fix: update token limits for Claude-4 models and refine reasoning checks in OpenAIProvider

- Adjusted max token limit for 'claude-sonnet-4' and 'claude-opus-4' models from 64000 to 32000.
- Simplified reasoning checks in OpenAIProvider to combine conditions for supported models, enhancing code clarity.

src/renderer/src/config/models.ts

@@ -2617,7 +2617,7 @@ export const THINKING_TOKEN_MAP: Record<string, { min: number; max: number }> =
 
   // Claude models
   'claude-3[.-]7.*sonnet.*$': { min: 1024, max: 64000 },
-  'claude-(:?sonnet|opus)-4.*$': { min: 1024, max: 64000 }
+  'claude-(:?sonnet|opus)-4.*$': { min: 1024, max: 32000 }
 }
 
 export const findTokenLimit = (modelId: string): { min: number; max: number } | undefined => {

src/renderer/src/providers/AiProvider/OpenAIProvider.ts

@@ -281,21 +281,13 @@ export default class OpenAIProvider extends BaseOpenAIProvider {
 
     // OpenRouter models
     if (model.provider === 'openrouter') {
-      if (isSupportedReasoningEffortModel(model)) {
+      if (isSupportedReasoningEffortModel(model) || isSupportedThinkingTokenModel(model)) {
         return {
           reasoning: {
             effort: assistant?.settings?.reasoning_effort
           }
         }
       }
-
-      if (isSupportedThinkingTokenModel(model)) {
-        return {
-          reasoning: {
-            max_tokens: budgetTokens
-          }
-        }
-      }
     }
 
     // Qwen models
@@ -634,7 +626,10 @@ export default class OpenAIProvider extends BaseOpenAIProvider {
 
           if (chunk.choices && chunk.choices.length > 0) {
             const delta = chunk.choices[0]?.delta
-            if (delta?.reasoning_content || delta?.reasoning) {
+            if (
+              (delta?.reasoning_content && delta?.reasoning_content !== '\n') ||
+              (delta?.reasoning && delta?.reasoning !== '\n')
+            ) {
               yield { type: 'reasoning', textDelta: delta.reasoning_content || delta.reasoning }
             }
             if (delta?.content) {