -8,16 +8,38 @@ description: How to configure reasoning model settings from secondary providers.
 
 ![Thinking demo](/assets/thinking.jpg)
 
-## Reasoning effort
+## Reasoning settings
+
+Different models support different reasoning settings. Aider provides several ways to control reasoning behavior:
+
+### Reasoning effort
 
 You can use the `--reasoning-effort` switch to control the reasoning effort
 of models which support this setting.
 This switch is useful for OpenAI's reasoning models.
 
-You can also use the `--thinking-tokens` switch to request
+### Thinking tokens
+
+You can use the `--thinking-tokens` switch to request
 the model use a certain number of thinking tokens.
 This switch is useful for Sonnet 3.7.
 
+### Model compatibility warnings
+
+Not all models support both settings. Aider will warn you when you use a setting that may not be supported by your chosen model:
+
+```
+Warning: The model claude-3-sonnet@20240229 may not support the 'reasoning_effort' setting.
+Sending unsupported parameters can cause API calls to fail. Continue? [y/N]
+```
+
+You can disable these warnings with the `--no-check-model-accepts-settings` flag.
+
+Each model has a predefined list of supported settings in its configuration. For example:
+
+- OpenAI models generally support `reasoning_effort`
+- Anthropic models (Claude) generally support `thinking_tokens`
+
 
 ## Thinking tokens in XML tags
 
@@ -40,6 +62,18 @@ Aider will display the thinking/reasoning output,
 but it won't be used for file editing instructions, etc.
 Aider will rely on the non-thinking output for instructions on how to make code changes, etc.
 
+### Model-specific reasoning tags
+
+Different models use different XML tags for their reasoning:
+
+| Model | Reasoning Tag |
+|-------|---------------|
+| DeepSeek R1 | `think` |
+| Deepseek V3 | `thinking` |
+| Google Gemini | `reasoning` |
+
+When using custom or self-hosted models, you may need to specify the appropriate reasoning tag in your configuration.
+
 ```yaml
 - name: fireworks_ai/accounts/fireworks/models/deepseek-r1
   edit_format: diff
@@ -55,22 +89,41 @@ Aider will rely on the non-thinking output for instructions on how to make code
 
 ## Reasoning model limitations
 
-Many 
-"reasoning" models have restrictions on how they can be used:
+Many "reasoning" models have restrictions on how they can be used:
 they sometimes prohibit streaming, use of temperature and/or the system prompt.
 
 Aider is configured to work properly with these models
 when served through major provider APIs.
 
-You may need to [configure model settings](/docs/config/adv-model-settings.html)
-if you are using them through another provider
-and see errors related to temperature or system prompt.
+### Model settings compatibility matrix
 
-Include settings for your new provider in `.aider.model.setting.yml` file
+Here's a summary of common reasoning settings compatibility:
+
+| Model Type | `reasoning_effort` | `thinking_tokens` | Notes |
+|------------|-------------------|-------------------|-------|
+| OpenAI reasoning models | ✅ | ❌ | Supports values 0-1 |
+| Claude 3.7+ | ❌ | ✅ | Supports integer values | 
+| Claude 3.0-3.5 | ❌ | ❌ | Uses built-in reasoning |
+| Google Gemini | ❌ | ❌ | Uses built-in reasoning |
+| DeepSeek | ❌ | ❌ | Uses built-in reasoning |
+
+If you're using a model through a different provider (like Azure or custom deployment),
+you may need to [configure model settings](/docs/config/adv-model-settings.html)
+if you see errors related to temperature or system prompt.
+
+Include settings for your new provider in `.aider.model.settings.yml` file
 at the root of your project or in your home directory.
 
 ### Temperature, streaming and system prompt
 
+Reasoning models often have specific requirements for these settings:
+
+| Setting | Description | Common Restrictions |
+|---------|-------------|---------------------|
+| `use_temperature` | Whether to use temperature sampling | Many reasoning models require this set to `false` |
+| `streaming` | Whether to stream responses | Some reasoning models don't support streaming |
+| `use_system_prompt` | Whether to use system prompt | Some reasoning models don't support system prompts |
+
 You should find one of the existing model setting configuration entries
 for the model you are interested in, say o3-mini:
 
@@ -91,8 +144,9 @@ for certain reasoning models:
 - `streaming` 
 - `use_system_prompt`
 
-Here's an example of
-the settings to use o3-mini via Azure.
+### Custom provider example
+
+Here's an example of the settings to use o3-mini via Azure.
 Note that aider already has these settings pre-configured, but they
 serve as a good example of how to adapt the main model
 settings for a different provider.
@@ -106,3 +160,20 @@ settings for a different provider.
   editor_model_name: azure/gpt-4o
   editor_edit_format: editor-diff
 ```
+
+### Accepting settings configuration
+
+Models define which reasoning settings they accept using the `accepts_settings` property:
+
+```yaml
+- name: gpt-4o
+  edit_format: diff
+  weak_model_name: gpt-4o-mini
+  use_repo_map: true
+  editor_model_name: gpt-4o
+  editor_edit_format: editor-diff
+  accepts_settings:                  # <---
+    - reasoning_effort               # <---
+```
+
+This tells Aider that the model accepts the `reasoning_effort` setting but not `thinking_tokens`, which is why you'll get a warning if you try to use `--thinking-tokens` with this model.